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 |
|---|---|---|---|---|---|---|---|---|---|
| 1627 | First Digit Law | dp math probabilities | Statement | C | Codeforces Beta Round 50 {54} | PROGRAMMING | Codeforces Beta Round #50: Editorial for problem E | 2000 | |
| 531 | Half-decay tree | data structures divide and conquer dp math probabilities | Statement | D | Codeforces Beta Round 62 {68} | PROGRAMMING | 2400 | ||
| 558 | Help Shrek and Donkey | dp games math probabilities | Statement | E | Codeforces Beta Round 78 (Div. 1 Only) {98} | PROGRAMMING | Editorial | 2500 | |
| 4243 | Basketball Team | combinatorics dp math probabilities | Statement | B | Codeforces Beta Round 83 (Div. 1 Only) {107} | PROGRAMMING | Tutorial | 1700 | |
| 8845 | Bag of mice | dp games math probabilities | Statement | D | Codeforces Round 105 (Div. 2) {148} | PROGRAMMING | Codeforces Round #105 (Div. 2): editorial | 1900 | |
| 2443 | Wizards and Huge Prize | dp math probabilities | Statement | B | Codeforces Round 114 (Div. 1) {167} | PROGRAMMING | Codeforces Round #114 — Tutorial | 2000 | |
| 317 | Plane of Tanks: Duel | brute force dp math probabilities | Statement | D | Codeforces Round 115 {175} | PROGRAMMING | Codeforces Round #115 — editorial A-E | 2400 | |
| 524 | Gifts | combinatorics dp math probabilities | Statement | E | Codeforces Round 142 (Div. 1) {229} | PROGRAMMING | Codeforces Round #142 Problem Analysis | 2500 | |
| 4285 | Let's Play Osu! | dp math probabilities | Statement | B | Codeforces Round 146 (Div. 1) {235} | PROGRAMMING | Codeforces Round #146 Tutorial | 2100 | |
| 639 | Piglet's Birthday | dp math probabilities | Statement | E | Codeforces Round 152 (Div. 2) {248} | PROGRAMMING | Разбор задач Codeforces Round #152 | 2700 | |
| 1414 | Little Elephant and Broken Sorting | dp math probabilities | Statement | D | Codeforces Round 157 (Div. 1) {258} | PROGRAMMING | Codeforces Round #157 — Editorial | 2600 | |
| 1600 | Maxim and Restaurant | dp math probabilities | Statement | B | Codeforces Round 160 (Div. 1) {261} | PROGRAMMING | Codeforces Round #160 tutorial | 2100 | |
| 383 | Random Ranking | dp math probabilities | Statement | E | Codeforces Round 183 (Div. 1) {303} | PROGRAMMING | Codeforces Round #183 Editorial | 2800 | |
| 241 | Counting Skyscrapers | dp math probabilities | Statement | E | MemSQL start[c]up Round 2 - online version {335} | PROGRAMMING | MemSQL start[c]up Round 2 -- Editorial | 2900 | |
| 815 | Valera and Number | bitmasks dp math probabilities | Statement | E | Codeforces Round 252 (Div. 2) {441} | PROGRAMMING | Разбор Codeforces Round #252 (Div. 2) | 2700 | |
| 36817 | Dreamoon and WiFi | bitmasks brute force combinatorics dp math probabilities | Statement | B | Codeforces Round 272 (Div. 2) {476} | PROGRAMMING | 1300 | ||
| 8129 | Ilya and Escalator | combinatorics dp math probabilities | Statement | D | Codeforces Round 293 (Div. 2) {518} | PROGRAMMING | Codeforces Round #293 (Div.2) Editorial | 1900 | |
| 620 | Kyoya and Train | dp fft graphs math probabilities | Statement | E | Codeforces Round 309 (Div. 1) {553} | PROGRAMMING | Codeforces Round #309 Editorial | 3300 | |
| 728 | Wilbur and Trees | dp math probabilities sortings | Statement | D | Codeforces Round 331 (Div. 2) {596} | PROGRAMMING | Codeforces Round #331 Editorial | 2500 | |
| 1411 | Kleofáš and the n-thlon | dp math probabilities | Statement | C | Codeforces Round 333 (Div. 1) {601} | PROGRAMMING | Codeforces Round #333 — editorial | 2400 | |
| 271 | Combining Slimes | dp math matrices probabilities | Statement | G | Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) {618} | PROGRAMMING | Wunder Fund Round 2016 Editorials | 3300 | |
| 1570 | Little Artem and Random Variable | dp implementation math probabilities | Statement | D | VK Cup 2016 - Round 2 {641} | PROGRAMMING | VK Cup 2016 — Раунд 2 (editorial) | 2300 | |
| 698 | Bear and Destroying Subtrees | dp math probabilities trees | Statement | E | VK Cup 2016 - Round 3 {643} | PROGRAMMING | VK Cup 2016 — Round 3 — Editorial | 2600 | |
| 1439 | LRU | bitmasks dp math probabilities | Statement | C | Codeforces Round 363 (Div. 1) {698} | PROGRAMMING | Solution | 2700 | |
| 2617 | Gosha is hunting | brute force data structures dp flows math probabilities sortings | Statement | E | Codeforces Round 381 (Div. 1) {739} | PROGRAMMING | 48582 | 2900 | |
| 3417 | Jon and Orbs | dp math probabilities | Statement | D | Divide by Zero 2017 and Codeforces Round 399 (Div. 1 + Div. 2, combined) {768} | PROGRAMMING | Editorial Divide by Zero and Codeforces Round #399 (Div. 1+2, combined) | 2100 | |
| 2600 | New Year and Arbitrary Arrangement | dp math probabilities | Statement | D | Good Bye 2017 {908} | PROGRAMMING | Good Bye 2017 Editorial | 2200 | |
| 764 | Strongly Connected Tournament | dp graphs math probabilities | Statement | F | Hello 2018 {913} | PROGRAMMING | Tutorial | 2700 | |
| 2077 | Vasya and Magic Matrix | dp math probabilities | Statement | E | Codeforces Round 510 (Div. 2) {1042} | PROGRAMMING | Tutorial | 2300 | |
| 490 | Computer Game | dp greedy math probabilities | Statement | D | Codeforces Round 518 (Div. 1) [Thanks, Mail.Ru!] {1067} | PROGRAMMING | Tutorial | 2800 | |
| 2057 | Inversion Expectation | dp math probabilities | Statement | F | Educational Codeforces Round 57 (Rated for Div. 2) {1096} | PROGRAMMING | Разбор Educational Codeforces Round 57 | 2300 | |
| 1277 | The Top Scorer | combinatorics dp math probabilities | Statement | E | Educational Codeforces Round 57 (Rated for Div. 2) {1096} | PROGRAMMING | Разбор Educational Codeforces Round 57 | 2600 | |
| 3163 | Makoto and a Blackboard | dp math number theory probabilities | Statement | D | Hello 2019 {1097} | PROGRAMMING | 64310 | 2200 | |
| 2694 | Steps to One | dp math number theory probabilities | Statement | D | Codeforces Round 548 (Div. 2) {1139} | PROGRAMMING | Codeforces Round #548 Editorial | 2300 | |
| 929 | Serval and Bonus Problem | combinatorics dp math probabilities | Statement | F | Codeforces Round 551 (Div. 2) {1153} | PROGRAMMING | Editorial | 2800 | |
| 1712 | Card Bag | dp math probabilities | Statement | F | Educational Codeforces Round 64 (Rated for Div. 2) {1156} | PROGRAMMING | 66827 | 2500 | |
| 1110 | Expected Square Beauty | dp math probabilities | Statement | F | Educational Codeforces Round 67 (Rated for Div. 2) {1187} | PROGRAMMING | Разбор Educational Codeforces Round 67 | 2600 | |
| 4492 | Beautiful Mirrors | data structures dp math probabilities | Statement | E | Codeforces Round 604 (Div. 2) {1265} | PROGRAMMING | Codeforces Round #604 Editorial | 2100 | |
| 2470 | Cards | combinatorics dp math number theory probabilities | Statement | F | Educational Codeforces Round 78 (Rated for Div. 2) {1278} | PROGRAMMING | Educational Codeforces Round 78 Editorial | 2600 | |
| 8802 | Bargain | dp math probabilities | Statement | C | Codeforces Round 675 (Div. 2) {1422} | PROGRAMMING | 1000.0 | Codeforces Round #675 (Div. 2) Editorial | |
| 264 | School Clubs | dp fft math number theory probabilities | Statement | E | Codeforces Round 700 (Div. 1) {1479} | PROGRAMMING | 4000.0 | Editorial of Codeforces Round #700 | |
| 2365 | Assimilation IV | combinatorics dp math probabilities | Statement | E | Educational Codeforces Round 109 (Rated for Div. 2) {1525} | PROGRAMMING | 90793 | ||
| 2983 | Tree Array | brute force combinatorics dp math probabilities trees | Statement | B | Codeforces Round 728 (Div. 1) {1540} | PROGRAMMING | 1250.0 | Tutorial | |
| 1415 | Sports Betting | bitmasks combinatorics dp graphs math probabilities | Statement | F | Deltix Round, Summer 2021 (open for everyone, rated, Div. 1 + Div. 2) {1556} | PROGRAMMING | 2500.0 | 94384 | 2500 |
| 1467 | Robot Cleaner Revisit | dp implementation math probabilities | Statement | D | Codeforces Round 763 (Div. 2) {1623} | PROGRAMMING | 2500.0 | Codeforces Round #763 (Div. 2) Editorial | |
| 5255 | Wish I Knew How to Sort | dp math probabilities | Statement | C | Codeforces Round 829 (Div. 1) {1753} | PROGRAMMING | 1750.0 | Tutorial | 2000 |
| 1607 | Koxia and Tree | combinatorics dp math probabilities trees | Statement | E | Good Bye 2022: 2023 is NEAR {1770} | PROGRAMMING | 2000.0 | Good Bye 2022 -- Editorial | |
| 545 | Game of Questions | bitmasks dp math probabilities | Statement | G | 2022-2023 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1773} | PROGRAMMING | 2800 | ||
| 3388 | Flexible String Revisit | combinatorics dp math probabilities | Statement | D | Codeforces Round 848 (Div. 2) {1778} | PROGRAMMING | 1750.0 | Codeforces Round #848 (Div. 2) Editorial | |
| 1283 | Random Walk | dp graphs math probabilities trees | Statement | F | Codeforces Round 868 (Div. 2) {1823} | PROGRAMMING | 2500.0 | 115465 | |
| 274 | Old Mobile | dp math probabilities | Statement | E | Codeforces Round 880 (Div. 1) {1835} | PROGRAMMING | 2250.0 | Codeforces Round 880 Editorial | |
| 1568 | 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 | |
| 1777 | Expected Destruction | dp math probabilities | Statement | C | Codeforces Round 889 (Div. 1) {1854} | PROGRAMMING | 1500.0 | Editorial of Codeforces Round 889 (Div. 1 + Div. 2) | |
| 492 | Asterism Stream | dp math matrices probabilities | Statement | H | Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) {1864} | PROGRAMMING | 3500.0 | Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) Editorial | |
| 967 | 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 | ||
| 2169 | Jellyfish and EVA | dp graphs greedy math probabilities | Statement | C | Codeforces Round 901 (Div. 1) {1874} | PROGRAMMING | 1500.0 | Codeforces Round 901 (Div. 1, Div. 2) Editorial | |
| 927 | Jellyfish and Miku | dp math probabilities | Statement | D | Codeforces Round 901 (Div. 1) {1874} | PROGRAMMING | 2250.0 | Codeforces Round 901 (Div. 1, Div. 2) Editorial | |
| 4756 | 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 | |
| 3963 | Expected Power | bitmasks brute force dp math number theory probabilities | Statement | E | Codeforces Round 976 (Div. 2) and Divide By Zero 9.0 {2020} | PROGRAMMING | 2000.0 | Tutorial for Codeforces Round 976 (Div. 2) and Divide By Zero 9.0 | |
| 1892 | Alice's Adventures in the Rabbit Hole | constructive algorithms dfs and similar dp greedy math probabilities trees | Statement | E | Codeforces Round 986 (Div. 2) {2028} | PROGRAMMING | 2000.0 | Codeforces Round 986 (Div. 2) Editorial | |
| 4053 | Math Division | bitmasks dp math probabilities | Statement | A | Codeforces Round 1010 (Div. 1, Unrated) {2081} | PROGRAMMING | 500.0 | Codeforces Round 1010 (Div. 1, Div. 2, based on Zhili Cup 2025) Editorial | |
| 1400 | Key of Like (Easy Version) | dp math probabilities | Statement | C1 | Codeforces Round 1012 (Div. 1) {2089} | PROGRAMMING | 1000.0 | Codeforces Round 1012 (Div.1, Div. 2, based on THUPC 2025 — Finals) Editorial | |
| 254 | Key of Like (Hard Version) | dp math probabilities | Statement | C2 | Codeforces Round 1012 (Div. 1) {2089} | PROGRAMMING | 1250.0 | Codeforces Round 1012 (Div.1, Div. 2, based on THUPC 2025 — Finals) Editorial | |
| 903 | 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 | |
| 697 | Jinx or Jackpot | brute force dp math probabilities | Statement | J | 2025-2026 ICPC, NERC, Northern Eurasia Finals (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {2181} | PROGRAMMING | Tutorial | ||
| 165 | Fish Fight | dp math probabilities | Statement | F | Codeforces Round 1081 (Div. 2) {2192} | PROGRAMMING | 3000.0 | Codeforces Round 1081 (Div. 2) Editorial | |
| 970 | Operation Permutation | combinatorics dp math probabilities | Statement | G | Codeforces Round 1084 (Div. 3) {2200} | PROGRAMMING | Codeforces Round 1084 (Div. 3) Editorial | ||
| 589 | Interval Game | bitmasks combinatorics dp games greedy math probabilities | Statement | F | Codeforces Round 1091 (Div. 2) and CodeCraft 26 {2217} | PROGRAMMING | 2750.0 |