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< 1 2 3 4 >Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 1084 | Tick, Tock | 2-sat combinatorics dfs and similar dsu graphs | Statement | E | Codeforces Round 836 (Div. 2) {1758} | PROGRAMMING | 2250.0 | Codeforces Round #836 (Div. 2) Editorial | |
| 2893 | Carry Bit | bitmasks brute force combinatorics dp math | Statement | D | Pinely Round 1 (Div. 1 + Div. 2) {1761} | PROGRAMMING | 1750.0 | Pinely Round 1 (Div. 1 + Div. 2) Editorial | |
| 112 | Anti-median (Hard Version) | combinatorics dp math | Statement | F2 | Pinely Round 1 (Div. 1 + Div. 2) {1761} | PROGRAMMING | 2000.0 | Pinely Round 1 (Div. 1 + Div. 2) Editorial | |
| 10254 | Binary Strings are Fun | combinatorics dp | Statement | C | Codeforces Round 838 (Div. 2) {1762} | PROGRAMMING | 1750.0 | Codeforces Round #838 (Div. 2) Editorial | |
| 984 | Tree Sum | combinatorics trees | Statement | E | Codeforces Round 838 (Div. 2) {1762} | PROGRAMMING | 2500.0 | Codeforces Round #838 (Div. 2) Editorial | |
| 2418 | Valid Bitonic Permutations | combinatorics dp implementation math | Statement | D | Codeforces Round 840 (Div. 2) and Enigma 2022 - Cybros LNMIIT {1763} | PROGRAMMING | 2000.0 | Codeforces Round #840 (Div. 2) and Enigma 2022 — Cybros LNMIIT Editorial | |
| 3246 | Doremy's Pegging Game | combinatorics geometry math | Statement | D | Codeforces Global Round 24 {1764} | PROGRAMMING | 1750.0 | Codeforces Global Round 24 Editorial | |
| 11398 | Playoff | combinatorics constructive algorithms dp graphs greedy | Statement | D | Educational Codeforces Round 140 (Rated for Div. 2) {1767} | PROGRAMMING | 110225 | ||
| 2381 | Partial Sorting | combinatorics fft math number theory | Statement | E | Codeforces Round 842 (Div. 2) {1768} | PROGRAMMING | 2250.0 | Codeforces Round #842 (Div. 2) Editorial | |
| 1105 | Koxia and Sequence | bitmasks combinatorics math | Statement | F | Good Bye 2022: 2023 is NEAR {1770} | PROGRAMMING | 2500.0 | Good Bye 2022 -- Editorial | |
| 1655 | Koxia and Tree | combinatorics dp math probabilities trees | Statement | E | Good Bye 2022: 2023 is NEAR {1770} | PROGRAMMING | 2000.0 | Good Bye 2022 -- Editorial | |
| 25747 | Hossam and Combinatorics | combinatorics math sortings | Statement | A | Codeforces Round 837 (Div. 2) {1771} | PROGRAMMING | 500.0 | Codeforces Round #837 (Div. 2) Editorial | |
| 710 | Segment Covering | brute force combinatorics constructive algorithms data structures trees | Statement | G | Polynomial Round 2022 (Div. 1 + Div. 2, Rated, Prizes!) {1774} | PROGRAMMING | 3250.0 | Polynomial Round 2022 (Div. 1 + Div. 2) Editorial | |
| 925 | Laboratory on Pluto | brute force combinatorics dp fft greedy math | Statement | F | Codeforces Round 843 (Div. 2) {1775} | PROGRAMMING | 3000.0 | Codeforces Round #843 (Div. 2) Editorial | |
| 2468 | Another Wine Tasting Event | combinatorics constructive algorithms strings | Statement | G | SWERC 2022-2023 - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1776} | PROGRAMMING | |||
| 4974 | Score of a Tree | bitmasks combinatorics dfs and similar dp probabilities trees | Statement | D | Codeforces Round 845 (Div. 2) and ByteRace 2023 {1777} | PROGRAMMING | 2000.0 | Codeforces Round #845 (Div. 2) and ByteRace 2023 Editorial | |
| 3600 | Flexible String Revisit | combinatorics dp math probabilities | Statement | D | Codeforces Round 848 (Div. 2) {1778} | PROGRAMMING | 1750.0 | Codeforces Round #848 (Div. 2) Editorial | |
| 2003 | Three Chairs | bitmasks brute force combinatorics data structures number theory sortings | Statement | F | Codeforces Round 846 (Div. 2) {1780} | PROGRAMMING | 2000.0 | 111841 | |
| 1390 | Bracket Insertion | brute force combinatorics constructive algorithms dp math trees | Statement | F | VK Cup 2022 - Отборочный раунд (Engine) {1781} | PROGRAMMING | 3250.0 | Tutorial | |
| 1423 | Wooden Spoon | combinatorics dp | Statement | D | VK Cup 2022 - Финальный раунд (Engine) {1784} | PROGRAMMING | 2000.0 | Codeforces Round #850 Editorial | |
| 511 | Infinite Game | combinatorics dp games probabilities | Statement | E | VK Cup 2022 - Финальный раунд (Engine) {1784} | PROGRAMMING | 3000.0 | Codeforces Round #850 Editorial | |
| 3877 | Game on Axis | combinatorics dsu graphs implementation | Statement | D | TypeDB Forces 2023 (Div. 1 + Div. 2, Rated, Prizes!) {1787} | PROGRAMMING | 2000.0 | TypeDB Forces 2023 (Div. 1 + Div. 2, Rated, Prizes!) Editorial | |
| 4806 | Moving Dots | binary search brute force combinatorics dp math two pointers | Statement | D | Codeforces Round 851 (Div. 2) {1788} | PROGRAMMING | 2250.0 | Codeforces Round #851 (Div. 2) Editorial | |
| 1010 | Serval and Music Game | brute force combinatorics implementation math number theory | Statement | E | Codeforces Round 853 (Div. 2) {1789} | PROGRAMMING | 2000.0 | Codeforces Round #853 (Div. 2) Editorial | |
| 10110 | Serval and Toxel's Arrays | combinatorics implementation math | Statement | C | Codeforces Round 853 (Div. 2) {1789} | PROGRAMMING | 1250.0 | Codeforces Round #853 (Div. 2) Editorial | |
| 4676 | Counting Factorizations | combinatorics dp math number theory | Statement | D | Codeforces Round 856 (Div. 2) {1794} | PROGRAMMING | 2000.0 | Codeforces Round 856 (Div. 2) Editorial | |
| 14003 | Triangle Coloring | combinatorics math | Statement | D | Educational Codeforces Round 143 (Rated for Div. 2) {1795} | PROGRAMMING | 112963 | ||
| 12438 | Maximum Set | binary search brute force combinatorics dp math | Statement | C | Educational Codeforces Round 144 (Rated for Div. 2) {1796} | PROGRAMMING | Educational Codeforces Round 144 Editorial | ||
| 1126 | Count Voting | combinatorics dp math | Statement | G | Codeforces Round 854 by cybercats (Div. 1 + Div. 2) {1799} | PROGRAMMING | 3000.0 | Codeforces Round #854 Editorial | |
| 1287 | DSU Master | combinatorics dp dsu math | Statement | D | Codeforces Round 858 (Div. 2) {1806} | PROGRAMMING | 2000.0 | Codeforces Round #858 (Div. 2) Editorial | |
| 1655 | Minibuses on Venus (easy version) | brute force combinatorics dp | Statement | E1 | Codeforces Round 861 (Div. 2) {1808} | PROGRAMMING | 1750.0 | Codeforces Round #861 (Div. 2) editorial | 2200 |
| 898 | Minibuses on Venus (medium version) | combinatorics divide and conquer dp matrices | Statement | E2 | Codeforces Round 861 (Div. 2) {1808} | PROGRAMMING | 1000.0 | Codeforces Round #861 (Div. 2) editorial | 2500 |
| 664 | Minibuses on Venus (hard version) | brute force combinatorics dp math | Statement | E3 | Codeforces Round 861 (Div. 2) {1808} | PROGRAMMING | 750.0 | Codeforces Round #861 (Div. 2) editorial | 2800 |
| 682 | Prediction | combinatorics data structures dp | Statement | G | Educational Codeforces Round 145 (Rated for Div. 2) {1809} | PROGRAMMING | 114300 | ||
| 2226 | Vlad and the Nice Paths (hard version) | binary search combinatorics data structures dp math two pointers | Statement | G2 | Codeforces Round 863 (Div. 3) {1811} | PROGRAMMING | 114788 | ||
| 2622 | Vlad and the Nice Paths (easy version) | combinatorics dp math | Statement | G1 | Codeforces Round 863 (Div. 3) {1811} | PROGRAMMING | 114788 | ||
| 1567 | XOR Counting | bitmasks combinatorics dp math | Statement | D | Codeforces Round 865 (Div. 1) {1815} | PROGRAMMING | 2500.0 | Editorial of Codeforces Round #865 | 2600 |
| 1025 | Timber | combinatorics dp fft math | Statement | F | Educational Codeforces Round 147 (Rated for Div. 2) {1821} | PROGRAMMING | 115296 | ||
| 21418 | Matching | combinatorics math | Statement | A | Educational Codeforces Round 147 (Rated for Div. 2) {1821} | PROGRAMMING | 115296 | ||
| 17333 | A-characteristic | combinatorics constructive algorithms math | Statement | A | Codeforces Round 868 (Div. 2) {1823} | PROGRAMMING | 500.0 | 115465 | |
| 6388 | LuoTianyi and the Floating Islands (Easy Version) | combinatorics math probabilities trees | Statement | B1 | Codeforces Round 872 (Div. 1) {1824} | PROGRAMMING | 500.0 | CodeForces Round 872(Div. 1&2) Editorial | 1800 |
| 3617 | LuoTianyi and the Floating Islands (Hard Version) | combinatorics dfs and similar math probabilities trees | Statement | B2 | Codeforces Round 872 (Div. 1) {1824} | PROGRAMMING | 750.0 | CodeForces Round 872(Div. 1&2) Editorial | 2300 |
| 31354 | Counting Orders | combinatorics math sortings two pointers | Statement | A | Codeforces Round 873 (Div. 1) {1827} | PROGRAMMING | 500.0 | Codeforces Round #873 (Div. 1 & 2) Editorial | 1100 |
| 11463 | Don't Blame Me | bitmasks combinatorics dp math | Statement | H | Codeforces Round 871 (Div. 4) {1829} | PROGRAMMING | Codeforces Round 871 (Div. 4) Editorial | 1700 | |
| 2353 | Hyperregular Bracket Strings | combinatorics hashing number theory sortings two pointers | Statement | C | Codeforces Round 875 (Div. 1) {1830} | PROGRAMMING | 1750.0 | Codeforces Round #875 (Div.1 + Div. 2) Editorial | |
| 2649 | Combinatorics Problem | brute force combinatorics dp | Statement | E | Educational Codeforces Round 148 (Rated for Div. 2) {1832} | PROGRAMMING | 116454 | 2200 | |
| 10754 | Ira and Flamenco | combinatorics data structures implementation sortings | Statement | F | Codeforces Round 874 (Div. 3) {1833} | PROGRAMMING | 116636 | ||
| 2587 | Playoff Fixing | combinatorics trees | Statement | E | Educational Codeforces Round 149 (Rated for Div. 2) {1837} | PROGRAMMING | 116752 | ||
| 1955 | Count Supersequences | combinatorics dp math | Statement | E | Codeforces Round 877 (Div. 2) {1838} | PROGRAMMING | 2250.0 | Codeforces Round #877 (Div. 2) Editorial | |
| 25080 | Binary Cafe | bitmasks combinatorics math | Statement | B | Codeforces Round 878 (Div. 3) {1840} | PROGRAMMING | Codeforces Round #878 (Div.3) Editorial | ||
| 52452 | Ski Resort | combinatorics math two pointers | Statement | C | Codeforces Round 878 (Div. 3) {1840} | PROGRAMMING | Codeforces Round #878 (Div.3) Editorial | ||
| 1786 | Tenzing and Random Operations | combinatorics dp math probabilities | Statement | G | CodeTON Round 5 (Div. 1 + Div. 2, Rated, Prizes!) {1842} | PROGRAMMING | 3000.0 | CodeTON Round 5 Editorial | |
| 22481 | Apple Tree | combinatorics dfs and similar dp trees | Statement | D | Codeforces Round 881 (Div. 3) {1843} | PROGRAMMING | Codeforces Round #881 (Div. 3) Editorial | ||
| 312 | Multiple of Three Cycles | combinatorics dp dsu math | Statement | H | Codeforces Round 884 (Div. 1 + Div. 2) {1844} | PROGRAMMING | 4000.0 | Codeforces Round #884 (Div. 1 + Div. 2) Editorial | |
| 2154 | Vika and Wiki | binary search bitmasks combinatorics math | Statement | F | Codeforces Round 885 (Div. 2) {1848} | PROGRAMMING | 2750.0 | Codeforces Round #885 (Div.2) Editorial | |
| 15896 | The Morning Star | combinatorics data structures geometry implementation math sortings | Statement | G | Codeforces Round 886 (Div. 4) {1850} | PROGRAMMING | Codeforces Round #886 (Div. 4) Editorial | ||
| 49606 | Longest Divisors Interval | brute force combinatorics greedy math number theory | Statement | B | Codeforces Round 889 (Div. 2) {1855} | PROGRAMMING | 1000.0 | Editorial of Codeforces Round 889 (Div. 1 + Div. 2) | |
| 5706 | Counting Graphs | combinatorics divide and conquer dsu graphs greedy sortings | Statement | G | Codeforces Round 891 (Div. 3) {1857} | PROGRAMMING | 119134 | ||
| 2115 | Non-Intersecting Subpermutations | combinatorics dp | Statement | E | Educational Codeforces Round 154 (Rated for Div. 2) {1861} | PROGRAMMING | Educational Codeforces Round 154 Editorial | ||
| 20352 | Ice Cream Balls | binary search combinatorics constructive algorithms math | Statement | D | Codeforces Round 894 (Div. 3) {1862} | PROGRAMMING | Tutorial | ||
| 1068 | Swaps | combinatorics graphs | Statement | G | Pinely Round 2 (Div. 1 + Div. 2) {1863} | PROGRAMMING | 2750.0 | ||
| 3139 | Guess Game | bitmasks combinatorics constructive algorithms data structures games math probabilities strings trees | Statement | E | Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) {1864} | PROGRAMMING | 2000.0 | Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) Editorial | |
| 403 | Magic Square | combinatorics constructive algorithms | Statement | G | Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) {1864} | PROGRAMMING | 3000.0 | Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) Editorial | |
| 1956 | Happy Sets | combinatorics | Statement | H | COMPFEST 15 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1866} | PROGRAMMING | COMPFEST 15 Preliminary — Editorial | ||
| 1015 | Mighty Rock Tower | combinatorics dp math probabilities | Statement | M | COMPFEST 15 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1866} | PROGRAMMING | COMPFEST 15 Preliminary — Editorial | ||
| 9481 | Battling with Numbers | combinatorics math number theory | Statement | B | COMPFEST 15 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1866} | PROGRAMMING | COMPFEST 15 Preliminary — Editorial | ||
| 1412 | Travel Plan | combinatorics divide and conquer dp math trees | Statement | C | Codeforces Round 896 (Div. 1) {1868} | PROGRAMMING | 1000.0 | Codeforces Round 896 (Div. 1, Div. 2) Editorial | |
| 1109 | Lexichromatography | combinatorics dfs and similar dsu graphs two pointers | Statement | D | Codeforces Round 902 (Div. 1, based on COMPFEST 15 - Final Round) {1876} | PROGRAMMING | 1750.0 | Codeforces Round #902 (Div. 1, Div. 2, based on COMPFEST 15 — Final Round) Editorial | |
| 10318 | Effects of Anti Pimples | combinatorics number theory sortings | Statement | B | Codeforces Round 902 (Div. 1, based on COMPFEST 15 - Final Round) {1876} | PROGRAMMING | 1000.0 | Codeforces Round #902 (Div. 1, Div. 2, based on COMPFEST 15 — Final Round) Editorial | |
| 29497 | Make it Alternating | combinatorics dp greedy | Statement | C | Educational Codeforces Round 155 (Rated for Div. 2) {1879} | PROGRAMMING | 120773 | 1300 | |
| 11254 | Sum of XOR Functions | bitmasks combinatorics dp | Statement | D | Educational Codeforces Round 155 (Rated for Div. 2) {1879} | PROGRAMMING | 120773 | 1700 | |
| 4328 | Counting Rhyme | brute force combinatorics dp math number theory sortings | Statement | D | Codeforces Round 904 (Div. 2) {1884} | PROGRAMMING | 2500.0 | Codeforces Round #904 (Div. 2) Editorial | |
| 4279 | Monocarp and the Set | brute force combinatorics math | Statement | D | Educational Codeforces Round 156 (Rated for Div. 2) {1886} | PROGRAMMING | Educational Codeforces Round 156 Editorial | ||
| 387 | Cacti Symphony | combinatorics dfs and similar dp graphs | Statement | E | Codeforces Round 908 (Div. 1) {1893} | PROGRAMMING | 2750.0 | Codeforces Round 908 (Div. 1, Div, 2) Editorial | |
| 1110 | Fancy Arrays | combinatorics math matrices | Statement | F | Educational Codeforces Round 157 (Rated for Div. 2) {1895} | PROGRAMMING | Educational Codeforces Round 157 Editorial | ||
| 20946 | Laura and Operations | dp math | Statement | B | Codeforces Round 911 (Div. 2) {1900} | PROGRAMMING | 1000.0 | Codeforces Round 911 (Div. 2) Editorial | |
| 1336 | One-X | combinatorics dp math | Statement | E | Codeforces Round 915 (Div. 2) {1905} | PROGRAMMING | 2250.0 | Codeforces Round 915 (Div. 2) Editorial | |
| 1147 | Twin Friends | combinatorics dp | Statement | H | 2023-2024 ICPC, Asia Jakarta Regional Contest (Online Mirror, Unrated, ICPC Rules, Teams Preferred) {1906} | PROGRAMMING | problem_analysis.pdf | ||
| 1150 | Count BFS Graph | combinatorics dp | Statement | J | 2023-2024 ICPC, Asia Jakarta Regional Contest (Online Mirror, Unrated, ICPC Rules, Teams Preferred) {1906} | PROGRAMMING | problem_analysis.pdf | ||
| 17005 | Good Triples | brute force combinatorics number theory | Statement | E | Codeforces Round 913 (Div. 3) {1907} | PROGRAMMING | Codeforces Round 913 (Div. 3) Editorial | ||
| 183 | Short Permutation Problem | combinatorics dp fft math | Statement | I | Pinely Round 3 (Div. 1 + Div. 2) {1909} | PROGRAMMING | 6000.0 | Editorial of Pinely Round 3 (Div. 1 + Div. 2) | |
| 2324 | Small Permutation Problem (Easy Version) | combinatorics dp math | Statement | F1 | Pinely Round 3 (Div. 1 + Div. 2) {1909} | PROGRAMMING | 1500.0 | Editorial of Pinely Round 3 (Div. 1 + Div. 2) | |
| 1293 | Small Permutation Problem (Hard Version) | combinatorics dp math | Statement | F2 | Pinely Round 3 (Div. 1 + Div. 2) {1909} | PROGRAMMING | 1500.0 | Editorial of Pinely Round 3 (Div. 1 + Div. 2) | |
| 70 | Inverse Problem | *special combinatorics dp | Statement | I | Kotlin Heroes: Episode 9 (Unrated, T-Shirts + Prizes!) {1910} | PROGRAMMING | 123261 | ||
| 4590 | Kim's Quest | bitmasks combinatorics dp | Statement | K | 2023-2024 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1912} | PROGRAMMING | Tutorials (PDF) | 1800 | |
| 1481 | Blueprint for Seating | combinatorics divide and conquer fft math | Statement | B | 2023-2024 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1912} | PROGRAMMING | Tutorials (PDF) | 2000 | |
| 2488 | Light Bulbs (Easy Version) | brute force combinatorics dfs and similar dp dsu graphs math | Statement | G1 | Codeforces Round 916 (Div. 3) {1914} | PROGRAMMING | Codeforces Round 916 (Div. 3) Editorial | ||
| 1912 | Light Bulbs (Hard Version) | combinatorics data structures dfs and similar dp dsu graphs hashing | Statement | G2 | Codeforces Round 916 (Div. 3) {1914} | PROGRAMMING | Codeforces Round 916 (Div. 3) Editorial | ||
| 755 | Matrix Rank (Easy Version) | brute force combinatorics dp math matrices | Statement | H1 | Good Bye 2023 {1916} | PROGRAMMING | 2750.0 | ||
| 687 | Matrix Rank (Hard Version) | combinatorics dp math matrices | Statement | H2 | Good Bye 2023 {1916} | PROGRAMMING | 1750.0 | ||
| 2120 | Yet Another Inversions Problem | bitmasks combinatorics data structures math | Statement | D | Codeforces Round 917 (Div. 2) {1917} | PROGRAMMING | 2250.0 | Editorial of Codeforces Round 917 (Div. 2) | |
| 39777 | Erase First or Second Letter | brute force combinatorics dp strings | Statement | B | Codeforces Round 917 (Div. 2) {1917} | PROGRAMMING | 1000.0 | Editorial of Codeforces Round 917 (Div. 2) | |
| 1181 | Counting Prefixes | combinatorics dp math | Statement | E | Hello 2024 {1919} | PROGRAMMING | 2250.0 | 2600 | |
| 3527 | Counting Binary Strings | combinatorics dp math strings | Statement | E | Codeforces Round 919 (Div. 2) {1920} | PROGRAMMING | 2250.0 | Editorial for Codeforces Round #919 (Div. 2) | |
| 23783 | Forming Triangles | combinatorics implementation math | Statement | B | Educational Codeforces Round 161 (Rated for Div. 2) {1922} | PROGRAMMING | Educational Codeforces Round 161 Editorial | ||
| 1561 | Balanced Subsequences | combinatorics dp math | Statement | D | Codeforces Round 921 (Div. 1) {1924} | PROGRAMMING | 1750.0 | Codeforces Round 921 (Div. 1, Div. 2) Editorial | |
| 1416 | Fractal Origami | combinatorics geometry math matrices | Statement | C | Codeforces Round 921 (Div. 1) {1924} | PROGRAMMING | 1500.0 | Codeforces Round 921 (Div. 1, Div. 2) Editorial | |
| 652 | Paper Cutting Again | combinatorics probabilities | Statement | E | Codeforces Round 921 (Div. 1) {1924} | PROGRAMMING | 2500.0 | Codeforces Round 921 (Div. 1, Div. 2) Editorial | |
| 5032 | Good Trip | combinatorics dp math probabilities | Statement | D | Codeforces Round 921 (Div. 2) {1925} | PROGRAMMING | 1750.0 | Codeforces Round 921 (Div. 1, Div. 2) Editorial | |
| 497 | Digital Patterns | combinatorics data structures implementation math | Statement | F | Codeforces Round 924 (Div. 2) {1928} | PROGRAMMING | 2750.0 | Codeforces Round 924 Editorial | |
| 5959 | Sasha and a Walk in the City | combinatorics dfs and similar dp math trees | Statement | D | Codeforces Round 926 (Div. 2) {1929} | PROGRAMMING | 2000.0 | Codeforces Round #926 (Div. 2) Editorial. | |
| 2370 | Sasha and the Wedding Binary Search Tree | combinatorics dfs and similar math sortings trees | Statement | F | Codeforces Round 926 (Div. 2) {1929} | PROGRAMMING | 3000.0 | Codeforces Round #926 (Div. 2) Editorial. | |
| 112 | Counting Is Fun | combinatorics | Statement | I | think-cell Round 1 {1930} | PROGRAMMING | 5000.0 | think-cell Round 1 Editorial | |
| 1535 | 2..3...4.... Wonderful! Wonderful! | combinatorics math | Statement | E | think-cell Round 1 {1930} | PROGRAMMING | 2500.0 | think-cell Round 1 Editorial | |
| 3835 | One-Dimensional Puzzle | combinatorics constructive algorithms math number theory | Statement | G | Codeforces Round 925 (Div. 3) {1931} | PROGRAMMING | 125878 | ||
| 33534 | Divisible Pairs | combinatorics data structures hashing math | Statement | D | Codeforces Round 925 (Div. 3) {1931} | PROGRAMMING | 125878 | ||
| 12845 | Chat Screenshots | combinatorics dfs and similar graphs implementation | Statement | F | Codeforces Round 925 (Div. 3) {1931} | PROGRAMMING | 125878 | ||
| 1223 | Turtle Magic: Royal Turtle Shell Pattern | bitmasks brute force combinatorics math | Statement | G | Codeforces Round 929 (Div. 3) {1933} | PROGRAMMING | Codeforces Round 929 (Div. 3) Editorial | ||
| 11210 | Exam in MAC | binary search combinatorics math | Statement | D | Codeforces Round 932 (Div. 2) {1935} | PROGRAMMING | 1750.0 | Codeforces Round #932 (Div. 2) Editorial | |
| 2044 | Farm Game | combinatorics games math | Statement | E | CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!) {1942} | PROGRAMMING | 2500.0 | CodeTON Round 8 Editorial | |
| 876 | Bessie and Cards | combinatorics math | Statement | G | CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!) {1942} | PROGRAMMING | 3000.0 | CodeTON Round 8 Editorial | |
| 2027 | Counting Is Fun (Easy Version) | combinatorics dp | Statement | D1 | Codeforces Round 934 (Div. 1) {1943} | PROGRAMMING | 1250.0 | Codeforces Round #934 (Div1, Div2) Editorial | |
| 1212 | Counting Is Fun (Hard Version) | combinatorics dp | Statement | D2 | Codeforces Round 934 (Div. 1) {1943} | PROGRAMMING | 2000.0 | Codeforces Round #934 (Div1, Div2) Editorial | |
| 3268 | Girl Permutation | combinatorics dp math number theory | Statement | E | Codeforces Round 936 (Div. 2) {1946} | PROGRAMMING | 2250.0 | Codeforces Round #936 (Div. 2) Editorial | |
| 1744 | Rare Coins | combinatorics math probabilities | Statement | F | Educational Codeforces Round 163 (Rated for Div. 2) {1948} | PROGRAMMING | Educational Codeforces Round 163 Editorial | ||
| 562 | Clacking Balls | combinatorics math probabilities | Statement | G | Codeforces Global Round 25 {1951} | PROGRAMMING | 3250.0 | Codeforces Global Round 25 Editorial | |
| 913 | Help, what does it mean to be "Based" | brute force combinatorics constructive algorithms games implementation sortings | Statement | J | April Fools Day Contest 2024 {1952} | PROGRAMMING | April Fools Day Contest 2024 Editorial | ||
| 346 | Sweep Line | combinatorics games math | Statement | E | April Fools Day Contest 2024 {1952} | PROGRAMMING | April Fools Day Contest 2024 Editorial | ||
| 8472 | Colored Balls | combinatorics dp greedy math sortings | Statement | D | Educational Codeforces Round 164 (Rated for Div. 2) {1954} | PROGRAMMING | Educational Codeforces Round 164 Editorial | ||
| 466 | Unique Strings | combinatorics dp math | Statement | F | Educational Codeforces Round 164 (Rated for Div. 2) {1954} | PROGRAMMING | Educational Codeforces Round 164 Editorial | ||
| 12257 | How Does the Rook Move? | combinatorics dp math | Statement | C | Codeforces Round 940 (Div. 2) and CodeCraft-23 {1957} | PROGRAMMING | 1500.0 | Codeforces Round #940 and CodeCraft-23 (Div. 2) Editorial | 1600 |
| 1690 | Carousel of Combinations | brute force combinatorics dp math number theory | Statement | E | Codeforces Round 940 (Div. 2) and CodeCraft-23 {1957} | PROGRAMMING | 2250.0 | Codeforces Round #940 and CodeCraft-23 (Div. 2) Editorial | 2400 |
| 267 | Narrow Paths | *special combinatorics | Statement | F | Kotlin Heroes: Episode 10 {1958} | PROGRAMMING | 129483 | 2000 | |
| 2320 | Fenwick Tree | bitmasks brute force combinatorics data structures dp math trees | Statement | C | Codeforces Round 942 (Div. 1) {1967} | PROGRAMMING | 1250.0 | Tutorial | 2300 |
| 479 | Again Counting Arrays (Easy Version) | combinatorics dp fft math | Statement | E1 | Codeforces Round 942 (Div. 1) {1967} | PROGRAMMING | 1750.0 | Tutorial | 3100 |
| 238 | Again Counting Arrays (Hard Version) | combinatorics dp math | Statement | E2 | Codeforces Round 942 (Div. 1) {1967} | PROGRAMMING | 1000.0 | Tutorial | 3500 |
| 19472 | Beautiful Triple Pairs | combinatorics data structures | Statement | C | Codeforces Round 946 (Div. 3) {1974} | PROGRAMMING | Codeforces Round #946 (Div. 3) Editorial | 1400 | |
| 1089 | Set | bitmasks brute force combinatorics dfs and similar divide and conquer dp math | Statement | F | Codeforces Round 947 (Div. 1 + Div. 2) {1975} | PROGRAMMING | 2500.0 | editorial_zh.pdf | 2600 |
| 5965 | Invertible Bracket Sequences | binary search combinatorics data structures divide and conquer implementation two pointers | Statement | D | Educational Codeforces Round 166 (Rated for Div. 2) {1976} | PROGRAMMING | Educational Codeforces Round 166 Editorial | ||
| 1357 | Splittable Permutations | combinatorics data structures dfs and similar greedy math trees | Statement | E | Educational Codeforces Round 166 (Rated for Div. 2) {1976} | PROGRAMMING | Educational Codeforces Round 166 Editorial | ||
| 22604 | Earning on Bets | binary search combinatorics constructive algorithms number theory | Statement | C | Codeforces Round 951 (Div. 2) {1979} | PROGRAMMING | 1500.0 | Codeforces Round 951 (Div. 2) Editorial | |
| 1955 | Number of k-good subarrays | bitmasks combinatorics divide and conquer dp math meet-in-the-middle | Statement | E | Codeforces Round 955 (Div. 2, с призами от NEAR!) {1982} | PROGRAMMING | 2500.0 | 130839 | |
| 2584 | I Love Balls | combinatorics math probabilities | Statement | E | Codeforces Round 956 (Div. 2) and ByteRace 2024 {1983} | PROGRAMMING | 2000.0 | ||
| 8905 | Magnitude (Hard Version) | combinatorics dp greedy | Statement | C2 | Codeforces Global Round 26 {1984} | PROGRAMMING | 1250.0 | Codeforces Global Round 26 Editorial | |
| 12651 | D-Function | bitmasks combinatorics math number theory | Statement | G | Codeforces Round 952 (Div. 4) {1985} | PROGRAMMING | Codeforces Round 952 (Div. 4) Editorial | ||
| 23986 | Secret Box | brute force combinatorics math | Statement | E | Codeforces Round 952 (Div. 4) {1985} | PROGRAMMING | Codeforces Round 952 (Div. 4) Editorial | ||
| 1976 | Permutation Problem (Simple Version) | brute force combinatorics math number theory | Statement | G1 | Codeforces Round 954 (Div. 3) {1986} | PROGRAMMING | 130762 | ||
| 6933 | Non-academic Problem | combinatorics dfs and similar dsu graphs | Statement | F | Codeforces Round 954 (Div. 3) {1986} | PROGRAMMING | 130762 | ||
| 487 | Heartbeat | combinatorics dp fft math | Statement | F | Codeforces Round 958 (Div. 2) {1988} | PROGRAMMING | 3500.0 | Editorial of Codeforces Round 958 (Div. 2) | |
| 2611 | Distance to Different | combinatorics dp | Statement | E | Educational Codeforces Round 167 (Rated for Div. 2) {1989} | PROGRAMMING | Educational Codeforces Round 167 Editorial | ||
| 4359 | Ultra-Meow | combinatorics math number theory | Statement | G | Codeforces Round 957 (Div. 3) {1992} | PROGRAMMING | Shayan's Video Tutorial | ||
| 3070 | Cases | bitmasks brute force combinatorics dfs and similar dp graphs greedy strings | Statement | D | Codeforces Round 961 (Div. 2) {1995} | PROGRAMMING | 2250.0 | Video Tutorial | |
| 12960 | Decode | brute force combinatorics implementation | Statement | E | Codeforces Round 962 (Div. 3) {1996} | PROGRAMMING | Codeforces Round 962 (Div. 3) Editorial | ||
| 14622 | Expected Median | combinatorics math | Statement | F | Codeforces Round 964 (Div. 4) {1999} | PROGRAMMING | Video Tutorial | ||
| 16783 | Photoshoot for Gorillas | combinatorics data structures greedy math | Statement | E | Codeforces Round 966 (Div. 3) {2000} | PROGRAMMING | 132689 | ||
| 1580 | Deterministic Heap (Easy Version) | brute force combinatorics dp | Statement | E1 | Codeforces Round 967 (Div. 2) {2001} | PROGRAMMING | 2000.0 | Video Tutorial | |
| 306 | Deterministic Heap (Hard Version) | combinatorics dp | Statement | E2 | Codeforces Round 967 (Div. 2) {2001} | PROGRAMMING | 2000.0 | Video Tutorial | |
| 180 | Dora's Paint | brute force combinatorics constructive algorithms graphs | Statement | F | Codeforces Round 969 (Div. 1) {2006} | PROGRAMMING | 3000.0 | Tutorial | |
| 346 | Speedbreaker Counting (Easy Version) | combinatorics dp games greedy implementation math | Statement | F1 | Codeforces Round 975 (Div. 1) {2018} | PROGRAMMING | 1500.0 | Editorial of Codeforces Round 975 (Div. 1, Div. 2) | |
| 791 | Billetes MX (Easy Version) | 2-sat binary search combinatorics dfs and similar dsu graphs | Statement | E1 | Codeforces Round 978 (Div. 2) {2022} | PROGRAMMING | 2250.0 | Codeforces Round 978 (Div 2) Editorial | |
| 742 | Billetes MX (Hard Version) | binary search combinatorics dfs and similar dsu graphs | Statement | E2 | Codeforces Round 978 (Div. 2) {2022} | PROGRAMMING | 1000.0 | Codeforces Round 978 (Div 2) Editorial | |
| 2427 | Card Game | combinatorics dp fft greedy math | Statement | E | Educational Codeforces Round 170 (Rated for Div. 2) {2025} | PROGRAMMING | Educational Codeforces Round 170 Editorial | ||
| 19944 | Binomial Coefficients, Kind Of | combinatorics math | Statement | B | Educational Codeforces Round 170 (Rated for Div. 2) {2025} | PROGRAMMING | Educational Codeforces Round 170 Editorial | ||
| 1957 | The Endspeaker (Hard Version) | binary search combinatorics data structures dp greedy implementation two pointers | Statement | D2 | Codeforces Round 982 (Div. 2) {2027} | PROGRAMMING | 1000.0 | Codeforces Round #982 (Div. 2) Editorial | |
| 113 | Message Spread | bitmasks combinatorics dp | Statement | H | Refact.ai Match 1 (Codeforces Round 985) {2029} | PROGRAMMING | 5000.0 | Refact.ai Match 1 (Codeforces Round 985) Editorial | |
| 24164 | Minimise Oneness | brute force combinatorics constructive algorithms | Statement | B | Codeforces Round 979 (Div. 2) {2030} | PROGRAMMING | 500.0 | Codeforces Round 979 Editorial | |
| 2034 | MEXimize the Score | brute force combinatorics data structures dp math | Statement | E | Codeforces Round 979 (Div. 2) {2030} | PROGRAMMING | 2000.0 | Codeforces Round 979 Editorial | |
| 275 | The Destruction of the Universe (Easy Version) | combinatorics math | Statement | G1 | Codeforces Round 979 (Div. 2) {2030} | PROGRAMMING | 3000.0 | Codeforces Round 979 Editorial | |
| 504 | Peanuts | combinatorics dp games math | Statement | F | Codeforces Round 983 (Div. 2) {2032} | PROGRAMMING | 3000.0 | Codeforces Round 983 (Div. 2) Editorial | |
| 2067 | Permutations Harmony | brute force combinatorics constructive algorithms greedy hashing implementation math | Statement | E | Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2) {2034} | PROGRAMMING | 2000.0 | Rayan 2024 Selection Round Editorial | |
| 912 | Khayyam's Royal Decree (Easy Version) | combinatorics dp math | Statement | F1 | Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2) {2034} | PROGRAMMING | 2000.0 | Rayan 2024 Selection Round Editorial | |
| 614 | Khayyam's Royal Decree (Hard Version) | combinatorics dp math | Statement | F2 | Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2) {2034} | PROGRAMMING | 2000.0 | Rayan 2024 Selection Round Editorial | |
| 3939 | Natlan Exploring | combinatorics dp math number theory | Statement | G | Codeforces Round 988 (Div. 3) {2037} | PROGRAMMING | Video Tutorial | ||
| 499 | Alternative Platforms | combinatorics data structures fft math sortings | Statement | F | 2024-2025 ICPC, NERC, Southern and Volga Russian Regional Contest (Unrated, Online Mirror, ICPC Rules, Preferably Teams) {2038} | PROGRAMMING | 2500 | ||
| 2431 | Shohag Loves Inversions | combinatorics constructive algorithms dp math | Statement | E | CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) {2039} | PROGRAMMING | 2750.0 | Editorial of CodeTON Round 9 (Div. 1 + Div. 2) | |
| 539 | Shohag Loves Counting (Easy Version) | combinatorics dp math number theory | Statement | F1 | CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) {2039} | PROGRAMMING | 2000.0 | Editorial of CodeTON Round 9 (Div. 1 + Div. 2) | |
| 2817 | Control of Randomness | combinatorics dfs and similar graphs greedy math probabilities trees | Statement | E | Codeforces Round 992 (Div. 2) {2040} | PROGRAMMING | 2250.0 | Codeforces Round #992 (Div.2) Editorial | |
| 473 | Number of Cubes | combinatorics math number theory | Statement | F | Codeforces Round 992 (Div. 2) {2040} | PROGRAMMING | 2750.0 | Codeforces Round #992 (Div.2) Editorial | |
| 1066 | Sheet Music | combinatorics dp | Statement | H | 2024 ICPC Asia Taichung Regional Contest (Unrated, Online Mirror, ICPC Rules, Preferably Teams) {2041} | PROGRAMMING | Problem Analysis and Hints (PDF) | ||
| 387 | Narrower Passageway | combinatorics data structures | Statement | E | 2024-2025 ICPC Asia Jakarta Regional Contest (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {2045} | PROGRAMMING | raRzKDJLPHcUnqTcwvGznwEdKiDWjEkd.pdf | 2700 | |
| 19772 | Replace Character | brute force combinatorics greedy strings | Statement | B | Codeforces Round 990 (Div. 2) {2047} | PROGRAMMING | 1000.0 | Разбор Codeforces Round 990 (Div. 2 + Div. 1) | |
| 776 | Kevin and Matrices | combinatorics math | Statement | G | Codeforces Global Round 28 {2048} | PROGRAMMING | 2250.0 | Tutorial | |
| 371 | Xor of Median (Hard Version) | bitmasks combinatorics | Statement | F2 | Codeforces Round 997 (Div. 2) {2056} | PROGRAMMING | 1250.0 | Codeforces Round #997 (Div. 2) Editorial | |
| 464 | Xor of Median (Easy Version) | bitmasks combinatorics dp math | Statement | F1 | Codeforces Round 997 (Div. 2) {2056} | PROGRAMMING | 2750.0 | Codeforces Round #997 (Div. 2) Editorial | |
| 1068 | Nested Segments | combinatorics dp math trees | Statement | E | Codeforces Round 997 (Div. 2) {2056} | PROGRAMMING | 2250.0 | Codeforces Round #997 (Div. 2) Editorial | |
| 2681 | Multiplicative Arrays | combinatorics dp | Statement | F | Codeforces Round 998 (Div. 3) {2060} | PROGRAMMING | Codeforces Round 998 (Div. 3) Editorial | ||
| 207 | Galaxy Generator | bitmasks combinatorics dp | Statement | H | Ethflow Round 1 (Codeforces Round 1001, Div. 1 + Div. 2) {2062} | PROGRAMMING | 4500.0 | Ethflow Round 1 (Codeforces Round 1001, Div. 1 + Div. 2) Editorial | |
| 1585 | Counting Is Not Fun (Easy Version) | combinatorics data structures dfs and similar dsu implementation math | Statement | F1 | Codeforces Round 1000 (Div. 2) {2063} | PROGRAMMING | 1750.0 | Codeforces Round 1000 (Div. 2) — Editorial | |
| 955 | Counting Is Not Fun (Hard Version) | combinatorics data structures dfs and similar dsu trees | Statement | F2 | Codeforces Round 1000 (Div. 2) {2063} | PROGRAMMING | 1500.0 | Codeforces Round 1000 (Div. 2) — Editorial | |
| 1533 | Mycraft Sand Sort | combinatorics data structures dsu | Statement | E | Codeforces Round 1005 (Div. 2) {2064} | PROGRAMMING | 2250.0 | Codeforces Round 1005 (Div. 2) Editorial | |
| 2060 | Bro Thinks He's Him | combinatorics data structures dp matrices | Statement | H | Codeforces Round 1003 (Div. 4) {2065} | PROGRAMMING | Video Tutorial | ||
| 2588 | Bitwise Slides | bitmasks combinatorics dp math | Statement | C | Codeforces Round 1004 (Div. 1) {2066} | PROGRAMMING | 1250.0 | 139415 | |
| 1526 | Club of Young Aircraft Builders (easy version) | combinatorics dp math | Statement | D1 | Codeforces Round 1004 (Div. 1) {2066} | PROGRAMMING | 750.0 | 139415 | |
| 671 | Club of Young Aircraft Builders (hard version) | combinatorics dp math | Statement | D2 | Codeforces Round 1004 (Div. 1) {2066} | PROGRAMMING | 1250.0 | 139415 | |
| 1668 | The Ultimate Wine Tasting Event | combinatorics greedy | Statement | J | European Championship 2025 - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {2068} | PROGRAMMING | 140239 | ||
| 15413 | Beautiful Sequence | combinatorics dp greedy | Statement | C | Educational Codeforces Round 174 (Rated for Div. 2) {2069} | PROGRAMMING | 139774 | ||
| 11670 | Tree Jumps | combinatorics dfs and similar dp trees | Statement | D | Educational Codeforces Round 175 (Rated for Div. 2) {2070} | PROGRAMMING | Video Tutorial | ||
| 848 | LeaFall | combinatorics probabilities trees | Statement | E | Codeforces Round 1007 (Div. 2) {2071} | PROGRAMMING | 2500.0 | Codeforces Round 1007 (Div. 2) Editorial | |
| 8761 | Goodbye, Banker Life | bitmasks combinatorics constructive algorithms math number theory | Statement | F | Codeforces Round 1006 (Div. 3) {2072} | PROGRAMMING | Codeforces Round 1006 (Div. 3) Editorial | ||
| 31652 | Having Been a Treasurer in the Past, I Help Goblins Deceive | combinatorics constructive algorithms strings | Statement | B | Codeforces Round 1006 (Div. 3) {2072} | PROGRAMMING | Codeforces Round 1006 (Div. 3) Editorial | ||
| 641 | Another Folding Strip | combinatorics data structures divide and conquer dp math sortings | Statement | E | Codeforces Round 1008 (Div. 1) {2077} | PROGRAMMING | 2250.0 | Codeforces Round 1008 (Div. 1, Div. 2) Editorial | |
| 2449 | Binary Subsequence Value Sum | combinatorics dp fft implementation math | Statement | C | Codeforces Round 1008 (Div. 1) {2077} | PROGRAMMING | 1500.0 | Codeforces Round 1008 (Div. 1, Div. 2) Editorial | |
| 92 | Quantifier | combinatorics dp implementation | Statement | E | Codeforces Round 1010 (Div. 1, Unrated) {2081} | PROGRAMMING | 2250.0 | Codeforces Round 1010 (Div. 1, Div. 2, based on Zhili Cup 2025) Editorial | |
| 1841 | Blossom | combinatorics fft math | Statement | E | Teza Round 1 (Codeforces Round 1015, Div. 1 + Div. 2) {2084} | PROGRAMMING | 2250.0 | 141155 | |
| 8677 | Even String | combinatorics dp math strings | Statement | D | Educational Codeforces Round 177 (Rated for Div. 2) {2086} | PROGRAMMING | Educational Codeforces Round 177 Editorial | ||
| 3936 | She knows... | combinatorics constructive algorithms graphs math | Statement | E | Codeforces Round 1014 (Div. 2) {2092} | PROGRAMMING | 2250.0 | Codeforces Round #1014 (Div. 2) Editorial | |
| 239 | Wonderful XOR Problem | bitmasks combinatorics dp fft math | Statement | H | Neowise Labs Contest 1 (Codeforces Round 1018, Div. 1 + Div. 2) {2096} | PROGRAMMING | 3500.0 | Neowise Labs Contest 1 (Codeforces Round 1018, Div. 1 + Div. 2) Editorial | |
| 2000 | Baggage Claim | combinatorics dsu graphs math trees | Statement | B | Codeforces Round 1021 (Div. 1) {2097} | PROGRAMMING | 1000.0 | 142316 | |
| 252 | Shoo Shatters the Sunshine | combinatorics dp trees | Statement | F | Codeforces Round 1024 (Div. 1) {2101} | PROGRAMMING | 3750.0 | 142788 | |
| 22442 | Permutation Warm-Up | combinatorics greedy math number theory | Statement | A | Codeforces Round 1022 (Div. 2) {2108} | PROGRAMMING | 500.0 | Codeforces Round 1022 Editorial | |
| 1881 | Binary String Wowee | combinatorics dp strings | Statement | E | Codeforces Round 1025 (Div. 2) {2109} | PROGRAMMING | 2500.0 | Codeforces Round 1025 (Div. 2) Editorial | |
| 3474 | Tree Colorings | combinatorics dp graphs math trees | Statement | E | Educational Codeforces Round 180 (Rated for Div. 2) {2112} | PROGRAMMING | Educational Codeforces Round 180 — Editorial | ||
| 1982 | Gellyfish and Eternal Violet | combinatorics dp greedy math meet-in-the-middle probabilities | Statement | C | Codeforces Round 1028 (Div. 1) {2115} | PROGRAMMING | 1750.0 | Codeforces Round 1028 (Div.1, Div.2) Editorial | |
| 6142 | Wildflower | combinatorics dfs and similar trees | Statement | F | Codeforces Round 1029 (Div. 3) {2117} | PROGRAMMING | Codeforces Round 1029 (Div. 3) Editorial | ||
| 3583 | Token Removing | combinatorics dp math | Statement | D | Codeforces Round 1035 (Div. 2) {2119} | PROGRAMMING | 2250.0 | Codeforces Round 1035 (Div. 2) Editorial | |
| 5999 | Matrix game | combinatorics math | Statement | D | Codeforces Round 1033 (Div. 2) and CodeNite 2025 {2120} | PROGRAMMING | 1750.0 | Codeforces Round 1033 (Div. 2) and CodeNite 2025 Editorial | |
| 2275 | Tree Parking | combinatorics math trees | Statement | G | Order Capital Round 1 (Codeforces Round 1038, Div. 1 + Div. 2) {2122} | PROGRAMMING | 4000.0 | Order Capital Round 1 (Codeforces Round 1038, Div. 1 + Div. 2) Editorial | |
| 3396 | Appending Permutations (Easy Version) | combinatorics dp | Statement | F1 | EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2) {2124} | PROGRAMMING | 2000.0 | EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2) Editorial | |
| 1176 | Appending Permutations (Hard Version) | combinatorics dp | Statement | F2 | EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2) {2124} | PROGRAMMING | 2000.0 | EPIC Institute of Technology Round Summer 2025 (Codeforces Round 1036, Div. 1 + Div. 2) Editorial | |
| 1457 | Sets of Complementary Sums | combinatorics dp math two pointers | Statement | E | Educational Codeforces Round 181 (Rated for Div. 2) {2125} | PROGRAMMING | Educational Codeforces Round 181 Editorial | ||
| 23545 | Count Good Numbers | combinatorics math number theory | Statement | C | Educational Codeforces Round 181 (Rated for Div. 2) {2125} | PROGRAMMING | Educational Codeforces Round 181 Editorial | ||
| 8299 | Root was Built by Love, Broken by Destiny | combinatorics dfs and similar graphs trees | Statement | D | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} | PROGRAMMING | 2000.0 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial | |
| 2865 | Hamed and AghaBalaSar | combinatorics math | Statement | F | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} | PROGRAMMING | 3000.0 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial | |
| 13051 | Sum of LDS | combinatorics dp math | Statement | D | Codeforces Round 1039 (Div. 2) {2128} | PROGRAMMING | 1750.0 | Codeforces Round #1039 — Editorial | |
| 3652 | Permutation Blackhole | combinatorics dp | Statement | D | Codeforces Round 1040 (Div. 1) {2129} | PROGRAMMING | 2000.0 | Codeforces Round 1040 (Div. 1, Div. 2) Editorial | |
| 929 | Sea, You & copriMe | brute force combinatorics constructive algorithms graphs greedy math number theory | Statement | H | Codeforces Round 1042 (Div. 3) {2131} | PROGRAMMING | Codeforces Round 1042 (Div. 3) Editorial | ||
| 714 | Permutation Oddness | combinatorics dp | Statement | F | Codeforces Round 1045 (Div. 2) {2134} | PROGRAMMING | 2750.0 | 145832 | |
| 1307 | Beyond the Palindrome (Easy Version) | combinatorics dp math | Statement | E1 | Codeforces Round 1046 (Div. 1) {2135} | PROGRAMMING | 3000.0 | Codeforces Round 1046 (Div. 1, Div. 2) Editorial | |
| 266 | Beyond the Palindrome (Hard Version) | combinatorics dp math number theory | Statement | E2 | Codeforces Round 1046 (Div. 1) {2135} | PROGRAMMING | 2000.0 | Codeforces Round 1046 (Div. 1, Div. 2) Editorial | |
| 685 | Antiamuny and Slider Movement | binary search brute force combinatorics implementation math | Statement | D | Codeforces Round 1048 (Div. 1) {2138} | PROGRAMMING | 2500.0 | Codeforces Round 1048 (Div. 1, Div. 2) Editorial | |
| 2256 | Prime Gaming (Easy Version) | bitmasks combinatorics dp | Statement | E1 | Codeforces Round 1049 (Div. 2) {2140} | PROGRAMMING | 1750.0 | Codeforces Round 1049 (Div. 2) Editorial | |
| 1306 | Prime Gaming (Hard Version) | bitmasks combinatorics dp probabilities | Statement | E2 | Codeforces Round 1049 (Div. 2) {2140} | PROGRAMMING | 1000.0 | Codeforces Round 1049 (Div. 2) Editorial | |
| 1579 | Looking at Towers (difficult version) | combinatorics data structures dp implementation | Statement | E2 | Educational Codeforces Round 182 (Rated for Div. 2) {2144} | PROGRAMMING | Educational Codeforces Round 182 Editorial | ||
| 15932 | Non-Descending Arrays | combinatorics dp | Statement | C | Educational Codeforces Round 182 (Rated for Div. 2) {2144} | PROGRAMMING | Educational Codeforces Round 182 Editorial | ||
| 2827 | Looking at Towers (easy version) | combinatorics dp implementation | Statement | E1 | Educational Codeforces Round 182 (Rated for Div. 2) {2144} | PROGRAMMING | Educational Codeforces Round 182 Editorial | ||
| 651 | Cost of Coloring | combinatorics fft math | Statement | G | Educational Codeforces Round 183 (Rated for Div. 2) {2145} | PROGRAMMING | Educational Codeforces Round 183 Editorial | ||
| 345 | Bubble Sort | brute force combinatorics dp | Statement | F | Codeforces Round 1052 (Div. 2) {2146} | PROGRAMMING | 3500.0 | Codeforces Round 1052 (Div. 2) Editorial | |
| 1227 | Modular Tetration | combinatorics math number theory | Statement | G | Codeforces Global Round 29 (Div. 1 + Div. 2) {2147} | PROGRAMMING | 4500.0 | ||
| 1299 | Attraction Theory | combinatorics dp implementation math | Statement | D | Codeforces Round 1053 (Div. 1) {2150} | PROGRAMMING | 2500.0 | Editorial of Codeforces Round 1053 (Div. 1, Div. 2) | |
| 8342 | Grid Counting | combinatorics math | Statement | B | Codeforces Round 1053 (Div. 1) {2150} | PROGRAMMING | 1000.0 | Editorial of Codeforces Round 1053 (Div. 1, Div. 2) | |
| 599 | Bombing (Easy Version) | combinatorics dp | Statement | F1 | Codeforces Round 1060 (Div. 2) {2154} | PROGRAMMING | 2250.0 | Codeforces Round 1060 (Div. 2) Editorial | |
| 200 | Bombing (Hard Version) | combinatorics dp | Statement | F2 | Codeforces Round 1060 (Div. 2) {2154} | PROGRAMMING | 1750.0 | Codeforces Round 1060 (Div. 2) Editorial | |
| 521 | Keygen 3 | brute force combinatorics constructive algorithms | Statement | H | Codeforces Round 1066 (Div. 1 + Div. 2) {2157} | PROGRAMMING | 3750.0 | Codeforces Round 1066 (Div. 1 + Div. 2) Editorial | |
| 295 | Distinct GCDs (Hard Version) | combinatorics constructive algorithms graphs graphs graphs math number theory number theory | Statement | F2 | Codeforces Round 1067 (Div. 2) {2158} | PROGRAMMING | 1000.0 | Codeforces Round 1067 (Div. 2) Editorial | |
| 3420 | Twin Polynomials | combinatorics graph matchings graphs math | Statement | C | Codeforces Round 1058 (Div. 1) {2159} | PROGRAMMING | 1500.0 | Codeforces Round 1058 Editorial | |
| 383 | SubMST | combinatorics graphs trees | Statement | F | Pinely Round 5 (Div. 1 + Div. 2) {2161} | PROGRAMMING | 3250.0 | ||
| 817 | Left is Always Right | combinatorics math | Statement | E | Pinely Round 5 (Div. 1 + Div. 2) {2161} | PROGRAMMING | 3000.0 | ||
| 873 | Chain Prefix Rank (Hard Version) | combinatorics data structures dp math | Statement | F2 | Codeforces Global Round 30 (Div. 1 + Div. 2) {2164} | PROGRAMMING | 1500.0 | Codeforces Global Round 30 Editorial | |
| 1834 | Chain Prefix Rank (Easy Version) | combinatorics dfs and similar dp math | Statement | F1 | Codeforces Global Round 30 (Div. 1 + Div. 2) {2164} | PROGRAMMING | 2500.0 | Codeforces Global Round 30 Editorial | |
| 359 | Subsequence Problem | combinatorics dp fft math | Statement | F | Educational Codeforces Round 184 (Rated for Div. 2) {2169} | PROGRAMMING | Educational Codeforces Round 184 Editorial | ||
| 2491 | Binary Strings and Blocks | combinatorics dp | Statement | E | Educational Codeforces Round 185 (Rated for Div. 2) {2170} | PROGRAMMING | Educational Codeforces Round 185 Editorial | ||
| 2500 | Sakura Adachi and Optimal Sequences | bitmasks combinatorics greedy math | Statement | G | Codeforces Round 1065 (Div. 3) {2171} | PROGRAMMING | Codeforces Round 1065 (Div. 3) Editorial | ||
| 518 | Mosaic Tree | combinatorics dp fft math trees | Statement | F | Codeforces Round 1069 (Div. 1) {2174} | PROGRAMMING | 3500.0 | Codeforces Round 1069 Editorial | |
| 1892 | Conquer or of Forest | combinatorics dfs and similar dsu trees | Statement | F | Good Bye 2025 {2178} | PROGRAMMING | 2750.0 | ||
| 271 | Numbers or Fireworks | combinatorics dp | Statement | I | Good Bye 2025 {2178} | PROGRAMMING | 4000.0 | ||
| 437 | Control Car (Easy Version) | combinatorics dp probabilities | Statement | F1 | Codeforces Global Round 31 (Div. 1 + Div. 2) {2180} | PROGRAMMING | 2500.0 | Codeforces Global Round 31 | |
| 249 | Control Car (Hard Version) | combinatorics dp probabilities | Statement | F2 | Codeforces Global Round 31 (Div. 1 + Div. 2) {2180} | PROGRAMMING | 750.0 | Codeforces Global Round 31 | |
| 157 | Balance | combinatorics math | Statement | G | Codeforces Global Round 31 (Div. 1 + Div. 2) {2180} | PROGRAMMING | 2750.0 | Codeforces Global Round 31 | |
| 1355 | Christmas Reindeer (easy version) | bitmasks combinatorics dp | Statement | F1 | Educational Codeforces Round 186 (Rated for Div. 2) {2182} | PROGRAMMING | Educational Codeforces Round 186 Editorial | ||
| 1170 | Christmas Reindeer (hard version) | bitmasks combinatorics dp | Statement | F2 | Educational Codeforces Round 186 (Rated for Div. 2) {2182} | PROGRAMMING | Educational Codeforces Round 186 Editorial |