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Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 71260 | Die Roll | math probabilities | Statement | A | Codeforces Beta Round 9 (Div. 2 Only) {9} | PROGRAMMING | Codeforces Beta Round #9 tutorial | 1000 | |
| 963 | Tickets | combinatorics math probabilities | Statement | D | Codeforces Beta Round 26 (Codeforces format) {26} | PROGRAMMING | Разбор Codeforces Beta Round #26 (ещё один) | 2800 | |
| 1704 | First Digit Law | dp math probabilities | Statement | C | Codeforces Beta Round 50 {54} | PROGRAMMING | Codeforces Beta Round #50: Editorial for problem E | 2000 | |
| 537 | Half-decay tree | data structures divide and conquer dp math probabilities | Statement | D | Codeforces Beta Round 62 {68} | PROGRAMMING | 2400 | ||
| 2889 | Falling Anvils | math probabilities | Statement | B | Codeforces Beta Round 69 (Div. 1 Only) {77} | PROGRAMMING | Codeforces Beta Round #69 tutorial | 1800 | |
| 569 | Help Shrek and Donkey | dp games math probabilities | Statement | E | Codeforces Beta Round 78 (Div. 1 Only) {98} | PROGRAMMING | Editorial | 2500 | |
| 4349 | Basketball Team | combinatorics dp math probabilities | Statement | B | Codeforces Beta Round 83 (Div. 1 Only) {107} | PROGRAMMING | Tutorial | 1700 | |
| 923 | Museum | math matrices probabilities | Statement | D | Codeforces Beta Round 86 (Div. 1 Only) {113} | PROGRAMMING | Codeforces Beta Round #86 Editorial | 2500 | |
| 9286 | Bag of mice | dp games math probabilities | Statement | D | Codeforces Round 105 (Div. 2) {148} | PROGRAMMING | Codeforces Round #105 (Div. 2): editorial | 1900 | |
| 772 | Smart Cheater | data structures math probabilities | Statement | C | Codeforces Round 107 (Div. 1) {150} | PROGRAMMING | Tutorial | 2300 | |
| 2521 | Wizards and Huge Prize | dp math probabilities | Statement | B | Codeforces Round 114 (Div. 1) {167} | PROGRAMMING | Codeforces Round #114 — Tutorial | 2000 | |
| 332 | Plane of Tanks: Duel | brute force dp math probabilities | Statement | D | Codeforces Round 115 {175} | PROGRAMMING | Codeforces Round #115 — editorial A-E | 2400 | |
| 1270 | Little Elephant and Furik and Rubik | math probabilities | Statement | C | Codeforces Round 129 (Div. 1) {204} | PROGRAMMING | Tutorial | 2200 | |
| 600 | Gifts | combinatorics dp math probabilities | Statement | E | Codeforces Round 142 (Div. 1) {229} | PROGRAMMING | Codeforces Round #142 Problem Analysis | 2500 | |
| 4434 | Let's Play Osu! | dp math probabilities | Statement | B | Codeforces Round 146 (Div. 1) {235} | PROGRAMMING | Codeforces Round #146 Tutorial | 2100 | |
| 666 | Piglet's Birthday | dp math probabilities | Statement | E | Codeforces Round 152 (Div. 2) {248} | PROGRAMMING | Разбор задач Codeforces Round #152 | 2700 | |
| 1533 | Little Elephant and Broken Sorting | dp math probabilities | Statement | D | Codeforces Round 157 (Div. 1) {258} | PROGRAMMING | Codeforces Round #157 — Editorial | 2600 | |
| 1630 | Maxim and Restaurant | dp math probabilities | Statement | B | Codeforces Round 160 (Div. 1) {261} | PROGRAMMING | Codeforces Round #160 tutorial | 2100 | |
| 1170 | Playlist | math probabilities sortings | Statement | E | Codeforces Round 164 (Div. 2) {268} | PROGRAMMING | Codeforces Round #164 (Div. 2) — Problems Analysis | 2100 | |
| 5356 | Game on Tree | implementation math probabilities trees | Statement | C | Codeforces Round 172 (Div. 1) {280} | PROGRAMMING | T | 2400 | |
| 284 | Ksusha and Square | geometry math probabilities two pointers | Statement | D | Croc Champ 2013 - Round 2 {293} | PROGRAMMING | Croc Champ 2013 — Round 2 — Editorial | 2700 | |
| 440 | Random Ranking | dp math probabilities | Statement | E | Codeforces Round 183 (Div. 1) {303} | PROGRAMMING | Codeforces Round #183 Editorial | 2800 | |
| 13660 | Archer | math probabilities | Statement | B | Codeforces Round 185 (Div. 2) {312} | PROGRAMMING | Codeforces Round #185 Editorial | 1300 | |
| 249 | 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 | |
| 2608 | Ghd | brute force math probabilities | Statement | D | Codeforces Round 213 (Div. 1) {364} | PROGRAMMING | Codeforces Round #213 Editorial | 2600 | |
| 960 | Square Table | constructive algorithms math probabilities | Statement | E | RCC 2014 Warmup (Div. 2) {417} | PROGRAMMING | RCC 2014 WarmUp Analysis | 2400 | |
| 832 | Valera and Number | bitmasks dp math probabilities | Statement | E | Codeforces Round 252 (Div. 2) {441} | PROGRAMMING | Разбор Codeforces Round #252 (Div. 2) | 2700 | |
| 6181 | Andrey and Problem | greedy math probabilities | Statement | B | Codeforces Round 253 (Div. 1) {442} | PROGRAMMING | Codeforces #253 editorial | 1800 | |
| 490 | DZY Loves Games | math matrices probabilities | Statement | D | Codeforces Round #FF (Div. 1) {446} | PROGRAMMING | Codeforces Round #FF(255) Editorial | 2800 | |
| 1779 | Magic Trick | combinatorics math probabilities | Statement | C | MemSQL Start[c]UP 2.0 - Round 1 {452} | PROGRAMMING | MemSQL Start[c]UP 2.0 Round 1 and 2 Editorials | 2100 | |
| 418 | Bingo! | combinatorics math probabilities | Statement | D | MemSQL Start[c]UP 2.0 - Round 2 {457} | PROGRAMMING | MemSQL Start[c]UP 2.0 Round 1 and 2 Editorials | 2700 | |
| 37831 | Dreamoon and WiFi | bitmasks brute force combinatorics dp math probabilities | Statement | B | Codeforces Round 272 (Div. 2) {476} | PROGRAMMING | 1300 | ||
| 8387 | Ilya and Escalator | combinatorics dp math probabilities | Statement | D | Codeforces Round 293 (Div. 2) {518} | PROGRAMMING | Codeforces Round #293 (Div.2) Editorial | 1900 | |
| 711 | Kyoya and Train | dp fft graphs math probabilities | Statement | E | Codeforces Round 309 (Div. 1) {553} | PROGRAMMING | Codeforces Round #309 Editorial | 3300 | |
| 765 | Wilbur and Trees | dp math probabilities sortings | Statement | D | Codeforces Round 331 (Div. 2) {596} | PROGRAMMING | Codeforces Round #331 Editorial | 2500 | |
| 1458 | Kleofáš and the n-thlon | dp math probabilities | Statement | C | Codeforces Round 333 (Div. 1) {601} | PROGRAMMING | Codeforces Round #333 — editorial | 2400 | |
| 273 | 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 | |
| 6366 | Wet Shark and Flowers | combinatorics math number theory probabilities | Statement | C | Codeforces Round 341 (Div. 2) {621} | PROGRAMMING | 1700 | ||
| 576 | Birthday | greedy math probabilities | Statement | D | AIM Tech Round (Div. 1) {623} | PROGRAMMING | 2600 | ||
| 1596 | 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 | |
| 738 | Bear and Destroying Subtrees | dp math probabilities trees | Statement | E | VK Cup 2016 - Round 3 {643} | PROGRAMMING | VK Cup 2016 — Round 3 — Editorial | 2600 | |
| 619 | Gambling Nim | bitmasks math matrices probabilities | Statement | A | CROC 2016 - Final Round [Private, For Onsite Finalists Only] {662} | PROGRAMMING | Editorial for CROC 2016 Finals and Codeforces Round #347 | 2400 | |
| 365 | Bear and Chase | brute force dfs and similar graphs implementation math probabilities | Statement | D | Codeforces Round 356 (Div. 1) {679} | PROGRAMMING | Codeforces Round #356 — Editorial | 2900 | |
| 3846 | Puzzles | dfs and similar math probabilities trees | Statement | B | Codeforces Round 362 (Div. 1) {696} | PROGRAMMING | Codeforces Round #362 (Editorial) | 1800 | |
| 1466 | LRU | bitmasks dp math probabilities | Statement | C | Codeforces Round 363 (Div. 1) {698} | PROGRAMMING | Solution | 2700 | |
| 1429 | ZS and The Birthday Paradox | math number theory probabilities | Statement | E | Codeforces Round 369 (Div. 2) {711} | PROGRAMMING | 46830 | 2400 | |
| 739 | Memory and Casinos | data structures math probabilities | Statement | E | Codeforces Round 370 (Div. 2) {712} | PROGRAMMING | Codeforces Round #370 Editorial | 2700 | |
| 487 | Pokermon League challenge | math probabilities | Statement | H | Bubble Cup 9 - Finals [Online Mirror] {717} | PROGRAMMING | Tutorial | 2400 | |
| 2747 | Gosha is hunting | brute force data structures dp flows math probabilities sortings | Statement | E | Codeforces Round 381 (Div. 1) {739} | PROGRAMMING | 48582 | 2900 | |
| 3516 | 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 | |
| 1147 | Barrels and boxes | brute force combinatorics math number theory probabilities | Statement | F | 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) | 2300 | |
| 155 | Marmots (hard) | math probabilities | Statement | D3 | Helvetic Coding Contest 2017 online mirror (teams allowed, unrated) {802} | PROGRAMMING | helvetic-coding-contest-2017-editorial.pdf | 2800 | |
| 151 | Marmots (hard) | math probabilities | Statement | F | Helvetic Coding Contest 2017 online mirror (teams allowed, unrated) {802} | PROGRAMMING | helvetic-coding-contest-2017-editorial.pdf | 2800 | |
| 2705 | Random Query | data structures math probabilities two pointers | Statement | F | Educational Codeforces Round 28 {846} | PROGRAMMING | 54357 | 2000 | |
| 2667 | New Year and Arbitrary Arrangement | dp math probabilities | Statement | D | Good Bye 2017 {908} | PROGRAMMING | Good Bye 2017 Editorial | 2200 | |
| 801 | Strongly Connected Tournament | dp graphs math probabilities | Statement | F | Hello 2018 {913} | PROGRAMMING | Tutorial | 2700 | |
| 194 | Don't Exceed | math probabilities | Statement | H | Hello 2018 {913} | PROGRAMMING | Tutorial | 3400 | |
| 2849 | Fafa and Ancient Alphabet | math probabilities | Statement | D | Codeforces Round 465 (Div. 2) {935} | PROGRAMMING | 1900 | ||
| 3442 | Intercity Travelling | combinatorics math probabilities | Statement | E | Educational Codeforces Round 47 (Rated for Div. 2) {1009} | PROGRAMMING | 60630 | 1900 | |
| 2123 | Vasya and Magic Matrix | dp math probabilities | Statement | E | Codeforces Round 510 (Div. 2) {1042} | PROGRAMMING | Tutorial | 2300 | |
| 888 | Interstellar battle | math probabilities trees | Statement | D | Bubble Cup 11 - Finals [Online Mirror, Div. 1] {1045} | PROGRAMMING | Tutorial (PDF) | 2600 | |
| 610 | Computer Game | dp greedy math probabilities | Statement | D | Codeforces Round 518 (Div. 1) [Thanks, Mail.Ru!] {1067} | PROGRAMMING | Tutorial | 2800 | |
| 477 | Mergesort Strikes Back | math probabilities | Statement | G | Avito Cool Challenge 2018 {1081} | PROGRAMMING | 63888 | 3000 | |
| 2113 | Inversion Expectation | dp math probabilities | Statement | F | Educational Codeforces Round 57 (Rated for Div. 2) {1096} | PROGRAMMING | Разбор Educational Codeforces Round 57 | 2300 | |
| 1344 | 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 | |
| 3234 | Makoto and a Blackboard | dp math number theory probabilities | Statement | D | Hello 2019 {1097} | PROGRAMMING | 64310 | 2200 | |
| 2776 | Steps to One | dp math number theory probabilities | Statement | D | Codeforces Round 548 (Div. 2) {1139} | PROGRAMMING | Codeforces Round #548 Editorial | 2300 | |
| 568 | Gold Experience | constructive algorithms graphs math number theory probabilities | Statement | G | Codeforces Global Round 3 {1148} | PROGRAMMING | Codeforces Global Round 3 Editorial | 3100 | |
| 965 | Serval and Bonus Problem | combinatorics dp math probabilities | Statement | F | Codeforces Round 551 (Div. 2) {1153} | PROGRAMMING | Editorial | 2800 | |
| 1753 | Card Bag | dp math probabilities | Statement | F | Educational Codeforces Round 64 (Rated for Div. 2) {1156} | PROGRAMMING | 66827 | 2500 | |
| 143 | Parallel Universes (Hard) | math matrices | Statement | D2 | Helvetic Coding Contest 2019 online mirror (teams allowed, unrated) {1184} | PROGRAMMING | helvetic-coding-contest-2019-editorial.pdf | 3300 | |
| 1167 | Expected Square Beauty | dp math probabilities | Statement | F | Educational Codeforces Round 67 (Rated for Div. 2) {1187} | PROGRAMMING | Разбор Educational Codeforces Round 67 | 2600 | |
| 271 | Alice and the Cactus | dfs and similar graphs math probabilities | Statement | F | Codeforces Round 593 (Div. 2) {1236} | PROGRAMMING | 70654 | 2900 | |
| 1633 | Tree Queries | data structures probabilities trees | Statement | D | Codeforces Round 601 (Div. 1) {1254} | PROGRAMMING | Codeforces Round #601 Editorial | 2600 | |
| 4632 | Beautiful Mirrors | data structures dp math probabilities | Statement | E | Codeforces Round 604 (Div. 2) {1265} | PROGRAMMING | Codeforces Round #604 Editorial | 2100 | |
| 844 | Game Relics | math probabilities | Statement | G | 2019-2020 ICPC, NERC, Northern Eurasia Finals (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1267} | PROGRAMMING | nerc-2019-tutorial.pdf | 3100 | |
| 2681 | 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 | |
| 7448 | Santa's Bot | combinatorics math probabilities | Statement | D | Educational Codeforces Round 79 (Rated for Div. 2) {1279} | PROGRAMMING | Educational Codeforces Round 79 Editorial | 1700 | |
| 817 | LCC | data structures math matrices probabilities | Statement | D | Codeforces Round 612 (Div. 1) {1286} | PROGRAMMING | Codeforces Round #612 - Editorial | 2900 | |
| 3307 | Kuroni and the Punishment | math number theory probabilities | Statement | F | Ozon Tech Challenge 2020 (Div.1 + Div.2, Rated, T-shirts + prizes!) {1305} | PROGRAMMING | 2500.0 | Ozon Tech Challenge 2020 Editorial | 2500 |
| 1125 | Slime and Biscuits | math probabilities | Statement | D | Codeforces Round 641 (Div. 1) {1349} | PROGRAMMING | 2000.0 | Codeforces Round #641 Editorial | 3200 |
| 994 | Circular Dungeon | greedy math probabilities | Statement | G | Educational Codeforces Round 91 (Rated for Div. 2) {1380} | PROGRAMMING | Educational Codeforces Round 91 Editorial | ||
| 1069 | ZS Shuffles Cards | combinatorics math probabilities | Statement | H | Codeforces Global Round 10 {1392} | PROGRAMMING | 3500.0 | Codeforces Global Round 10 — Editorial | |
| 2287 | Expected Damage | binary search combinatorics math probabilities | Statement | E | Educational Codeforces Round 95 (Rated for Div. 2) {1418} | PROGRAMMING | Unofficial Editorial for Educational Round 95 (Div. 2) | ||
| 8877 | Bargain | dp math probabilities | Statement | C | Codeforces Round 675 (Div. 2) {1422} | PROGRAMMING | 1000.0 | Codeforces Round #675 (Div. 2) Editorial | |
| 4468 | Checkpoints | brute force constructive algorithms greedy math probabilities | Statement | D | Codeforces Round 688 (Div. 2) {1453} | PROGRAMMING | 2000.0 | Codeforces Round #688 (Div. 2) Editorial | |
| 17986 | Red-Blue Shuffle | math probabilities | Statement | A | Codeforces Round 691 (Div. 2) {1459} | PROGRAMMING | 750.0 | Codeforces Round #691 Editorial (finished) | |
| 12552 | Random Events | math probabilities | Statement | C | Codeforces Round 689 (Div. 2, based on Zed Code Competition) {1461} | PROGRAMMING | 1250.0 | Codeforces Round #689 (Div. 2). Editorial | |
| 336 | Nezzar and Chocolate Bars | combinatorics fft math probabilities | Statement | F | Codeforces Round 698 (Div. 1) {1477} | PROGRAMMING | 4000.0 | 87294 | 3500 |
| 432 | School Clubs | dp fft math number theory probabilities | Statement | E | Codeforces Round 700 (Div. 1) {1479} | PROGRAMMING | 4000.0 | Editorial of Codeforces Round #700 | |
| 598 | Is It Rated? | greedy interactive math probabilities | Statement | I | 2020-2021 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1510} | PROGRAMMING | nerc-2020-offline-tutorial.pdf | ||
| 2519 | Assimilation IV | combinatorics dp math probabilities | Statement | E | Educational Codeforces Round 109 (Rated for Div. 2) {1525} | PROGRAMMING | 90793 | ||
| 10192 | Secret Santa | constructive algorithms flows graphs math probabilities | Statement | D | Codeforces Round 733 (Div. 1 + Div. 2, based on VK Cup 2021 - Elimination (Engine)) {1530} | PROGRAMMING | 1500.0 | Codeforces Round #733 Editorial (all problems) | |
| 3063 | Tree Array | brute force combinatorics dp math probabilities trees | Statement | B | Codeforces Round 728 (Div. 1) {1540} | PROGRAMMING | 1250.0 | Tutorial | |
| 5654 | Need for Pink Slips | brute force dfs and similar implementation math probabilities | Statement | C | Codeforces Round 730 (Div. 2) {1543} | PROGRAMMING | 1500.0 | Codeforces Round #730 (Div. 2) Editorial | |
| 1457 | 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 |
| 467 | Tubular Bells | interactive math number theory probabilities | Statement | F | Codeforces Round 741 (Div. 2) {1562} | PROGRAMMING | 3500.0 | Editorial of Codeforces Round 741 (Div. 2) | |
| 88 | Game of Chance | math probabilities | Statement | G | ICPC WF Moscow Invitational Contest - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1578} | PROGRAMMING | Tutorial (PDF) | ||
| 2039 | Bubble Strike | combinatorics math probabilities ternary search | Statement | C | Bubble Cup 14 - Finals Online Mirror (Unrated, ICPC Rules, Teams Preferred, Div. 1) {1599} | PROGRAMMING | BubbleCup2021.pdf | ||
| 2884 | Messages | greedy math probabilities sortings | Statement | E | Educational Codeforces Round 117 (Rated for Div. 2) {1612} | PROGRAMMING | 97164 | ||
| 1490 | Robot Cleaner Revisit | dp implementation math probabilities | Statement | D | Codeforces Round 763 (Div. 2) {1623} | PROGRAMMING | 2500.0 | Codeforces Round #763 (Div. 2) Editorial | |
| 711 | Mark and the Online Exam | bitmasks constructive algorithms interactive math probabilities | Statement | F | Codeforces Round 807 (Div. 2) {1705} | PROGRAMMING | 3000.0 | Codeforces Round #807 (Div 2.) Editorial | |
| 5415 | Wish I Knew How to Sort | dp math probabilities | Statement | C | Codeforces Round 829 (Div. 1) {1753} | PROGRAMMING | 1750.0 | Tutorial | 2000 |
| 1634 | Koxia and Tree | combinatorics dp math probabilities trees | Statement | E | Good Bye 2022: 2023 is NEAR {1770} | PROGRAMMING | 2000.0 | Good Bye 2022 -- Editorial | |
| 560 | 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 | ||
| 3521 | Flexible String Revisit | combinatorics dp math probabilities | Statement | D | Codeforces Round 848 (Div. 2) {1778} | PROGRAMMING | 1750.0 | Codeforces Round #848 (Div. 2) Editorial | |
| 383 | Roads in E City | interactive math probabilities trees | Statement | E | Codeforces Round 866 (Div. 1) {1819} | PROGRAMMING | 2750.0 | Codeforces Round #866 (Div.1, Div.2, based on Lipetsk Team Olympiad) Editorial | |
| 1347 | Random Walk | dp graphs math probabilities trees | Statement | F | Codeforces Round 868 (Div. 2) {1823} | PROGRAMMING | 2500.0 | 115465 | |
| 6241 | 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 |
| 3532 | 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 |
| 478 | Fading into Fog | geometry interactive math probabilities | Statement | F | Codeforces Round 870 (Div. 2) {1826} | PROGRAMMING | 3000.0 | Codeforces Round #870 (Div. 2) Editorial | 2800 |
| 1195 | Twin Clusters | bitmasks math meet-in-the-middle probabilities | Statement | C | Codeforces Round 880 (Div. 1) {1835} | PROGRAMMING | 1500.0 | Codeforces Round 880 Editorial | |
| 324 | Old Mobile | dp math probabilities | Statement | E | Codeforces Round 880 (Div. 1) {1835} | PROGRAMMING | 2250.0 | Codeforces Round 880 Editorial | |
| 2843 | In Search of Truth (Easy Version) | brute force constructive algorithms interactive math probabilities | Statement | G1 | Codeforces Round 878 (Div. 3) {1840} | PROGRAMMING | Codeforces Round #878 (Div.3) Editorial | ||
| 1213 | In Search of Truth (Hard Version) | constructive algorithms interactive math probabilities | Statement | G2 | Codeforces Round 878 (Div. 3) {1840} | PROGRAMMING | Codeforces Round #878 (Div.3) Editorial | ||
| 1674 | 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 | |
| 1937 | 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) | |
| 3111 | 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 | |
| 561 | 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 | |
| 999 | 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 | ||
| 2228 | 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 | |
| 974 | 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 | |
| 143 | Fugitive Frenzy | math probabilities | Statement | F | 2023-2024 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1912} | PROGRAMMING | Tutorials (PDF) | 3100 | |
| 4900 | 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 | |
| 1709 | Rare Coins | combinatorics math probabilities | Statement | F | Educational Codeforces Round 163 (Rated for Div. 2) {1948} | PROGRAMMING | Educational Codeforces Round 163 Editorial | ||
| 483 | Clacking Balls | combinatorics math probabilities | Statement | G | Codeforces Global Round 25 {1951} | PROGRAMMING | 3250.0 | Codeforces Global Round 25 Editorial | |
| 2525 | I Love Balls | combinatorics math probabilities | Statement | E | Codeforces Round 956 (Div. 2) and ByteRace 2024 {1983} | PROGRAMMING | 2000.0 | ||
| 4078 | 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 | |
| 1975 | 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 | |
| 2747 | 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 | |
| 21237 | Perfecto | brute force constructive algorithms greedy math probabilities | Statement | B | Codeforces Round 1007 (Div. 2) {2071} | PROGRAMMING | 1000.0 | Codeforces Round 1007 (Div. 2) Editorial | |
| 4193 | 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 | |
| 1482 | 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 | |
| 268 | 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 | |
| 1234 | 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 | |
| 124 | Inter Active (Hard Version) | binary search bitmasks constructive algorithms graphs implementation interactive math probabilities | Statement | G2 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} | PROGRAMMING | 2750.0 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial | |
| 659 | Hidden Single (Version 2) | divide and conquer interactive math probabilities | Statement | E2 | Codeforces Round 1053 (Div. 1) {2150} | PROGRAMMING | 1750.0 | Editorial of Codeforces Round 1053 (Div. 1, Div. 2) | |
| 1887 | Hidden Single (Version 1) | divide and conquer interactive math probabilities sortings | Statement | E1 | Codeforces Round 1053 (Div. 1) {2150} | PROGRAMMING | 2000.0 | Editorial of Codeforces Round 1053 (Div. 1, Div. 2) | |
| 556 | Isaac's Queries | brute force constructive algorithms dfs and similar divide and conquer greedy interactive math probabilities | Statement | G | Codeforces Round 1066 (Div. 1 + Div. 2) {2157} | PROGRAMMING | 3000.0 | Codeforces Round 1066 (Div. 1 + Div. 2) Editorial | |
| 2366 | Removal of a Sequence (Hard Version) | binary search constructive algorithms divide and conquer greedy implementation math number theory probabilities | Statement | D2 | Educational Codeforces Round 184 (Rated for Div. 2) {2169} | PROGRAMMING | Educational Codeforces Round 184 Editorial | ||
| 1240 | Beautiful Patterns (Easy Version) | math probabilities | Statement | C1 | Codeforces Round 1069 (Div. 1) {2174} | PROGRAMMING | 1500.0 | Codeforces Round 1069 Editorial | |
| 1090 | Beautiful Patterns (Hard Version) | math probabilities | Statement | C2 | Codeforces Round 1069 (Div. 1) {2174} | PROGRAMMING | 500.0 | Codeforces Round 1069 Editorial | |
| 741 | 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 | ||
| 193 | Fish Fight | dp math probabilities | Statement | F | Codeforces Round 1081 (Div. 2) {2192} | PROGRAMMING | 3000.0 | Codeforces Round 1081 (Div. 2) Editorial | |
| 1154 | Operation Permutation | combinatorics dp math probabilities | Statement | G | Codeforces Round 1084 (Div. 3) {2200} | PROGRAMMING | Codeforces Round 1084 (Div. 3) Editorial | ||
| 872 | Interval Game | bitmasks combinatorics dp games greedy math probabilities | Statement | F | Codeforces Round 1091 (Div. 2) and CodeCraft 26 {2217} | PROGRAMMING | 2750.0 | Tutorial |