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1 2 >Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 997 | Quest | dp greedy | Statement | F | VK Cup 2015 - Round 3 (unofficial online mirror, Div. 1 only) {542} | PROGRAMMING | 17697 | 2100 | |
| 0 | Scheduler for Invokers | *special | Statement | A | VK Cup 2016 - Wild Card Round 2 {642} | PROGRAMMING | 2900 | ||
| 15626 | Bear and Prime 100 | constructive algorithms interactive math | Statement | A | Codeforces Round 356 (Div. 1) {679} | PROGRAMMING | Codeforces Round #356 — Editorial | 1400 | |
| 1509 | Searching Rectangles | binary search constructive algorithms interactive | Statement | B | Codeforces Round 371 (Div. 1) {713} | PROGRAMMING | Codeforces Round #371 Editorial | 2200 | |
| 9028 | Guess the Array | constructive algorithms interactive math | Statement | C | Technocup 2017 - Elimination Round 1 (Unofficially Open for Everyone, Rated for Div. 2) {727} | PROGRAMMING | Tutorial | 1400 | |
| 2791 | Minimum and Maximum | constructive algorithms interactive | Statement | B | 2016-2017 ACM-ICPC, NEERC, Southern Subregional Contest (Online Mirror, ACM-ICPC Rules, Teams Preferred) {730} | PROGRAMMING | Разбор задач (видео, по-русски) | 1900 | |
| 1965 | Hongcow's Game | bitmasks divide and conquer interactive | Statement | B | Codeforces Round 385 (Div. 1) {744} | PROGRAMMING | Codeforces Round #385 Editorial | 2000 | |
| 597 | New Year and Finding Roots | constructive algorithms implementation interactive trees | Statement | F | Good Bye 2016 {750} | PROGRAMMING | Good Bye 2016 — hints and codes | 2700 | |
| 241 | New Year and Snowy Grid | dfs and similar dsu graphs interactive | Statement | H | Good Bye 2016 {750} | PROGRAMMING | Good Bye 2016 — hints and codes | 3400 | |
| 1445 | Interactive Bulls and Cows (Easy) | brute force constructive algorithms implementation | Statement | B | Testing Round 13 {753} | PROGRAMMING | 1600 | ||
| 406 | Interactive Bulls and Cows (Hard) | brute force constructive algorithms interactive | Statement | C | Testing Round 13 {753} | PROGRAMMING | 2400 | ||
| 15174 | PolandBall and Forest | dfs and similar dsu graphs interactive trees | Statement | C | 8VC Venture Cup 2017 - Elimination Round {755} | PROGRAMMING | 8VC Venture Cup 2017 — Elimination Round [Editorial] | 1300 | |
| 220 | Verifying Kingdom | binary search divide and conquer interactive trees | Statement | E | VK Cup 2017 - Round 2 {772} | PROGRAMMING | VK Cup Round 2 + Codeforces Round #409 Tutorial | 3200 | |
| 411 | Finding lines | constructive algorithms divide and conquer interactive | Statement | D | Codeforces Round 407 (Div. 1) {788} | PROGRAMMING | Codeforces Round #407(Div.1 + Div.2) Editorial | 2900 | |
| 1788 | Glad to see you! | binary search interactive | Statement | B | Codeforces Round 415 (Div. 1) {809} | PROGRAMMING | 52099 | 2200 | |
| 1913 | Vladik and Favorite Game | constructive algorithms dfs and similar graphs interactive | Statement | D | Codeforces Round 416 (Div. 2) {811} | PROGRAMMING | 2000 | ||
| 1359 | The penguin's game | binary search constructive algorithms interactive | Statement | E | Codeforces Round 427 (Div. 2) {835} | PROGRAMMING | 2400 | ||
| 2599 | Interactive LowerBound | brute force interactive probabilities | Statement | B | AIM Tech Round 4 (Div. 1) {843} | PROGRAMMING | AIM Tech Round 4 -- Editorial | 2000 | |
| 2064 | Mahmoud and Ehab and the binary string | binary search divide and conquer interactive | Statement | D | Codeforces Round 435 (Div. 2) {862} | PROGRAMMING | Codeforces round #435 editorial | 2000 | |
| 1301 | Something with XOR Queries | brute force interactive probabilities | Statement | D | Technocup 2018 - Elimination Round 2 {870} | PROGRAMMING | Editorial Codeforces Round 440 Div.1+Div.2 (and Technocup 2018 — Elimination Round 2) | 2100 | |
| 2305 | Ithea Plays With Chtholly | binary search constructive algorithms games greedy interactive | Statement | B | Codeforces Round 449 (Div. 1) {896} | PROGRAMMING | Codeforces Round #449 Editorial | 2000 | |
| 568 | Jamie and To-do List | data structures interactive trees | Statement | D | Codeforces Round 457 (Div. 2) {916} | PROGRAMMING | Codeforces Round #457 (Div. 2) Editorial | 2600 | |
| 1 | BuberPool Taxi Optimization | Statement | A | VK Cup 2018 - Wild-card Round 2 {927} | PROGRAMMING | 2800 | |||
| 2128 | A Map of the Cat | brute force | Statement | B | April Fools Contest 2018 {952} | PROGRAMMING | April Fools Day Contest 2018: editorial | 1800 | |
| 533 | Guess two numbers | binary search interactive | Statement | C | Codeforces Round 497 (Div. 1) {1007} | PROGRAMMING | Editorial for Codeforces Round #497 by Skyglow | 2800 | |
| 6430 | Rocket | binary search interactive | Statement | B | Codeforces Round 499 (Div. 1) {1010} | PROGRAMMING | 60851 | 1800 | |
| 2128 | The hat | binary search interactive | Statement | B | Codeforces Round 503 (by SIS, Div. 1) {1019} | PROGRAMMING | 61161 | 2200 | |
| 2237 | Down or Right | constructive algorithms interactive matrices | Statement | E | Codeforces Round 504 (rated, Div. 1 + Div. 2, based on VK Cup 2018 Final) {1023} | PROGRAMMING | Codeforces Round 504 Editorial | 2100 | |
| 654 | Guess the number | dp interactive | Statement | G | AIM Tech Round 5 (rated, Div. 1 + Div. 2) {1028} | PROGRAMMING | 61493 | 2900 | |
| 2631 | Divisors | interactive math number theory | Statement | D | Lyft Level 5 Challenge 2018 - Elimination Round {1033} | PROGRAMMING | The Lyft Level 5 Challenge 2018 Elimination Round (Div. 1 + Div. 2) Editorial | 2000 | |
| 799 | Hidden Bipartite Graph | binary search constructive algorithms dfs and similar graphs interactive | Statement | E | Lyft Level 5 Challenge 2018 - Elimination Round {1033} | PROGRAMMING | The Lyft Level 5 Challenge 2018 Elimination Round (Div. 1 + Div. 2) Editorial | 2700 | |
| 2603 | Subway Pursuit | binary search interactive probabilities | Statement | B | Codeforces Round 507 (Div. 1, based on Olympiad of Metropolises) {1039} | PROGRAMMING | 61668 | 2100 | |
| 1718 | Intersecting Subtrees | dfs and similar interactive trees | Statement | B | Lyft Level 5 Challenge 2018 - Final Round {1044} | PROGRAMMING | Lyft Level 5 Challenge 2018 — Final Round — Editorial | 1900 | |
| 2584 | Pick Heroes | greedy implementation interactive sortings | Statement | C | Mail.Ru Cup 2018 Round 3 {1056} | PROGRAMMING | Mail.Ru Cup 2018 Round 3 Editorial | 1700 | |
| 917 | Lost Root | interactive probabilities | Statement | F | Codeforces Round 523 (Div. 2) {1061} | PROGRAMMING | Tutorial (en) | 2400 | |
| 3289 | Dwarves, Hats and Extrasensory Abilities | binary search constructive algorithms geometry interactive | Statement | C | Codeforces Round 516 (Div. 1, by Moscow Team Olympiad) {1063} | PROGRAMMING | 1900 | ||
| 934 | Katya and Segments Sets | data structures interactive sortings | Statement | F | Codeforces Round 524 (Div. 2) {1080} | PROGRAMMING | Codeforces Round #524 (Div. 2) Editorial | 2700 | |
| 510 | Tricky Interactor | constructive algorithms implementation interactive | Statement | F | Avito Cool Challenge 2018 {1081} | PROGRAMMING | 63888 | 2500 | |
| 3193 | Ehab and another another xor problem | bitmasks constructive algorithms implementation interactive | Statement | D | Codeforces Round 525 (Div. 2) {1088} | PROGRAMMING | Codeforces round #525 editorial | 2000 | |
| 464 | Cactus Search | interactive | Statement | C | 2018-2019 ICPC, NEERC, Northern Eurasia Finals (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1089} | PROGRAMMING | 2800 | ||
| 230 | New Year and the Factorisation Collaboration | interactive math number theory | Statement | G | Good Bye 2018 {1091} | PROGRAMMING | Editorial | 3100 | |
| 917 | Dasha and Chess | constructive algorithms games interactive | Statement | D | Codeforces Round 532 (Div. 2) {1100} | PROGRAMMING | Unofficial Tutorial | 2400 | |
| 3545 | Game with modulo | binary search constructive algorithms interactive | Statement | B | Codeforces Round 534 (Div. 1) {1103} | PROGRAMMING | Codeforces Round #534 — Editorial | 2000 | |
| 3205 | Arithmetic Progression | binary search interactive number theory probabilities | Statement | E | Codeforces Round 538 (Div. 2) {1114} | PROGRAMMING | Codeforces Round #538 (Div. 2) Editorial | 2100 | |
| 1649 | Decypher the String | bitmasks chinese remainder theorem constructive algorithms interactive math | Statement | E | Educational Codeforces Round 60 (Rated for Div. 2) {1117} | PROGRAMMING | 65365 | 2200 | |
| 572 | Legendary Tree | binary search interactive trees | Statement | E | Codeforces Round 542 [Alex Lopashev Thanks-Round] (Div. 1) {1129} | PROGRAMMING | 65520 | 3000 | |
| 2187 | Cooperative Game | constructive algorithms interactive number theory | Statement | D | Codeforces Round 545 (Div. 1) {1137} | PROGRAMMING | Codeforces Round #545 – Editorial | 2500 | |
| 639 | Pink Floyd | graphs interactive | Statement | E | Codeforces Round 549 (Div. 1) {1142} | PROGRAMMING | Codeforces Round #549 Editorial | 3100 | |
| 194 | AI Takeover | Statement | G | April Fools Day Contest 2019 {1145} | PROGRAMMING | 66327 | |||
| 4235 | Tree Diameter | bitmasks graphs interactive | Statement | C | Forethought Future Cup - Elimination Round {1146} | PROGRAMMING | 66639 | 1700 | |
| 481 | Rainbow Coins | interactive | Statement | E | Forethought Future Cup - Final Round (Onsite Finalists Only) {1147} | PROGRAMMING | Forethought Future Cup Final Round Tutorial | 2900 | |
| 353 | Zigzag Game | games interactive | Statement | F | Forethought Future Cup - Final Round (Onsite Finalists Only) {1147} | PROGRAMMING | Forethought Future Cup Final Round Tutorial | 3400 | |
| 1760 | Serval and Snake | binary search brute force interactive | Statement | E | Codeforces Round 551 (Div. 2) {1153} | PROGRAMMING | Editorial | 2100 | |
| 1612 | Guess the Root | brute force interactive math | Statement | E | Educational Codeforces Round 63 (Rated for Div. 2) {1155} | PROGRAMMING | 66687 | 2200 | |
| 230 | Strange device | binary search interactive math trees | Statement | E | Codeforces Round 559 (Div. 1) {1158} | PROGRAMMING | 66993 | 3300 | |
| 16842 | Lost Numbers | brute force divide and conquer interactive math | Statement | B | Educational Codeforces Round 65 (Rated for Div. 2) {1167} | PROGRAMMING | 67058 | 1400 | |
| 1993 | Ehab and the Big Finale | constructive algorithms divide and conquer graphs implementation interactive trees | Statement | F | Codeforces Round 563 (Div. 2) {1174} | PROGRAMMING | Codeforces round #563 editorial | 2300 | |
| 204 | Alesya and Discrete Math | divide and conquer interactive | Statement | E | Codeforces Round 569 (Div. 1) {1179} | PROGRAMMING | Editorial of Round #569 | 3200 | |
| 149 | Knightmare (easy) | graphs interactive shortest paths | Statement | E1 | Codeforces Round 577 (Div. 2) {1201} | PROGRAMMING | Codeforces Round #577 (Div 2) Editorial | 2900 | |
| 167 | Knightmare (hard) | graphs interactive shortest paths | Statement | E2 | Codeforces Round 577 (Div. 2) {1201} | PROGRAMMING | Codeforces Round #577 (Div 2) Editorial | 3000 | |
| 1271 | Palindromic Paths | implementation interactive | Statement | C | Codeforces Round 580 (Div. 1) {1205} | PROGRAMMING | 69158 | 2500 | |
| 6679 | XOR Guessing | bitmasks interactive math | Statement | E | Educational Codeforces Round 71 (Rated for Div. 2) {1207} | PROGRAMMING | Educational Codeforces Round 71 Editorial | 1800 | |
| 1602 | Point Ordering | constructive algorithms geometry interactive math | Statement | C | Codeforces Round 601 (Div. 1) {1254} | PROGRAMMING | Codeforces Round #601 Editorial | 2300 | |
| 1069 | Intriguing Selection | brute force constructive algorithms implementation interactive sortings | Statement | I | 2019-2020 ICPC, NERC, Northern Eurasia Finals (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1267} | PROGRAMMING | nerc-2019-tutorial.pdf | 2700 | |
| 4933 | Strange Device | constructive algorithms interactive math sortings | Statement | D | Good Bye 2019 {1270} | PROGRAMMING | Разбор Goodbye 2019 | 1900 | |
| 93 | Шардирование постов | *special binary search interactive | Statement | F | VK Cup 2019 - Квалификация (Engine) {1275} | PROGRAMMING | 3000.0 | ||
| 2386 | Enchanted Artifact | constructive algorithms interactive strings | Statement | D | Codeforces Round 610 (Div. 2) {1282} | PROGRAMMING | 72461 | 2300 | |
| 1587 | Madhouse (Easy version) | brute force constructive algorithms interactive math | Statement | C1 | Codeforces Round 612 (Div. 1) {1286} | PROGRAMMING | Codeforces Round #612 - Editorial | 2400 | |
| 756 | Madhouse (Hard version) | brute force constructive algorithms hashing interactive math | Statement | C2 | Codeforces Round 612 (Div. 1) {1286} | PROGRAMMING | Codeforces Round #612 - Editorial | 2900 | |
| 955 | Coffee Varieties (hard version) | constructive algorithms graphs interactive | Statement | D | Codeforces Round 616 (Div. 1) {1290} | PROGRAMMING | 2500.0 | Codeforces Round #616 Editorial | 2900 |
| 733 | Coffee Varieties (easy version) | graphs interactive | Statement | F | Codeforces Round 616 (Div. 2) {1291} | PROGRAMMING | 3000.0 | Codeforces Round #616 Editorial | 2700 |
| 466 | Rin and The Unknown Flower | constructive algorithms greedy interactive math | Statement | E | Codeforces Round 614 (Div. 1) {1292} | PROGRAMMING | 2250.0 | Codeforces Round #614 Editorial | 3500 |
| 212 | So Mean | interactive math | Statement | E | Codeforces Round 618 (Div. 1) {1299} | PROGRAMMING | 2250.0 | Codeforces Round #618 Editorial | 3400 |
| 5379 | Kuroni and the Celebration | constructive algorithms dfs and similar graphs interactive trees | Statement | D | Ozon Tech Challenge 2020 (Div.1 + Div.2, Rated, T-shirts + prizes!) {1305} | PROGRAMMING | 1750.0 | Ozon Tech Challenge 2020 Editorial | 1900 |
| 536 | Yui and Mahjong Set | constructive algorithms interactive | Statement | D | Codeforces Round 635 (Div. 1) {1336} | PROGRAMMING | 2250.0 | Codeforces Round #635 Editorial | 3000 |
| 101 | Nastya and Bees | graphs interactive probabilities | Statement | E | Codeforces Round 637 (Div. 1) - Thanks, Ivan Belonogov! {1340} | PROGRAMMING | 2250.0 | Codeforces Round #637 Editorial | |
| 976 | Find a Gift | binary search interactive probabilities | Statement | G | Educational Codeforces Round 87 (Rated for Div. 2) {1354} | PROGRAMMING | 77593 | 2600 | |
| 969 | Guess Divisors Count | constructive algorithms interactive number theory | Statement | F | Codeforces Round 643 (Div. 2) {1355} | PROGRAMMING | 3000.0 | Codeforces Round #643 (Div. 2) Editorial | 2600 |
| 4440 | Guess The Maximums | binary search divide and conquer implementation interactive math | Statement | D | Codeforces Round 646 (Div. 2) {1363} | PROGRAMMING | 2000.0 | 78202 | 2100 |
| 1582 | X-OR | bitmasks constructive algorithms interactive probabilities | Statement | E | Codeforces Round 649 (Div. 2) {1364} | PROGRAMMING | 2500.0 | Codeforces round #649 editorial | 2700 |
| 1428 | Secure Password | bitmasks combinatorics constructive algorithms interactive math | Statement | G | Codeforces Round 648 (Div. 2) {1365} | PROGRAMMING | 3000.0 | Editorial — Codeforces Round #648 | 2800 |
| 1111 | Lamps on a Circle | games greedy implementation interactive math | Statement | F | Codeforces Global Round 8 {1368} | PROGRAMMING | 3000.0 | Codeforces Global Round 8: editorial | |
| 1809 | The Hidden Pair (Easy Version) | binary search dfs and similar graphs interactive shortest paths trees | Statement | F1 | Codeforces Round 651 (Div. 2) {1370} | PROGRAMMING | 2000.0 | Editorial — Codeforces Round #651 | |
| 1693 | The Hidden Pair (Hard Version) | binary search dfs and similar graphs interactive shortest paths trees | Statement | F2 | Codeforces Round 651 (Div. 2) {1370} | PROGRAMMING | 1250.0 | Editorial — Codeforces Round #651 | |
| 498 | Omkar and Modes | interactive | Statement | F | Codeforces Round 655 (Div. 2) {1372} | PROGRAMMING | 3000.0 | Codeforces Round #655 Editorial | 2800 |
| 2518 | Integer Game | brute force constructive algorithms games interactive math | Statement | F | Codeforces Global Round 9 {1375} | PROGRAMMING | 2000.0 | 79731 | |
| 353 | Colors | *special binary search constructive algorithms interactive | Statement | A | Baltic Olympiad in Informatics 2020, Day 1 (IOI, Unofficial Mirror Contest, Unrated) {1386} | PROGRAMMING | T | ||
| 3767 | Omkar and Duck | bitmasks constructive algorithms interactive math | Statement | E | Codeforces Global Round 10 {1392} | PROGRAMMING | 2000.0 | Codeforces Global Round 10 — Editorial | |
| 358 | The Potion of Great Power | *special binary search data structures graphs interactive sortings two pointers | Statement | A | Central-European Olympiad in Informatics, CEOI 2020, Day 2 (IOI, Unofficial Mirror Contest, Unrated) {1403} | PROGRAMMING | CEOI 2020 Online Mirror — Day 2 Tutorial | ||
| 1283 | Game of Pairs | constructive algorithms dfs and similar interactive math number theory | Statement | D | Codeforces Round 668 (Div. 1) {1404} | PROGRAMMING | 2250.0 | Codeforces Round #668 Editorial | |
| 1894 | Deleting Numbers | binary search brute force interactive number theory | Statement | E | Codeforces Round 670 (Div. 2) {1406} | PROGRAMMING | 2750.0 | Codeforces Round #670 (Div. 2) Editorial | |
| 15024 | Chocolate Bunny | constructive algorithms interactive math two pointers | Statement | C | Codeforces Round 669 (Div. 2) {1407} | PROGRAMMING | 1500.0 | Codeforces Round #669 Editorial | |
| 328 | Milutin's Plums | interactive | Statement | M | Bubble Cup 13 - Finals [Online Mirror, unrated, Div. 1] {1423} | PROGRAMMING | FinalsEditorial2020.pdf | ||
| 7238 | Flamingoes of Mystery | interactive | Statement | F | 2020 ICPC, COMPFEST 12, Indonesia Multi-Provincial Contest (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1425} | PROGRAMMING | Tutorial | 1400 | |
| 128 | Rotary Laser Lock | binary search interactive | Statement | H | Codeforces Raif Round 1 (Div. 1 + Div. 2) {1428} | PROGRAMMING | 4000.0 | Codeforces Raif Round 1 Editorial | |
| 804 | Olha and Igor | interactive trees | Statement | F | Codeforces Round 682 (Div. 2) {1438} | PROGRAMMING | 3000.0 | Codeforces Round #682 (Div. 2) Editorial | |
| 172 | Differentiating Games | games interactive | Statement | F | Codeforces Round 681 (Div. 1, based on VK Cup 2019-2020 - Final) {1442} | PROGRAMMING | 2500.0 | 84298 | |
| 171 | Finding the Vertex | brute force dfs and similar dp interactive trees | Statement | E | Codeforces Round 680 (Div. 1, based on Moscow Team Olympiad) {1444} | PROGRAMMING | 3000.0 | Codeforces Round #680 Editorial | |
| 4948 | Bitwise Queries (Easy Version) | bitmasks constructive algorithms interactive math | Statement | E1 | Codeforces Round 685 (Div. 2) {1451} | PROGRAMMING | 1500.0 | Editorial — Codeforces Round #685 | |
| 3402 | Bitwise Queries (Hard Version) | bitmasks constructive algorithms interactive math | Statement | E2 | Codeforces Round 685 (Div. 2) {1451} | PROGRAMMING | 1000.0 | Editorial — Codeforces Round #685 | |
| 247 | The Riddle of the Sphinx | binary search data structures data structures interactive | Statement | I | Good Bye 2020 {1466} | PROGRAMMING | 4000.0 | Good Bye 2020 Editorial | |
| 1445 | Strange Shuffle | binary search brute force constructive algorithms interactive probabilities | Statement | C | Codeforces Round 694 (Div. 1) {1470} | PROGRAMMING | 1000.0 | 86464 | |
| 13197 | Searching Local Minimum | binary search interactive ternary search | Statement | A | Codeforces Round 700 (Div. 1) {1479} | PROGRAMMING | 500.0 | Editorial of Codeforces Round #700 | |
| 351 | Vabank | binary search interactive | Statement | G | Технокубок 2021 - Финал {1482} | PROGRAMMING | 3500.0 | Technocup 2021: Final Round and Codeforces Round #709 — tutorial | |
| 41 | Vabank | binary search interactive | Statement | E | Codeforces Round 709 (Div. 1, based on Technocup 2021 Final Round) {1483} | PROGRAMMING | 2500.0 | Technocup 2021: Final Round and Codeforces Round #709 — tutorial | |
| 14378 | Guessing the Greatest (easy version) | binary search interactive | Statement | C1 | Codeforces Round 703 (Div. 2) {1486} | PROGRAMMING | 750.0 | Codeforces Round #703 (Div. 2) Editorial | |
| 10074 | Guessing the Greatest (hard version) | binary search interactive | Statement | C2 | Codeforces Round 703 (Div. 2) {1486} | PROGRAMMING | 750.0 | Codeforces Round #703 (Div. 2) Editorial | |
| 1139 | Magnets | binary search constructive algorithms interactive | Statement | F | Codeforces Global Round 13 {1491} | PROGRAMMING | 2000.0 | Codeforces Global Round 13 Editorial | |
| 507 | Enchanted Matrix | bitmasks interactive number theory | Statement | F | Codeforces Round 705 (Div. 2) {1493} | PROGRAMMING | 3250.0 | Codeforces Round #705 (Div.2) Editorial | |
| 2146 | Two Houses | brute force combinatorics graphs interactive probabilities sortings | Statement | E | CodeCraft-21 and Codeforces Round 711 (Div. 2) {1498} | PROGRAMMING | 2500.0 | CodeCraft-21 and Codeforces Round #711 (Div. 2) Editorial | |
| 243 | Graph Coloring | data structures graphs interactive | Statement | G | Educational Codeforces Round 106 (Rated for Div. 2) {1499} | PROGRAMMING | Educational Codeforces Round 106 Editorial | ||
| 7708 | 3-Coloring | constructive algorithms games interactive | Statement | B | Codeforces Round 712 (Div. 1) {1503} | PROGRAMMING | 1000.0 | T | 1700 |
| 16144 | Is it rated - 2 | implementation interactive | Statement | A | April Fools Day Contest 2021 {1505} | PROGRAMMING | tutorial | ||
| 595 | 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 | ||
| 707 | Baby Ehab's Hyper Apartment | binary search graphs interactive sortings | Statement | E | Codeforces Round 716 (Div. 2) {1514} | PROGRAMMING | 2500.0 | Codeforces round #716 editorial | |
| 3375 | Guess the K-th Zero (Hard version) | binary search data structures interactive | Statement | F2 | Codeforces Round 719 (Div. 3) {1520} | PROGRAMMING | Editorial | ||
| 14581 | Guess the K-th Zero (Easy version) | binary search interactive | Statement | F1 | Codeforces Round 719 (Div. 3) {1520} | PROGRAMMING | Editorial | ||
| 4631 | Nastia and a Hidden Permutation | constructive algorithms interactive | Statement | C | Codeforces Round 720 (Div. 2) {1521} | PROGRAMMING | 1750.0 | 90477 | |
| 394 | Median Queries | constructive algorithms interactive probabilities | Statement | F | Codeforces Round 723 (Div. 2) {1526} | PROGRAMMING | 3500.0 | Codeforces Round #723 (Div. 2) Editorial | |
| 2083 | Lost Array | constructive algorithms dp graphs interactive shortest paths | Statement | E | Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) {1534} | PROGRAMMING | 2250.0 | Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) Editorial | |
| 6844 | Lost Tree | constructive algorithms interactive trees | Statement | D | Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) {1534} | PROGRAMMING | 1500.0 | Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) Editorial | |
| 268 | Lost Nodes | dp graphs interactive sortings trees | Statement | H | Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) {1534} | PROGRAMMING | 3500.0 | Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) Editorial | |
| 3083 | Gold Transfer | binary search data structures greedy interactive trees | Statement | E | Educational Codeforces Round 110 (Rated for Div. 2) {1535} | PROGRAMMING | 91481 | ||
| 8033 | RPD and Rap Sheet (Easy Version) | bitmasks constructive algorithms interactive math | Statement | D1 | Codeforces Round 730 (Div. 2) {1543} | PROGRAMMING | 1000.0 | Codeforces Round #730 (Div. 2) Editorial | |
| 2179 | RPD and Rap Sheet (Hard Version) | constructive algorithms dp interactive math | Statement | D2 | Codeforces Round 730 (Div. 2) {1543} | PROGRAMMING | 1250.0 | Codeforces Round #730 (Div. 2) Editorial | |
| 609 | AquaMoon and Wrong Coordinate | constructive algorithms interactive math | Statement | D | Codeforces Round 732 (Div. 1) {1545} | PROGRAMMING | 2250.0 | Codeforces Round #732 Editorial | 3000 |
| 13984 | AquaMoon and Stolen String | interactive | Statement | B | Codeforces Round 732 (Div. 2) {1546} | PROGRAMMING | 1000.0 | Codeforces Round #732 Editorial | 1200 |
| 466 | Guess the Perimeter | binary search interactive number theory | Statement | H | Codeforces Global Round 15 {1552} | PROGRAMMING | 2750.0 | Editorial of Global Round 15 | |
| 8812 | Take a Guess | bitmasks constructive algorithms interactive math | Statement | D | Deltix Round, Summer 2021 (open for everyone, rated, Div. 1 + Div. 2) {1556} | PROGRAMMING | 1500.0 | 94384 | 1800 |
| 767 | Assiut Chess | brute force interactive probabilities two pointers | Statement | E | Codeforces Round 737 (Div. 2) {1557} | PROGRAMMING | 3000.0 | Codeforces Round #737 Editorial | |
| 459 | 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) | |
| 155 | Xor-quiz | constructive algorithms dp interactive math number theory | Statement | H | Codeforces Global Round 16 {1566} | PROGRAMMING | 3750.0 | Codeforces Global Round 16 Editorial | |
| 143 | XOR Guessing | *special interactive | Statement | G | Kotlin Heroes: Practice 8 {1570} | PROGRAMMING | |||
| 523 | The Mind | constructive algorithms interactive probabilities | Statement | M | ICPC WF Moscow Invitational Contest - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1578} | PROGRAMMING | Tutorial (PDF) | ||
| 73 | Interactive Rays | geometry interactive | Statement | I | ICPC WF Moscow Invitational Contest - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1578} | PROGRAMMING | Tutorial (PDF) | ||
| 5954 | Omkar and the Meaning of Life | constructive algorithms interactive | Statement | D | Technocup 2022 - Elimination Round 1 {1583} | PROGRAMMING | 1750.0 | Editorial for Technocup 2022 — Elimination Round 1 and Codeforces Round #749 (Div. 1+Div. 2) | |
| 4008 | Guess the Permutation | binary search combinatorics interactive math | Statement | D | Technocup 2022 - Elimination Round 2 {1584} | PROGRAMMING | 1500.0 | Editorial for Technocup 2022 — Elimination Round 2 and Codeforces Round #755 (Div. 1, Div. 2) | 2000 |
| 2640 | Hemose in ICPC ? | binary search dfs and similar divide and conquer interactive math number theory trees | Statement | D | Codeforces Round 746 (Div. 2) {1592} | PROGRAMMING | 2000.0 | 95583 | |
| 1293 | Hidden Fortress | interactive math | Statement | H | Bubble Cup 14 - Finals Online Mirror (Unrated, ICPC Rules, Teams Preferred, Div. 1) {1599} | PROGRAMMING | BubbleCup2021.pdf | ||
| 5202 | Too Many Impostors (easy version) | constructive algorithms interactive | Statement | D1 | Codeforces Round 761 (Div. 2) {1617} | PROGRAMMING | 2000.0 | Editorial for Codeforces Round #761 (Div. 2) | |
| 2054 | Too Many Impostors (hard version) | constructive algorithms interactive | Statement | D2 | Codeforces Round 761 (Div. 2) {1617} | PROGRAMMING | 1000.0 | Editorial for Codeforces Round #761 (Div. 2) | |
| 7534 | Hidden Permutations | dfs and similar interactive math | Statement | C | Hello 2022 {1621} | PROGRAMMING | 1500.0 | ||
| 3839 | Interacdive Problem | binary search constructive algorithms interactive | Statement | F | Codeforces Round 764 (Div. 3) {1624} | PROGRAMMING | Codeforces Round #764 (Div. 3) Editorial | ||
| 3593 | Grid Xor | constructive algorithms greedy implementation interactive math | Statement | C | Codeforces Round 767 (Div. 1) {1628} | PROGRAMMING | 1250.0 | 99276 | |
| 384 | Perfect Matching | data structures interactive trees | Statement | F | Educational Codeforces Round 122 (Rated for Div. 2) {1633} | PROGRAMMING | 99539 | ||
| 4785 | Finding Zero | constructive algorithms greedy interactive | Statement | D | Codeforces Round 770 (Div. 2) {1634} | PROGRAMMING | 2000.0 | Codeforces Round #770 (Div. 2) editorial | |
| 0 | Treasure Hunt | graphs graphs graphs interactive interactive | Statement | D | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs graphs interactive interactive | Statement | C | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | A | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | B | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | E | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | F | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | G | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | H | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | I | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | J | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 0 | Treasure Hunt | graphs interactive | Statement | K | Pinely Treasure Hunt Contest {1639} | PROGRAMMING | |||
| 4700 | GCD Guess | bitmasks chinese remainder theorem constructive algorithms interactive math number theory | Statement | D | Codeforces Round 781 (Div. 2) {1665} | PROGRAMMING | 1500.0 | Codeforces Round #781 (Div. 2) Editorial | |
| 1780 | Interactive Treasure Hunt | brute force interactive math | Statement | I | 2021-2022 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1666} | PROGRAMMING | Tutorial (PDF) | ||
| 2527 | notepad.exe | binary search constructive algorithms greedy interactive | Statement | E | Codeforces Global Round 20 {1672} | PROGRAMMING | 1500.0 | Global Round 20 Editorial | 2200 |
| 967 | Anti-Theft Road Planning | bitmasks constructive algorithms divide and conquer greedy interactive math | Statement | F | Codeforces Round 785 (Div. 2) {1673} | PROGRAMMING | 3250.0 | Codeforces Round #785 (Div. 2) Editorial | |
| 4165 | Railway System | constructive algorithms dsu graphs greedy interactive sortings | Statement | B | Codeforces Round 796 (Div. 1) {1687} | PROGRAMMING | 750.0 | Editorial of Codeforces Round 796 | |
| 5022 | Guess The String | binary search brute force constructive algorithms dsu interactive | Statement | D | Educational Codeforces Round 130 (Rated for Div. 2) {1697} | PROGRAMMING | 103835 | ||
| 12272 | Fixed Point Guessing | binary search constructive algorithms interactive | Statement | D | Codeforces Round 803 (Div. 2) {1698} | PROGRAMMING | 1500.0 | Codeforces Round #803 (Div. 2) Editorial | |
| 701 | 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 | |
| 6269 | Tournament Countdown | constructive algorithms fft greedy greedy interactive number theory probabilities | Statement | D | Codeforces Round 812 (Div. 2) {1713} | PROGRAMMING | 2000.0 | Codeforces Round #812 (Div. 2) Editorial | 1800 |
| 595 | Crop Squares | constructive algorithms geometry interactive math | Statement | F | Codeforces Round 816 (Div. 2) {1715} | PROGRAMMING | 3000.0 | Codeforces Round #816 (Div. 2) editorial | |
| 517 | Matching Reduction | graph matchings interactive | Statement | F | Educational Codeforces Round 134 (Rated for Div. 2) {1721} | PROGRAMMING | 106416 | ||
| 7983 | Guess the Cycle Size | interactive probabilities | Statement | E | Codeforces Round 820 (Div. 3) {1729} | PROGRAMMING | Codeforces Round #820 (Div. 3) Editorial | ||
| 1395 | Connectivity Addicts | constructive algorithms dsu graphs greedy interactive shortest paths sortings trees | Statement | F | Codeforces Global Round 22 {1738} | PROGRAMMING | 2750.0 | Editorial of Codeforces Global Round <strong>22</strong> | |
| 1706 | Joking (Easy Version) | binary search bitmasks constructive algorithms interactive ternary search | Statement | E1 | Codeforces Global Round 23 {1746} | PROGRAMMING | 2000.0 | Codeforces Global Round 23 Editorial | |
| 487 | Joking (Hard Version) | dp interactive | Statement | E2 | Codeforces Global Round 23 {1746} | PROGRAMMING | 1750.0 | Codeforces Global Round 23 Editorial | |
| 155 | Centroid Guess | interactive probabilities trees | Statement | G | Pinely Round 1 (Div. 1 + Div. 2) {1761} | PROGRAMMING | 3500.0 | Pinely Round 1 (Div. 1 + Div. 2) Editorial | |
| 4392 | GCD Queries | interactive number theory | Statement | D | Codeforces Round 838 (Div. 2) {1762} | PROGRAMMING | 2000.0 | Codeforces Round #838 (Div. 2) Editorial | |
| 717 | Doremy's Perfect DS Class (Easy Version) | binary search interactive | Statement | G1 | Codeforces Global Round 24 {1764} | PROGRAMMING | 2000.0 | Codeforces Global Round 24 Editorial | |
| 654 | Doremy's Perfect DS Class (Medium Version) | binary search interactive | Statement | G2 | Codeforces Global Round 24 {1764} | PROGRAMMING | 500.0 | Codeforces Global Round 24 Editorial | |
| 577 | Doremy's Perfect DS Class (Hard Version) | binary search interactive | Statement | G3 | Codeforces Global Round 24 {1764} | PROGRAMMING | 500.0 | Codeforces Global Round 24 Editorial | |
| 481 | Guess the String | interactive | Statement | G | 2022-2023 ICPC, NERC, Southern and Volga Russian Regional Contest (Online Mirror, ICPC Rules, Preferably Teams) {1765} | PROGRAMMING | 109642 | 2600 | |
| 585 | Interactive Factorial Guessing | brute force games implementation interactive | Statement | I | 2022-2023 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1773} | PROGRAMMING | 2500 | ||
| 502 | Hot and Cold | binary search interactive | Statement | H | 2022-2023 ICPC, NERC, Northern Eurasia Onsite (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {1773} | PROGRAMMING | 2600 | ||
| 908 | Spinach Pizza | games geometry greedy interactive | Statement | I | SWERC 2022-2023 - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1776} | PROGRAMMING | |||
| 991 | Library game | games greedy interactive sortings | Statement | C | SWERC 2022-2023 - Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1776} | PROGRAMMING | |||
| 2051 | Anya's Simultaneous Exhibition | constructive algorithms data structures graphs greedy interactive sortings | Statement | E | Hello 2023 {1779} | PROGRAMMING | 2250.0 | ||
| 5862 | Bit Guessing Game | binary search bitmasks interactive | Statement | D | Codeforces Round 846 (Div. 2) {1780} | PROGRAMMING | 1500.0 | 111841 | |
| 8985 | Li Hua and Chess | brute force constructive algorithms greedy hashing interactive | Statement | C | Codeforces Round 864 (Div. 2) {1797} | PROGRAMMING | 1500.0 | Codeforces Round 864 (Div. 2) Editorial | |
| 16970 | Interview | binary search implementation interactive | Statement | E | Codeforces Round 859 (Div. 4) {1807} | PROGRAMMING | 114143 | ||
| 174 | Expected Twist | *special interactive | Statement | H | April Fools Day Contest 2023 {1812} | PROGRAMMING | Editorial of April Fools Day Contest 2023 | ||
| 6297 | Unmysterious Language | *special interactive strings | Statement | J | April Fools Day Contest 2023 {1812} | PROGRAMMING | Editorial of April Fools Day Contest 2023 | ||
| 3633 | Sum Graph | constructive algorithms graphs implementation interactive math shortest paths trees | Statement | B | Codeforces Round 865 (Div. 1) {1815} | PROGRAMMING | 1250.0 | Editorial of Codeforces Round #865 | 2000 |
| 381 | 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 | |
| 472 | 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 |
| 386 | Stuck Conveyor | binary search interactive | Statement | F | Codeforces Round 877 (Div. 2) {1838} | PROGRAMMING | 3000.0 | Codeforces Round #877 (Div. 2) Editorial | |
| 1551 | Decreasing Game | constructive algorithms dp greedy interactive | Statement | E | Codeforces Round 876 (Div. 2) {1839} | PROGRAMMING | 2750.0 | Codeforces Round #876 (Div. 2) Editorial | |
| 2815 | 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 | ||
| 1194 | 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 | ||
| 3752 | Rudolph and Mimic | constructive algorithms greedy implementation interactive | Statement | F | Codeforces Round 883 (Div. 3) {1846} | PROGRAMMING | |||
| 375 | Triangle Platinum? | implementation interactive | Statement | E | Codeforces Round 882 (Div. 2) {1847} | PROGRAMMING | 2750.0 | Tutorial | |
| 658 | Michael and Hotel | interactive trees | Statement | D | Codeforces Round 889 (Div. 1) {1854} | PROGRAMMING | 2000.0 | Editorial of Codeforces Round 889 (Div. 1 + Div. 2) | |
| 3829 | More Wrong | divide and conquer interactive | Statement | D | Codeforces Round 890 (Div. 2) supported by Constructor Institute {1856} | PROGRAMMING | 2000.0 | Codeforces Round #890 (Div. 2) Editorial | |
| 1272 | Rollbacks (Hard Version) | bitmasks data structures interactive trees | Statement | E2 | Codeforces Round 893 (Div. 2) {1858} | PROGRAMMING | 1000.0 | Codeforces Round #893 (Div. 2) Editorial | 2600 |
| 12719 | Salyg1n and the MEX Game | constructive algorithms data structures games greedy interactive | Statement | C | Codeforces Round 897 (Div. 2) {1867} | PROGRAMMING | 1250.0 | ||
| 4360 | Salyg1n and Array (simple version) | constructive algorithms interactive math | Statement | E1 | Codeforces Round 897 (Div. 2) {1867} | PROGRAMMING | 2000.0 | ||
| 3777 | Salyg1n and Array (hard version) | constructive algorithms interactive math | Statement | E2 | Codeforces Round 897 (Div. 2) {1867} | PROGRAMMING | 1000.0 | ||
| 1586 | Interactive Game with Coloring | brute force constructive algorithms graphs implementation interactive math trees | Statement | E | Educational Codeforces Round 155 (Rated for Div. 2) {1879} | PROGRAMMING | 120773 | 2400 | |
| 511 | Good Colorings | binary search constructive algorithms graphs interactive | Statement | E | Codeforces Round 905 (Div. 1) {1887} | PROGRAMMING | 2000.0 | Codeforces Round #905 (Div. 1, Div. 2, Div. 3) Editorial | |
| 432 | Pepe Racing | constructive algorithms interactive sortings | Statement | G | CodeTON Round 7 (Div. 1 + Div. 2, Rated, Prizes!) {1896} | PROGRAMMING | 3250.0 | CodeTON Round 7 (Div. 1 + Div. 2, Rated, Prizes!) Editorial | |
| 2535 | Geo Game | constructive algorithms dp games greedy interactive math | Statement | E | Codeforces Round 912 (Div. 2) {1903} | PROGRAMMING | 2250.0 | Codeforces Round #912 (Div. 2) Editorial | |
| 291 | Cursed Game | interactive | Statement | C | 2023-2024 ICPC, Asia Jakarta Regional Contest (Online Mirror, Unrated, ICPC Rules, Teams Preferred) {1906} | PROGRAMMING | problem_analysis.pdf | ||
| 2087 | ace5 and Task Order | binary search divide and conquer implementation interactive probabilities sortings | Statement | E | Codeforces Round 922 (Div. 2) {1918} | PROGRAMMING | 2500.0 | Codeforces Round #922 (Div. 2) Editorial | |
| 183 | Tree Diameter | interactive trees | Statement | H | Hello 2024 {1919} | PROGRAMMING | 5000.0 | 3500 | |
| 228 | Anti-Proxy Attendance | constructive algorithms interactive ternary search | Statement | F | Codeforces Round 921 (Div. 1) {1924} | PROGRAMMING | 3000.0 | Codeforces Round 921 (Div. 1, Div. 2) Editorial | |
| 367 | Interactive Mex Tree | interactive | Statement | H | think-cell Round 1 {1930} | PROGRAMMING | 3500.0 | think-cell Round 1 Editorial | |
| 1777 | XOR Break --- Game Version | bitmasks games greedy interactive | Statement | D2 | Codeforces Round 931 (Div. 2) {1934} | PROGRAMMING | 1250.0 | Tutorial | |
| 8137 | Find a Mine | constructive algorithms geometry greedy interactive math | Statement | C | Codeforces Round 931 (Div. 2) {1934} | PROGRAMMING | 1500.0 | Tutorial | |
| 8710 | Bitwise Operation Wizard | bitmasks constructive algorithms greedy interactive math | Statement | A | Codeforces Round 930 (Div. 1) {1936} | PROGRAMMING | 500.0 | Codeforces Round 930 (Div. 1, Div. 2) Editorial | |
| 30 | Draw Polygon Lines | *special constructive algorithms dp geometry interactive | Statement | A | XVIII Open Olympiad in Informatics - Final Stage, Day 1 (Unrated, Online Mirror, IOI rules) {1939} | PROGRAMMING | |||
| 957 | Arithmancy (Easy) | brute force constructive algorithms interactive strings | Statement | D1 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 2100 | |
| 325 | Arithmancy (Medium) | constructive algorithms interactive probabilities strings | Statement | D2 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 2600 | |
| 166 | Arithmancy (Hard) | interactive | Statement | D3 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 3100 | |
| 2280 | Cat, Fox and Maximum Array Split | brute force interactive math | Statement | D | Codeforces Round 945 (Div. 2) {1973} | PROGRAMMING | 2000.0 | Editorial for Codeforces Round #945 (Div. 2) | 2400 |
| 939 | Tensor | constructive algorithms graphs interactive | Statement | E | Codeforces Round 948 (Div. 2) {1977} | PROGRAMMING | 2500.0 | 129858 | 2600 |
| 446 | Kostyanych's Theorem | brute force graphs interactive | Statement | F | Codeforces Round 951 (Div. 2) {1979} | PROGRAMMING | 3000.0 | Codeforces Round 951 (Div. 2) Editorial | |
| 142 | Fumo Temple | interactive | Statement | H | EPIC Institute of Technology Round Summer 2024 (Div. 1 + Div. 2) {1987} | PROGRAMMING | 5000.0 | EPIC Institute of Technology Round Summer 2024 (Div. 1 + Div. 2) Editorial | |
| 1166 | Catch the Mole(Easy Version) | binary search constructive algorithms data structures interactive trees | Statement | E1 | Codeforces Round 960 (Div. 2) {1990} | PROGRAMMING | 2000.0 | Video Tutorial | |
| 1136 | Catch the Mole(Hard Version) | binary search data structures dfs and similar interactive trees | Statement | E2 | Codeforces Round 960 (Div. 2) {1990} | PROGRAMMING | 750.0 | Video Tutorial | |
| 5163 | Coloring Game | constructive algorithms games graphs greedy interactive | Statement | E | Pinely Round 4 (Div. 1 + Div. 2) {1991} | PROGRAMMING | 2000.0 | Video Tutorial | |
| 171 | Grid Game | constructive algorithms games greedy interactive | Statement | I | Pinely Round 4 (Div. 1 + Div. 2) {1991} | PROGRAMMING | 4000.0 | Video Tutorial | |
| 777 | Fortnite | interactive math | Statement | H | Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2) {1994} | PROGRAMMING | 3750.0 | Video Tutorial | |
| 14748 | Ruler (easy version) | binary search interactive ternary search | Statement | G1 | Codeforces Round 964 (Div. 4) {1999} | PROGRAMMING | Video Tutorial | ||
| 11265 | Ruler (hard version) | binary search interactive ternary search | Statement | G2 | Codeforces Round 964 (Div. 4) {1999} | PROGRAMMING | Video Tutorial | ||
| 12898 | Guess The Tree | binary search brute force greedy interactive trees | Statement | C | Codeforces Round 967 (Div. 2) {2001} | PROGRAMMING | 1500.0 | Video Tutorial | |
| 14726 | Password Cracking | brute force constructive algorithms interactive strings | Statement | C | Codeforces Round 973 (Div. 2) {2013} | PROGRAMMING | 1250.0 | 134298 | |
| 4093 | Asesino (Easy Version) | binary search constructive algorithms implementation interactive | Statement | D1 | Codeforces Round 978 (Div. 2) {2022} | PROGRAMMING | 1750.0 | Codeforces Round 978 (Div 2) Editorial | |
| 835 | Asesino (Hard Version) | interactive | Statement | D2 | Codeforces Round 978 (Div. 2) {2022} | PROGRAMMING | 2000.0 | Codeforces Round 978 (Div 2) Editorial | |
| 465 | Penchick and Even Medians | binary search constructive algorithms interactive | Statement | F | Codeforces Round 987 (Div. 2) {2031} | PROGRAMMING | 3000.0 | Codeforces Round 987 (Div. 2) Editorial | |
| 6261 | Genokraken | binary search constructive algorithms data structures graphs interactive trees two pointers | Statement | D | Codeforces Round 983 (Div. 2) {2032} | PROGRAMMING | 1750.0 | Codeforces Round 983 (Div. 2) Editorial | |
| 1696 | Library of Magic | binary search bitmasks constructive algorithms interactive | Statement | G | Codeforces Round 984 (Div. 3) {2036} | PROGRAMMING | Codeforces Round 984 (Div. 3) Editorial | ||
| 7475 | Kachina's Favorite Binary String | greedy interactive two pointers | Statement | E | Codeforces Round 988 (Div. 3) {2037} | PROGRAMMING | Video Tutorial | ||
| 2994 | Guess One Character | constructive algorithms interactive | Statement | G | 2024-2025 ICPC, NERC, Southern and Volga Russian Regional Contest (Unrated, Online Mirror, ICPC Rules, Preferably Teams) {2038} | PROGRAMMING | 1900 | ||
| 1606 | Broken Queries | binary search bitmasks interactive | Statement | E | Codeforces Round 994 (Div. 2) {2049} | PROGRAMMING | 2250.0 | Codeforces Round #994 (Div. 2) Editorial | |
| 72 | Hunting Hoglins in Hogwarts | interactive | Statement | H | 2024-2025 ICPC, NERC, Northern Eurasia Finals (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {2052} | PROGRAMMING | |||
| 741 | Secret Message | constructive algorithms math | Statement | G | Hello 2025 {2057} | PROGRAMMING | 3750.0 | ||
| 523 | Kevin and Teams | constructive algorithms graphs interactive | Statement | G | IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2) {2061} | PROGRAMMING | 3000.0 | IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2) Editorial | |
| 7269 | Object Identification | graphs implementation interactive | Statement | A | Codeforces Round 1004 (Div. 1) {2066} | PROGRAMMING | 750.0 | 139415 | |
| 79 | Minus Operator | interactive | Statement | E | 2025 ICPC Asia Pacific Championship - Online Mirror (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {2073} | PROGRAMMING | |||
| 375 | Secret Lilies and Roses | interactive | Statement | H | 2025 ICPC Asia Pacific Championship - Online Mirror (Unrated, Online Mirror, ICPC Rules, Teams Preferred) {2073} | PROGRAMMING | |||
| 6754 | Empty Triangle | geometry interactive probabilities | Statement | E | Codeforces Round 1009 (Div. 3) {2074} | PROGRAMMING | Codeforces Round 1009 (Div. 3) — Editorial | ||
| 3703 | Finding OR Sum | bitmasks constructive algorithms implementation interactive math | Statement | B | Codeforces Round 1008 (Div. 1) {2077} | PROGRAMMING | 1000.0 | Codeforces Round 1008 (Div. 1, Div. 2) Editorial | |
| 142 | Online Palindrome | brute force constructive algorithms interactive | Statement | F | Educational Codeforces Round 177 (Rated for Div. 2) {2086} | PROGRAMMING | Educational Codeforces Round 177 Editorial | ||
| 267 | Uppercase or Lowercase? | *special *special interactive | Statement | D | Kotlin Heroes: Episode 12 {2087} | PROGRAMMING | 141608 |