Review the problem statement from Codeforces (link will open a new tab). When you've matched your problem, go to the solutions.
Search on plain tags, ratings, names, and problem text. Example: brute force or binary search
Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 3858 | Exposition | binary search data structures dsu trees two pointers | Statement | E | Codeforces Beta Round 6 (Div. 2 Only) {6} | PROGRAMMING | Beta Round #6 - Разбор задач | 1900 | |
| 7891 | Holes | data structures dsu | Statement | E | Codeforces Beta Round 13 {13} | PROGRAMMING | Codeforces Beta Round #13 editorial | 2700 | |
| 1926 | Beard Graph | data structures dsu trees | Statement | D | Codeforces Round 112 (Div. 2) {165} | PROGRAMMING | Codeforces Round #112 (Div. 2) Tutorial | 2200 | |
| 1729 | Counter Attack | data structures dsu graphs hashing sortings | Statement | E | Codeforces Round 120 (Div. 2) {190} | PROGRAMMING | Codeforces Round #120 (Div.2) — editorial | 2300 | |
| 856 | Building Forest | data structures dsu graphs | Statement | E | Codeforces Round 123 (Div. 2) {195} | PROGRAMMING | Codeforces Round #123 (Div. 2) Разбор Задач | 2200 | |
| 613 | Cutting a Fence | binary search data structures dsu | Statement | D | VK Cup 2012 Finals (unofficial online-version) {212} | PROGRAMMING | 2400 | ||
| 353 | Alien DNA | data structures dsu trees | Statement | E | Codeforces Round 134 (Div. 1) {217} | PROGRAMMING | Editorial for Codeforces Round #134 | 2700 | |
| 2762 | Connected Components | data structures dfs and similar dp dsu | Statement | D | Croc Champ 2013 - Round 1 {292} | PROGRAMMING | Чемпионат КРОК 2013 — Раунд 1 (Разбор задач) | 1900 | |
| 599 | Ilya and Two Numbers | constructive algorithms data structures dsu greedy | Statement | E | Codeforces Round 186 (Div. 2) {313} | PROGRAMMING | Tutorial | 2300 | |
| 16701 | Knight Tournament | data structures dsu | Statement | A | Codeforces Round 207 (Div. 1) {356} | PROGRAMMING | 9210 | 1700 | |
| 1018 | Fools and Foolproof Roads | data structures dfs and similar dsu graphs greedy | Statement | D | Codeforces Round 212 (Div. 2) {362} | PROGRAMMING | Codeforces Round #212 (Div. 2). Tutorial. Part 1. | 2500 | |
| 1720 | Dima and Trap Graph | binary search data structures dfs and similar dsu shortest paths two pointers | Statement | D | Codeforces Round 214 (Div. 2) {366} | PROGRAMMING | Codeforces Round #214 (Div. 2) — Tutorial | 2400 | |
| 6458 | Vessels | data structures dsu implementation trees | Statement | D | Codeforces Round 218 (Div. 2) {371} | PROGRAMMING | Codeforces Round #218 (Div. 2): Tutorial | 1900 | |
| 206 | Inna and Babies | binary search data structures dsu geometry implementation | Statement | E | Codeforces Round 220 (Div. 2) {374} | PROGRAMMING | Codeforces Round #220 (Div. 2) разбор | 2600 | |
| 1194 | Three strings | data structures dsu string suffix structures strings | Statement | E | MemSQL Start[c]UP 2.0 - Round 1 {452} | PROGRAMMING | MemSQL Start[c]UP 2.0 Round 1 and 2 Editorials | 2400 | |
| 88 | MUH and Lots and Lots of Segments | data structures dsu | Statement | E | Codeforces Round 269 (Div. 2) {471} | PROGRAMMING | Codeforces Round #269 Editorial | 2700 | |
| 1577 | New Year Domino | data structures dp dsu | Statement | E | Good Bye 2014 {500} | PROGRAMMING | Tutorial 2 | 2200 | |
| 19291 | Misha and Changing Handles | data structures dsu strings | Statement | B | Codeforces Round 285 (Div. 2) {501} | PROGRAMMING | Tutorial | 1100 | |
| 10819 | Mike and Feet | binary search data structures dp dsu | Statement | B | Codeforces Round 305 (Div. 1) {547} | PROGRAMMING | Codeforces Round #305 Editorial | 2100 | |
| 3909 | Restructuring Company | data structures dsu | Statement | D | VK Cup 2015 - Finals, online mirror {566} | PROGRAMMING | Editorial for VK Cup 2015 — Finals | 1900 | |
| 806 | Campus | binary search data structures dsu trees | Statement | D | Codeforces Round 317 [AimFund Thanks-Round] (Div. 1) {571} | PROGRAMMING | Codeforces Round #317 [AimFund Thanks-Round] Editorial | 3000 | |
| 18197 | Lomsat gelral | data structures dfs and similar dsu trees | Statement | E | Educational Codeforces Round 2 {600} | PROGRAMMING | Editorial | 2300 | |
| 1243 | Acyclic Organic Compounds | data structures dfs and similar dsu hashing strings trees | Statement | D | Codeforces Round 333 (Div. 1) {601} | PROGRAMMING | Codeforces Round #333 — editorial | 2400 | |
| 1539 | Pastoral Oddities | data structures divide and conquer dsu math trees | Statement | E | Codeforces Round 334 (Div. 1) {603} | PROGRAMMING | Codeforces Round #334 Bonus Editorial: More Ideas on Div. 1 E | 2900 | |
| 10186 | Minimum spanning tree for each edge | data structures dfs and similar dsu graphs trees | Statement | E | Educational Codeforces Round 3 {609} | PROGRAMMING | Editorial | 2100 | |
| 678 | Clockwork Bomb | data structures dfs and similar dsu greedy trees | Statement | E | Codeforces Round 345 (Div. 1) {650} | PROGRAMMING | Codeforces Round #345: editorial | 3100 | |
| 7983 | New Reform | data structures dfs and similar dsu graphs greedy | Statement | E | Codeforces Round 346 (Div. 2) {659} | PROGRAMMING | Editorial for Codeforces Round #346 (Div. 2) | 1600 | |
| 3459 | Correct Bracket Sequence Editor | data structures dsu strings | Statement | E | Codeforces Round 350 (Div. 2) {670} | PROGRAMMING | Codeforces Round #350 (Div.2) Editorial | 1700 | |
| 1046 | Dividing Kingdom II | brute force data structures dsu graphs sortings | Statement | D | Codeforces Round 360 (Div. 1) {687} | PROGRAMMING | Codeforces Round #360 Editorial [+ Challenges!] | 2500 | |
| 626 | ...Wait for it... | data structures dsu trees | Statement | E | Codeforces Round 362 (Div. 1) {696} | PROGRAMMING | Codeforces Round #362 (Editorial) | 2900 | |
| 11427 | Destroying Array | data structures dsu | Statement | C | Intel Code Challenge Elimination Round (Div. 1 + Div. 2, combined) {722} | PROGRAMMING | Tutorial | 1600 | |
| 1295 | Drivers Dissatisfaction | data structures dsu graphs trees | Statement | F | Codeforces Round 378 (Div. 2) {733} | PROGRAMMING | Codeforces Round #378 (Div. 2) editorial | 2500 | |
| 551 | Timofey and our friends animals | data structures divide and conquer dsu | Statement | E | Codeforces Round 395 (Div. 1) {763} | PROGRAMMING | Codeforces Round #395 [Editorial] | 2800 | |
| 3891 | Mahmoud and a Dictionary | data structures dfs and similar dp dsu graphs | Statement | D | Codeforces Round 396 (Div. 2) {766} | PROGRAMMING | Codeforces round #396 editorial | 2000 | |
| 976 | Vladik and Entertaining Flags | data structures dsu graphs | Statement | E | Codeforces Round 416 (Div. 2) {811} | PROGRAMMING | Editorial | 2600 | |
| 1696 | Bipartite Checking | data structures dsu graphs | Statement | F | Educational Codeforces Round 22 {813} | PROGRAMMING | 52410 | 2600 | |
| 6217 | Imbalanced Array | data structures divide and conquer dsu sortings | Statement | D | Educational Codeforces Round 23 {817} | PROGRAMMING | 52638 | 2000 | |
| 2976 | Envy | data structures dsu graphs | Statement | C | Codeforces Round 446 (Div. 1) {891} | PROGRAMMING | Codeforces Round #446 Editorial | 2500 | |
| 2500 | Welcome home, Chtholly | data structures dsu | Statement | E | Codeforces Round 449 (Div. 1) {896} | PROGRAMMING | Codeforces Round #449 Editorial | 3100 | |
| 3512 | Segments Removal | data structures dsu flows implementation two pointers | Statement | E | Codeforces Round 452 (Div. 2) {899} | PROGRAMMING | Codeforces Round #452 (Div.2) Editorial | 2100 | |
| 1296 | Bipartite Segments | binary search data structures dfs and similar dsu graphs two pointers | Statement | C | Codeforces Round 453 (Div. 1) {901} | PROGRAMMING | Codeforces Round #453 (Div. 1 & Div. 2) Editorial | 2500 | |
| 3035 | Imbalance Value of a Tree | data structures dsu graphs trees | Statement | F | Educational Codeforces Round 36 (Rated for Div. 2) {915} | PROGRAMMING | 57123 | 2500 | |
| 8525 | SUM and REPLACE | brute force data structures dsu number theory | Statement | F | Educational Codeforces Round 37 (Rated for Div. 2) {920} | PROGRAMMING | T | 2000 | |
| 7681 | Connected Components? | data structures dfs and similar dsu graphs | Statement | E | Educational Codeforces Round 37 (Rated for Div. 2) {920} | PROGRAMMING | T | 2100 | |
| 252 | Iqea | data structures dfs and similar divide and conquer dsu shortest paths trees | Statement | E | Codeforces Round 467 (Div. 1) {936} | PROGRAMMING | Codeforces Round #467, Editorial | 3300 | |
| 1082 | Shortest Path Queries | bitmasks data structures dsu graphs | Statement | G | Educational Codeforces Round 38 (Rated for Div. 2) {938} | PROGRAMMING | Educational Codeforces Round 38 — Editorial | 2900 | |
| 207 | Visible Black Areas | data structures dsu geometry trees | Statement | G | Educational Codeforces Round 42 (Rated for Div. 2) {962} | PROGRAMMING | Educational Codeforces Round 42 Editorial | 2900 | |
| 2171 | Kuro and GCD and XOR and SUM | binary search bitmasks brute force data structures dp dsu greedy math number theory strings trees | Statement | D | Codeforces Round 482 (Div. 2) {979} | PROGRAMMING | 1750.0 | Codeforces Round #482 (Div. 2) Editorial | 2200 |
| 2510 | Shark | brute force data structures dsu trees | Statement | D | Codeforces Round 484 (Div. 2) {982} | PROGRAMMING | Editorial | 1900 | |
| 7683 | Dominant Indices | data structures dsu trees | Statement | F | Educational Codeforces Round 47 (Rated for Div. 2) {1009} | PROGRAMMING | 60630 | 2300 | |
| 1466 | Leaf Sets | data structures dfs and similar dsu graphs greedy sortings trees | Statement | F | Codeforces Round 510 (Div. 2) {1042} | PROGRAMMING | Tutorial | 2400 | |
| 1183 | Deduction Queries | data structures dsu | Statement | D | Lyft Level 5 Challenge 2018 - Final Round {1044} | PROGRAMMING | Lyft Level 5 Challenge 2018 — Final Round — Editorial | 2600 | |
| 480 | Distinctification | data structures dsu greedy | Statement | G | Educational Codeforces Round 51 (Rated for Div. 2) {1051} | PROGRAMMING | Educational Codeforces Round 51 Editorial | 2700 | |
| 1240 | Vasya and Maximum Profit | binary search constructive algorithms data structures dp dsu | Statement | G | Educational Codeforces Round 59 (Rated for Div. 2) {1107} | PROGRAMMING | Educational Codeforces Round 59 Editorial | 2400 | |
| 1545 | Extending Set of Points | data structures divide and conquer dsu | Statement | F | Educational Codeforces Round 62 (Rated for Div. 2) {1140} | PROGRAMMING | Educational Codeforces Round 62 Editorial | 2700 | |
| 4003 | Special Segments of Permutation | data structures divide and conquer dsu two pointers | Statement | E | Educational Codeforces Round 64 (Rated for Div. 2) {1156} | PROGRAMMING | 66827 | 2400 | |
| 811 | Vicky's Delivery Service | data structures dsu graphs hashing | Statement | F | Codeforces Round 561 (Div. 2) {1166} | PROGRAMMING | Codeforces Round #561 (Div. 2) Editorial | 2800 | |
| 664 | Daleks' Invasion (hard) | data structures dsu graphs trees | Statement | E3 | Helvetic Coding Contest 2019 online mirror (teams allowed, unrated) {1184} | PROGRAMMING | helvetic-coding-contest-2019-editorial.pdf | 2500 | |
| 3934 | Into Blocks (easy version) | data structures dsu greedy implementation two pointers | Statement | G1 | Codeforces Round 584 - Dasha Code Championship - Elimination Round (rated, open for everyone, Div. 1 + Div. 2) {1209} | PROGRAMMING | 69791 | 2000 | |
| 3013 | Unstable String Sort | data structures dfs and similar dsu graphs greedy implementation strings | Statement | F | Codeforces Round 582 (Div. 3) {1213} | PROGRAMMING | Codeforces Round #582 (Div. 3) Editorial | 2400 | |
| 716 | Forced Online Queries Problem | data structures divide and conquer dsu graphs trees | Statement | F | Educational Codeforces Round 72 (Rated for Div. 2) {1217} | PROGRAMMING | Educational Codeforces Round 72 Editorial | 2800 | |
| 730 | Alice and the Unfair Game | binary search data structures dp dsu | Statement | E | Codeforces Round 593 (Div. 2) {1236} | PROGRAMMING | 70654 | 2600 | |
| 4320 | Segment Tree | data structures dsu graphs trees | Statement | D | Educational Codeforces Round 78 (Rated for Div. 2) {1278} | PROGRAMMING | Educational Codeforces Round 78 Editorial | 2100 | |
| 13846 | NEKO's Maze Game | data structures dsu implementation | Statement | A | Codeforces Round 614 (Div. 1) {1292} | PROGRAMMING | 500.0 | Codeforces Round #614 Editorial | 1400 |
| 2411 | Robots on a Grid | data structures dfs and similar dsu graphs greedy matrices | Statement | F | Codeforces Round 634 (Div. 3) {1335} | PROGRAMMING | 75993 | 2600 | |
| 2406 | Merging Towers | data structures dsu implementation trees | Statement | E | Educational Codeforces Round 91 (Rated for Div. 2) {1380} | PROGRAMMING | Educational Codeforces Round 91 Editorial | ||
| 654 | Joker | *special bitmasks data structures divide and conquer dsu | Statement | C | Baltic Olympiad in Informatics 2020, Day 1 (IOI, Unofficial Mirror Contest, Unrated) {1386} | PROGRAMMING | T | ||
| 1384 | Controversial Rounds | binary search data structures dp dsu two pointers | Statement | F | Educational Codeforces Round 93 (Rated for Div. 2) {1398} | PROGRAMMING | Educational Codeforces Round 93 Editorial | ||
| 1349 | Fancy Fence | *special data structures dp dsu math sortings | Statement | A | Central-European Olympiad in Informatics, CEOI 2020, Day 1 (IOI, Unofficial Mirror Contest, Unrated) {1402} | PROGRAMMING | Editorial | ||
| 2693 | Graph and Queries | data structures dfs and similar dsu graphs trees | Statement | D | Codeforces Round 673 (Div. 1) {1416} | PROGRAMMING | 2000.0 | Codeforces Round #673 Editorial | 2600 |
| 623 | Virus | data structures dsu graphs | Statement | H | Bubble Cup 13 - Finals [Online Mirror, unrated, Div. 1] {1423} | PROGRAMMING | FinalsEditorial2020.pdf | ||
| 5230 | Identify the Operations | brute force combinatorics data structures dsu greedy implementation | Statement | B | Codeforces Round 681 (Div. 1, based on VK Cup 2019-2020 - Final) {1442} | PROGRAMMING | 1000.0 | 84298 | |
| 6596 | Number of Simple Paths | combinatorics data structures dfs and similar dsu graphs trees | Statement | E | Codeforces Round 686 (Div. 3) {1454} | PROGRAMMING | Codeforces Round #686 (Div. 3) Editorial | ||
| 241 | Bakery | data structures dsu | Statement | B | 2020-2021 ICPC, NERC, Southern and Volga Russian Regional Contest (Online Mirror, ICPC Rules) {1468} | PROGRAMMING | Tutorial (PDF) | ||
| 4110 | Playlist | data structures dsu implementation | Statement | D | Технокубок 2021 - Финал {1482} | PROGRAMMING | 2000.0 | Technocup 2021: Final Round and Codeforces Round #709 — tutorial | |
| 1353 | Playlist | data structures dsu implementation two pointers | Statement | B | Codeforces Round 709 (Div. 1, based on Technocup 2021 Final Round) {1483} | PROGRAMMING | 1000.0 | Technocup 2021: Final Round and Codeforces Round #709 — tutorial | |
| 1255 | Flip the Cards | 2-sat constructive algorithms data structures dsu greedy sortings | Statement | D | Codeforces Round 712 (Div. 1) {1503} | PROGRAMMING | 1750.0 | T | 2600 |
| 14176 | Restoring the Permutation | constructive algorithms data structures dsu greedy | Statement | E | Codeforces Round 710 (Div. 3) {1506} | PROGRAMMING | Editorial | ||
| 1721 | Complete the MST | data structures dfs and similar dsu graphs greedy math | Statement | C | Codeforces Round 715 (Div. 1) {1508} | PROGRAMMING | 1500.0 | Codeforces Round #715 Editorial | |
| 6451 | GCD and MST | constructive algorithms data structures dsu graphs implementation number theory sortings | Statement | D | Divide by Zero 2021 and Codeforces Round 714 (Div. 2) {1513} | PROGRAMMING | 2000.0 | Divide by Zero 2021 and Codeforces Round #714 (Div. 2) Editorial | |
| 895 | Jumping Around | data structures divide and conquer dp dsu graphs shortest paths trees | Statement | F | Educational Codeforces Round 111 (Rated for Div. 2) {1550} | PROGRAMMING | Educational Codeforces Round 111 Editorial | ||
| 1043 | Good Graph | data structures dsu graphs trees | Statement | F | Educational Codeforces Round 112 (Rated for Div. 2) {1555} | PROGRAMMING | 93389 | 2700 | |
| 473 | Building Forest Trails | data structures dsu | Statement | B | ICPC WF Moscow Invitational Contest - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1578} | PROGRAMMING | Tutorial (PDF) | ||
| 661 | Tree Queries | binary search data structures dp dsu geometry trees | Statement | F | Educational Codeforces Round 116 (Rated for Div. 2) {1606} | PROGRAMMING | 96454 | ||
| 1922 | Trader Problem | binary search data structures dsu greedy math sortings | Statement | G | Codeforces Round 760 (Div. 3) {1618} | PROGRAMMING | Codeforces Round #760 (Div. 3) Editorial | ||
| 9622 | Replace the Numbers | data structures dsu greedy trees | Statement | E | Educational Codeforces Round 119 (Rated for Div. 2) {1620} | PROGRAMMING | 98061 | ||
| 1736 | Spanning Tree Queries | binary search data structures dsu graphs implementation math sortings | Statement | E | Educational Codeforces Round 122 (Rated for Div. 2) {1633} | PROGRAMMING | 99539 | ||
| 2837 | Anonymity Is Important | binary search data structures dsu sortings | Statement | C | Codeforces Round 773 (Div. 1) {1641} | PROGRAMMING | 1250.0 | Codeforces Round #773 editorial | |
| 504 | Air Reform | data structures dfs and similar divide and conquer dsu graphs implementation trees | Statement | E | Codeforces Round 775 (Div. 1, based on Moscow Open Olympiad in Informatics) {1648} | PROGRAMMING | 2500.0 | Codeforces Round #775 Editorial | |
| 1962 | AND-MEX Walk | bitmasks brute force data structures dfs and similar dsu graphs greedy | Statement | E | Codeforces Round 782 (Div. 2) {1659} | PROGRAMMING | 2250.0 | Codeforces Round #782 (Div. 2) Editorial | |
| 1119 | Narrow Components | data structures dfs and similar dsu trees | Statement | E | Educational Codeforces Round 126 (Rated for Div. 2) {1661} | PROGRAMMING | Educational Codeforces Round 126 Editorial | ||
| 10978 | Where is the Pizza? | data structures dfs and similar dsu graphs implementation math | Statement | C | Codeforces Round 788 (Div. 2) {1670} | PROGRAMMING | 1750.0 | Tutorial | 1400 |
| 895 | Lenient Vertex Cover | data structures dfs and similar divide and conquer dsu graphs | Statement | F | Educational Codeforces Round 128 (Rated for Div. 2) {1680} | PROGRAMMING | 102852 | ||
| 2290 | Unique Occurrences | data structures dfs and similar divide and conquer dp dsu trees | Statement | F | Educational Codeforces Round 129 (Rated for Div. 2) {1681} | PROGRAMMING | 103163 | 2300 | |
| 1677 | Sanae and Giant Robot | brute force constructive algorithms data structures dfs and similar dsu | Statement | C | Codeforces Round 796 (Div. 1) {1687} | PROGRAMMING | 1500.0 | Editorial of Codeforces Round 796 | |
| 2091 | Number of Groups | data structures dfs and similar dsu graphs greedy sortings | Statement | E | CodeCraft-22 and Codeforces Round 795 (Div. 2) {1691} | PROGRAMMING | 2250.0 | Editorial for CodeCraft-22 and Codeforces Round #795 (Div. 2) | |
| 3687 | Qpwoeirut and Vertices | binary search data structures dsu trees | Statement | E | Codeforces Round 809 (Div. 2) {1706} | PROGRAMMING | 2250.0 | Codeforces Round #809 Editorial | |
| 1893 | DFS Trees | data structures dfs and similar dsu graphs greedy trees | Statement | C | Codeforces Round 808 (Div. 1) {1707} | PROGRAMMING | 1250.0 | 104930 | |
| 3928 | XOR Tree | data structures dfs and similar dsu greedy trees | Statement | E | Educational Codeforces Round 132 (Rated for Div. 2) {1709} | PROGRAMMING | 105164 | ||
| 777 | Kingdom of Criticism | data structures dsu | Statement | K | COMPFEST 14 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1725} | PROGRAMMING | Tutorial | ||
| 13391 | Jatayu's Balanced Bracket Sequence | data structures dsu graphs | Statement | C | Codeforces Round 819 (Div. 1 + Div. 2) and Grimoire of Code Annual Contest 2022 {1726} | PROGRAMMING | 1500.0 | Codeforces Round #819 (Div. 1 + Div. 2) and Grimoire of Code Annual Contest 2022 Editorial | |
| 4388 | Koxia and Game | data structures dfs and similar dsu games graph matchings graphs implementation | Statement | D | Good Bye 2022: 2023 is NEAR {1770} | PROGRAMMING | 1500.0 | Good Bye 2022 -- Editorial | |
| 3850 | The Human Equation | data structures dp dsu greedy | Statement | E | Codeforces Round 843 (Div. 2) {1775} | PROGRAMMING | 2250.0 | Codeforces Round #843 (Div. 2) Editorial | |
| 1334 | Comfortably Numb | binary search bitmasks data structures divide and conquer dsu strings trees two pointers | Statement | F | Codeforces Round 845 (Div. 2) and ByteRace 2023 {1777} | PROGRAMMING | 2750.0 | Codeforces Round #845 (Div. 2) and ByteRace 2023 Editorial | |
| 9021 | Boris and His Amazing Haircut | constructive algorithms data structures dp dsu greedy | Statement | D | Hello 2023 {1779} | PROGRAMMING | 1500.0 | ||
| 560 | Li Hua and Path | data structures dfs and similar divide and conquer dsu trees | Statement | F | Codeforces Round 864 (Div. 2) {1797} | PROGRAMMING | 3000.0 | Codeforces Round 864 (Div. 2) Editorial | |
| 614 | Gasoline prices | data structures divide and conquer dsu trees | Statement | E | Codeforces Round 857 (Div. 1) {1801} | PROGRAMMING | 2500.0 | Codeforces Round #857 Editorial | |
| 1902 | There Should Be a Lot of Maximums | data structures dfs and similar dsu graphs trees | Statement | E | Codeforces Round 862 (Div. 2) {1805} | PROGRAMMING | 2250.0 | Editorial of Codeforces Round #862 (Div. 2) | |
| 3896 | Monsters | brute force data structures dfs and similar dsu graphs implementation trees | Statement | E | CodeTON Round 4 (Div. 1 + Div. 2, Rated, Prizes!) {1810} | PROGRAMMING | 2000.0 | Editorial of CodeTON Round 4 (Div. 1 + Div. 2, Rated, Prizes!) | |
| 1679 | LuoTianyi and XOR-Tree | data structures dfs and similar dp dsu greedy trees | Statement | C | Codeforces Round 872 (Div. 1) {1824} | PROGRAMMING | 1750.0 | CodeForces Round 872(Div. 1&2) Editorial | 2500 |
| 4254 | Professor Higashikata | brute force data structures dsu greedy implementation sortings | Statement | D | Codeforces Round 882 (Div. 2) {1847} | PROGRAMMING | 2000.0 | Tutorial | |
| 2174 | Max to the Right of Min | binary search data structures divide and conquer dsu two pointers | Statement | E | Educational Codeforces Round 152 (Rated for Div. 2) {1849} | PROGRAMMING | 118752 | ||
| 4018 | Vlad and the Mountains | data structures dsu graphs implementation sortings trees two pointers | Statement | G | Codeforces Round 888 (Div. 3) {1851} | PROGRAMMING | 118667 | ||
| 7977 | Andrey and Escape from Capygrad | binary search data structures dp dsu greedy sortings two pointers | Statement | D | Codeforces Round 892 (Div. 2) {1859} | PROGRAMMING | 1750.0 | Video solutions from Geothermal. | |
| 3999 | Unusual Entertainment | data structures dfs and similar dsu shortest paths sortings trees | Statement | G | Codeforces Round 909 (Div. 3) {1899} | PROGRAMMING | Разбор Codeforces Round 909 (Div. 3) | ||
| 5666 | Set To Max (Hard Version) | binary search constructive algorithms data structures dsu greedy implementation sortings two pointers | Statement | D2 | Codeforces Round 914 (Div. 2) {1904} | PROGRAMMING | 750.0 | Codeforces Round 914 (Div. 2) Editorial | |
| 13137 | Heavy Intervals | constructive algorithms data structures dsu greedy math sortings | Statement | C | Pinely Round 3 (Div. 1 + Div. 2) {1909} | PROGRAMMING | 1500.0 | Editorial of Pinely Round 3 (Div. 1 + Div. 2) | |
| 1805 | 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 | ||
| 1190 | Smooth Sailing (Easy Version) | binary search data structures dfs and similar dsu graphs | Statement | F1 | Codeforces Round 919 (Div. 2) {1920} | PROGRAMMING | 2500.0 | Editorial for Codeforces Round #919 (Div. 2) | |
| 641 | Smooth Sailing (Hard Version) | binary search data structures dsu graphs trees | Statement | F2 | Codeforces Round 919 (Div. 2) {1920} | PROGRAMMING | 2500.0 | Editorial for Codeforces Round #919 (Div. 2) | |
| 5114 | Count Paths | data structures dfs and similar divide and conquer dp dsu trees | Statement | E | Educational Codeforces Round 162 (Rated for Div. 2) {1923} | PROGRAMMING | Educational Codeforces Round 162 Editorial | ||
| 5360 | Microcycle | data structures dfs and similar dsu graphs greedy trees | Statement | F | Codeforces Round 923 (Div. 3) {1927} | PROGRAMMING | 125597 | ||
| 43 | Burenka and Pether | *special data structures dfs and similar divide and conquer dsu graphs sortings trees | Statement | C | XVIII Open Olympiad in Informatics - Final Stage, Day 2 (Unrated, Online Mirror, IOI rules) {1940} | PROGRAMMING | |||
| 2955 | Chain Reaction | data structures dsu greedy implementation math number theory | Statement | E | Educational Codeforces Round 164 (Rated for Div. 2) {1954} | PROGRAMMING | Educational Codeforces Round 164 Editorial | ||
| 481 | Nene and the Passing Game | constructive algorithms data structures dsu graphs sortings | Statement | F | Codeforces Round 939 (Div. 2) {1956} | PROGRAMMING | 2500.0 | [Editorial] Codeforces Round 939 (Div. 2) | |
| 11447 | XOUR | data structures dsu sortings | Statement | G | Codeforces Round 944 (Div. 4) {1971} | PROGRAMMING | Codeforces Round 944 (Div. 4) Editorial | 1400 | |
| 1569 | Large Graph | data structures dsu graphs number theory | Statement | F | Codeforces Round 953 (Div. 2) {1978} | PROGRAMMING | 2500.0 | 130527 | |
| 1214 | Turtle and Intersected Segments | data structures dsu graphs greedy | Statement | E | Codeforces Round 949 (Div. 2) {1981} | PROGRAMMING | 2500.0 | Simplified Chinese Tutorial | |
| 7206 | Maximize the Largest Component (Easy Version) | brute force data structures dfs and similar dsu graphs implementation | Statement | H1 | Codeforces Round 952 (Div. 4) {1985} | PROGRAMMING | Codeforces Round 952 (Div. 4) Editorial | ||
| 1900 | Maximize the Largest Component (Hard Version) | data structures dfs and similar dsu implementation | Statement | H2 | Codeforces Round 952 (Div. 4) {1985} | PROGRAMMING | Codeforces Round 952 (Div. 4) Editorial | ||
| 4333 | Iris and the Tree | brute force data structures dfs and similar dsu math trees | Statement | B | Codeforces Round 969 (Div. 1) {2006} | PROGRAMMING | 1250.0 | Tutorial | |
| 237 | Complex Segments (Easy Version) | binary search data structures divide and conquer dsu greedy math sortings | Statement | E1 | Codeforces Round 975 (Div. 1) {2018} | PROGRAMMING | 2250.0 | Editorial of Codeforces Round 975 (Div. 1, Div. 2) | |
| 203 | Complex Segments (Hard Version) | binary search data structures divide and conquer dsu greedy math sortings | Statement | E2 | Codeforces Round 975 (Div. 1) {2018} | PROGRAMMING | 750.0 | Editorial of Codeforces Round 975 (Div. 1, Div. 2) | |
| 2182 | Max Plus Min Plus Size | data structures dp dsu greedy implementation matrices | Statement | D | Codeforces Round 975 (Div. 1) {2018} | PROGRAMMING | 1500.0 | Editorial of Codeforces Round 975 (Div. 1, Div. 2) | |
| 1918 | Digital Village (Easy Version) | brute force data structures dp dsu graphs greedy implementation math shortest paths trees | Statement | E1 | Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round) {2021} | PROGRAMMING | 1750.0 | Codeforces Round #977 (Div. 2, based on COMPFEST 16 — Final Round) Editorial | |
| 1198 | Digital Village (Hard Version) | data structures dp dsu graphs math trees | Statement | E2 | Codeforces Round 977 (Div. 2, based on COMPFEST 16 - Final Round) {2021} | PROGRAMMING | 750.0 | Codeforces Round #977 (Div. 2, based on COMPFEST 16 — Final Round) Editorial | |
| 3906 | Cool Graph | constructive algorithms data structures dfs and similar dsu graphs trees | Statement | D | Refact.ai Match 1 (Codeforces Round 985) {2029} | PROGRAMMING | 2250.0 | Refact.ai Match 1 (Codeforces Round 985) Editorial | |
| 9642 | Penchick and Desert Rabbit | data structures dfs and similar dp dsu greedy two pointers | Statement | D | Codeforces Round 987 (Div. 2) {2031} | PROGRAMMING | 2000.0 | Codeforces Round 987 (Div. 2) Editorial | |
| 14084 | Sakurako, Kosuke, and the Permutation | brute force data structures dfs and similar dsu fft greedy math | Statement | E | Codeforces Round 981 (Div. 3) {2033} | PROGRAMMING | 135520 | ||
| 1520 | 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 | |
| 924 | 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 | |
| 2343 | Triangle Tree | data structures dfs and similar dp dsu greedy trees | Statement | E | Codeforces Round 1000 (Div. 2) {2063} | PROGRAMMING | 2750.0 | Codeforces Round 1000 (Div. 2) — Editorial | |
| 1456 | Mycraft Sand Sort | combinatorics data structures dsu | Statement | E | Codeforces Round 1005 (Div. 2) {2064} | PROGRAMMING | 2250.0 | Codeforces Round 1005 (Div. 2) Editorial | |
| 362 | Porto Vs. Benfica | data structures dfs and similar dsu graphs shortest paths | Statement | E | European Championship 2025 - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {2068} | PROGRAMMING | 140239 | ||
| 754 | Graph Inclusion | data structures divide and conquer dsu | Statement | F | Educational Codeforces Round 174 (Rated for Div. 2) {2069} | PROGRAMMING | 139774 | ||
| 522 | Modulo 3 | data structures divide and conquer dsu trees | Statement | G | Educational Codeforces Round 178 (Rated for Div. 2) {2104} | PROGRAMMING | Educational Codeforces Round 178 Editorial | ||
| 14566 | Neo's Escape | data structures dsu graphs greedy implementation | Statement | C | Codeforces Round 1022 (Div. 2) {2108} | PROGRAMMING | 1500.0 | Codeforces Round 1022 Editorial | |
| 2721 | Ancient Tree | constructive algorithms data structures dfs and similar dsu greedy trees | Statement | E | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} | PROGRAMMING | 2500.0 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial | |
| 625 | Juan's Colorful Tree | data structures data structures dfs and similar dfs and similar dsu graphs graphs trees | Statement | F | Codeforces Round 1056 (Div. 2) {2155} | PROGRAMMING | 3000.0 | Codeforces Round 1056 (Div. 2) Editorial | |
| 3538 | Adjusting Drones | binary search data structures dsu greedy implementation sortings | Statement | E | Codeforces Round 1066 (Div. 1 + Div. 2) {2157} | PROGRAMMING | 2000.0 | Codeforces Round 1066 (Div. 1 + Div. 2) Editorial | |
| 612 | Sink | data structures dsu dsu graphs graphs | Statement | E | Codeforces Round 1067 (Div. 2) {2158} | PROGRAMMING | 2750.0 | Codeforces Round 1067 (Div. 2) Editorial | |
| 2295 | Rectangles | data structures dsu implementation two pointers | Statement | B | Codeforces Round 1058 (Div. 1) {2159} | PROGRAMMING | 1500.0 | Codeforces Round 1058 Editorial | |
| 7038 | Rae Taylor and Trees (hard version) | binary search constructive algorithms data structures dp dsu implementation trees | Statement | F | Codeforces Round 1065 (Div. 3) {2171} | PROGRAMMING | Codeforces Round 1065 (Div. 3) Editorial | ||
| 11420 | Rae Taylor and Trees (easy version) | binary search data structures dp dsu greedy implementation trees | Statement | D | Codeforces Round 1065 (Div. 3) {2171} | PROGRAMMING | Codeforces Round 1065 (Div. 3) Editorial | ||
| 5672 | Exquisite Array | combinatorics data structures dsu | Statement | E | Codeforces Round 1072 (Div. 3) {2184} | PROGRAMMING | Codeforces Round 1072 (Div. 3) Editorial | ||
| 615 | Simons and Reconstructing His Roads | constructive algorithms data structures dsu graphs meet-in-the-middle | Statement | F | Codeforces Round 1083 (Div. 2) {2205} | PROGRAMMING | 2750.0 | Tutorial | |
| 1745 | Tree Orientation (Hard Version) | data structures dfs and similar dsu graphs greedy matrices sortings trees | Statement | D2 | Codeforces Round 1086 (Div. 2) {2208} | PROGRAMMING | 1250.0 | Tutorial |