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683115 Watermelon brute force math Statement A Codeforces Beta Round 4 (Div. 2 Only) {4} PROGRAMMING 1200
14303 Hexadecimal's Numbers brute force implementation math Statement C Codeforces Beta Round 9 (Div. 2 Only) {9} PROGRAMMING Codeforces Beta Round #9 tutorial 1500
3842 Four Segments brute force constructive algorithms geometry implementation math Statement C Codeforces Beta Round 14 (Div. 2) {14} PROGRAMMING Codeforces Beta Round #14 tutorial 1800
21274 Noldbach problem brute force math number theory Statement A Codeforces Beta Round 17 {17} PROGRAMMING Codeforces Beta Round #17 Tutorial 1100
2420 Platforms brute force math Statement B Codeforces Beta Round 18 (Div. 2 Only) {18} PROGRAMMING Codeforces Beta Round #18(Div. 2) Tutorial 1700
3970 Accounting brute force math Statement A Codeforces Beta Round 30 (Codeforces format) {30} PROGRAMMING Codeforces Beta Round #30. Разбор C 1500
651 Collisions brute force implementation math Statement E Codeforces Beta Round 34 (Div. 2) {34} PROGRAMMING Codeforces Beta Round #34 (Div. 2) Разбор 2100
4017 Chess brute force implementation math Statement B School Personal Contest #1 (Winter Computer School 2010/11) - Codeforces Beta Round 38 (ACM-ICPC Rules) {38} PROGRAMMING Школьная индивидуальная олимпиада #1 - Codeforces Beta Round #38. (Разбор задачи D) 1200
18100 Triangular numbers brute force math Statement A Codeforces Beta Round 44 (Div. 2) {47} PROGRAMMING Codeforces Beta Round #44: tutorial 800
545 Savior brute force dsu math Statement D Codeforces Beta Round 56 {60} PROGRAMMING Solutions for Codeforces Beta Round #56 2400
204 Long sequence brute force math matrices Statement E Yandex.Algorithm 2011: Round 2 {86} PROGRAMMING Problemset analysis (Yandex, Round 2) 2600
113 Lucky Interval brute force math Statement E Codeforces Beta Round 84 (Div. 1 Only) {109} PROGRAMMING Tutorial 2600
3237 Petr# brute force data structures hashing strings Statement B Codeforces Beta Round 86 (Div. 1 Only) {113} PROGRAMMING Codeforces Beta Round #86 Editorial 1900
1440 Double Happiness brute force math number theory Statement C Codeforces Beta Round 86 (Div. 1 Only) {113} PROGRAMMING Codeforces Beta Round #86 Editorial 2200
5650 Elevator brute force implementation math Statement A School Regional Team Contest, Saratov, 2011 {120} PROGRAMMING Tutorial for school regional team contest of Saratov 1000
1596 Hot Bath binary search brute force math Statement A Codeforces Beta Round 93 (Div. 1 Only) {126} PROGRAMMING Tutorial 1900
13835 Students and Shoelaces brute force dfs and similar graphs implementation Statement B Codeforces Beta Round 94 (Div. 2 Only) {129} PROGRAMMING Problem D of Beta Round 94 1200
2474 Pairs of Numbers brute force dfs and similar math number theory Statement B Codeforces Testing Round 3 {134} PROGRAMMING 1800
2640 Rectangle and Square brute force geometry math Statement B Codeforces Beta Round 97 (Div. 1) {135} PROGRAMMING Codeforces Beta Round #97: editorial 1600
2820 Help Farmer brute force math Statement A Codeforces Round 102 (Div. 1) {142} PROGRAMMING Codeforces Round #102 — Editorial 1700
15411 Help Vasilisa the Wise 2 brute force math Statement A Codeforces Round 102 (Div. 2) {143} PROGRAMMING Codeforces Round #102 (Div. 2) 1200
13783 Another Problem on Strings binary search brute force dp math strings two pointers Statement C Codeforces Round 112 (Div. 2) {165} PROGRAMMING Codeforces Round #112 (Div. 2) Tutorial 1600
317 Plane of Tanks: Duel brute force dp math probabilities Statement D Codeforces Round 115 {175} PROGRAMMING Codeforces Round #115 — editorial A-E 2400
8757 Series of Crimes brute force geometry implementation Statement A Croc Champ 2012 - Round 2 (Unofficial Div. 2 Edition) {181} PROGRAMMING Croc Champ 2012 — Round 2 — Editorial 800
9228 Common Divisors brute force hashing implementation math strings Statement D Codeforces Round 117 (Div. 2) {182} PROGRAMMING Codeforces Round #117 (Div. 2) Разбор Задач 1400
4208 Counting Rhombi brute force math Statement B Codeforces Round 119 (Div. 2) {189} PROGRAMMING Codeforces Round #119 — Editorial 1400
11550 Funky Numbers binary search brute force implementation Statement A Codeforces Round 121 (Div. 2) {192} PROGRAMMING tutorial 1300
403 Fibonacci Number brute force math matrices Statement E Codeforces Round 122 (Div. 1) {193} PROGRAMMING Editoral Codeforces Round #122 2900
10118 Let's Watch Football binary search brute force math Statement A Codeforces Round 123 (Div. 2) {195} PROGRAMMING Codeforces Round #123 (Div. 2) Разбор Задач 1100
5343 Hometask brute force constructive algorithms greedy math Statement B Codeforces Round 131 (Div. 2) {214} PROGRAMMING Codeforces Round #131 Tutorial 1600
1090 Blackboard Fibonacci brute force math Statement B Codeforces Round 134 (Div. 1) {217} PROGRAMMING Editorial for Codeforces Round #134 2200
273 Bitonix' Patrol bitmasks brute force combinatorics dfs and similar math Statement D Codeforces Round 134 (Div. 1) {217} PROGRAMMING Editorial for Codeforces Round #134 2800
30222 Parallelepiped brute force geometry math Statement A Codeforces Round 138 (Div. 2) {224} PROGRAMMING 1100
8265 Non-square Equation binary search brute force math Statement B Codeforces Round 144 (Div. 2) {233} PROGRAMMING Editorial for Codeforces Round #144 1500
4703 View Angle brute force geometry math Statement C Codeforces Round 159 (Div. 2) {257} PROGRAMMING Codeforces Round #159 (Div. 2) Разбор Задач 1700
15353 Prime Matrix binary search brute force math number theory Statement B Codeforces Round 166 (Div. 2) {271} PROGRAMMING editroal 1400
632 Cube Problem brute force math number theory Statement C Croc Champ 2013 - Round 2 {293} PROGRAMMING Croc Champ 2013 — Round 2 — Editorial 2300
965 Minimum Modular brute force graphs math number theory Statement C Codeforces Round 183 (Div. 1) {303} PROGRAMMING Codeforces Round #183 Editorial 2700
12016 Pythagorean Theorem II brute force math Statement A Codeforces Round 183 (Div. 2) {304} PROGRAMMING Codeforces Round #183 Editorial 1300
2281 Continued Fractions brute force implementation math Statement B Codeforces Round 184 (Div. 2) {305} PROGRAMMING 7712 1600
9575 Simple Molecules brute force graphs math Statement B Codeforces Round 200 (Div. 2) {344} PROGRAMMING Codeforces Round #200 Tutorial 1300
9852 Fixed Points brute force implementation math Statement B Codeforces Round 201 (Div. 2) {347} PROGRAMMING Codeforces Round #201 Editorial 1200
28452 Jeff and Digits brute force implementation math Statement A Codeforces Round 204 (Div. 2) {352} PROGRAMMING 1100
5652 Vasya and Robot brute force greedy math Statement A Codeforces Round 206 (Div. 1) {354} PROGRAMMING Codeforces Round #206 — Editorial 1600
5705 Pair of Numbers binary search brute force data structures math two pointers Statement D Codeforces Round 209 (Div. 2) {359} PROGRAMMING Editorial Codeforces Round #209 (Div. 2) 2100
2500 Ghd brute force math probabilities Statement D Codeforces Round 213 (Div. 1) {364} PROGRAMMING Codeforces Round #213 Editorial 2600
843 Dima and Magic Guitar brute force implementation math Statement E Codeforces Round 214 (Div. 2) {366} PROGRAMMING Codeforces Round #214 (Div. 2) — Tutorial 2300
10812 Bear and Strings brute force greedy implementation math strings Statement B Codeforces Round 226 (Div. 2) {385} PROGRAMMING Codeforces Round #226 (Div. 2) — Editorial 1300
10545 Bear and Prime Numbers binary search brute force data structures dp implementation math number theory Statement C Codeforces Round 226 (Div. 2) {385} PROGRAMMING Codeforces Round #226 (Div. 2) — Editorial 1800
2523 Fly, freebies, fly! binary search brute force implementation Statement B Testing Round 9 {386} PROGRAMMING 1500
298 Physical Education and Buns brute force implementation math Statement D Codeforces Round 231 (Div. 2) {394} PROGRAMMING 2000.0
4555 Roman and Numbers bitmasks brute force combinatorics dp number theory Statement D Codeforces Round 235 (Div. 2) {401} PROGRAMMING Codeforces Round #235 (Div. 2) — Tutorial 2000
5165 Triangle brute force geometry implementation math Statement A Codeforces Round 239 (Div. 1) {407} PROGRAMMING Codeforces Round #239 Editorial 1700
1189 Curious Array brute force combinatorics implementation math Statement C Codeforces Round 239 (Div. 1) {407} PROGRAMMING Codeforces Round #239 Editorial 2500
3577 Predict Outcome of the Game brute force implementation math Statement C Codeforces Round 258 (Div. 2) {451} PROGRAMMING Codeforces Round #258 Editorial 1700
51875 Vasya and Socks brute force implementation math Statement A Codeforces Round 262 (Div. 2) {460} PROGRAMMING 13465 1000
13359 Little Dima and Equation brute force implementation math number theory Statement B Codeforces Round 262 (Div. 2) {460} PROGRAMMING 13465 1500
1036 Little Victor and Set brute force constructive algorithms math Statement D Codeforces Round 262 (Div. 2) {460} PROGRAMMING 13465 2500
381 Roland and Rose brute force geometry math sortings Statement E Codeforces Round 262 (Div. 2) {460} PROGRAMMING 13465 2700
29914 Caisa and Pylons brute force implementation math Statement B Codeforces Round 264 (Div. 2) {463} PROGRAMMING CF 264 Div 2 Tutorial 1200
1739 Caisa and Tree brute force dfs and similar math number theory trees Statement E Codeforces Round 264 (Div. 2) {463} PROGRAMMING CF 264 Div 2 Tutorial 2400
5259 Wonder Room brute force math Statement B Codeforces Round 266 (Div. 2) {466} PROGRAMMING Editorial Codeforces Round #266 (Div. 2) 1800
3732 MUH and House of Cards binary search brute force greedy math Statement C Codeforces Round 269 (Div. 2) {471} PROGRAMMING Codeforces Round #269 Editorial 1700
6459 CGCDSSQ brute force data structures math Statement D Bayan 2015 Contest Warm Up {475} PROGRAMMING Bayan 2015 Contest Warm Up Editorial 2000
36817 Dreamoon and WiFi bitmasks brute force combinatorics dp math probabilities Statement B Codeforces Round 272 (Div. 2) {476} PROGRAMMING 1300
111792 Expression brute force math Statement A Codeforces Round 274 (Div. 2) {479} PROGRAMMING Codeforces Round #274: editorial 1100
24841 Counterexample brute force implementation math number theory Statement A Codeforces Round 275 (Div. 2) {483} PROGRAMMING Codeforces Round #275 Editorial 1100
2262 Candy Boxes brute force constructive algorithms math Statement B Codeforces Round 278 (Div. 2) {488} PROGRAMMING Tutorial 1800
9462 Hacking Cypher brute force math number theory strings Statement C Codeforces Round 279 (Div. 2) {490} PROGRAMMING Codeforces Round #279 (Div. 2) Editorial 1700
2313 Chocolate brute force dfs and similar math meet-in-the-middle number theory Statement D Codeforces Round 279 (Div. 2) {490} PROGRAMMING Codeforces Round #279 (Div. 2) Editorial 1900
17162 Minimum Difficulty brute force implementation math Statement A Codeforces Round 283 (Div. 2) {496} PROGRAMMING Codeforces Round #283: editorial (with bonuses!) 1000
247 Gears brute force geometry math Statement D Codeforces Round 283 (Div. 1) {497} PROGRAMMING 2800
6394 Fox And Jumping bitmasks brute force dp math Statement D Codeforces Round 290 (Div. 2) {510} PROGRAMMING Codeforces Round #290 Editorial 2100
22588 Han Solo and Lazer Gun brute force data structures geometry implementation math Statement B Codeforces Round 291 (Div. 2) {514} PROGRAMMING Codeforces Round #291 (Div. 2) Editorial 1400
4157 Anya and Cubes binary search bitmasks brute force dp math meet-in-the-middle Statement E Codeforces Round 297 (Div. 2) {525} PROGRAMMING Codeforces Round #297 (Div.2) Editorial 2200
2646 Om Nom and Candies brute force greedy math Statement C ZeptoLab Code Rush 2015 {526} PROGRAMMING ZeptoLab Code Rush 2015 — Editorial 2000
6126 Tourist's Notes binary search brute force greedy implementation math Statement C Codeforces Round 300 {538} PROGRAMMING Codeforces Round #300 Editorial (+challenges) 1600
1858 A Heap of Heaps brute force data structures math sortings Statement F Codeforces Round 300 {538} PROGRAMMING Codeforces Round #300 Editorial (+challenges) 2200
233994 Soldier and Bananas brute force implementation math Statement A Codeforces Round 304 (Div. 2) {546} PROGRAMMING Codeforces Round #304 (Div.2) editorial 800
2746 Mike and Frog brute force greedy implementation math Statement A Codeforces Round 305 (Div. 1) {547} PROGRAMMING Codeforces Round #305 Editorial 1900
32057 Divisibility by Eight brute force dp math Statement C Codeforces Round 306 (Div. 2) {550} PROGRAMMING Разбор задач Codeforces Round #306 (Div. 2) 1500
5861 Vanya and Scales brute force dp greedy math meet-in-the-middle number theory Statement C Codeforces Round 308 (Div. 2) {552} PROGRAMMING Codeforces #308 (Div. 2) Editorial 1800
4839 Vanya and Triangles brute force combinatorics data structures geometry math sortings Statement D Codeforces Round 308 (Div. 2) {552} PROGRAMMING Codeforces #308 (Div. 2) Editorial 1900
1733 Vanya and Brackets brute force dp expression parsing greedy implementation strings Statement E Codeforces Round 308 (Div. 2) {552} PROGRAMMING Codeforces #308 (Div. 2) Editorial 2300
14474 Kyoya and Photobooks brute force math strings Statement A Codeforces Round 309 (Div. 2) {554} PROGRAMMING Codeforces Round #309 Editorial 900
4209 Arthur and Table brute force data structures dp greedy math sortings Statement C Codeforces Round 311 (Div. 2) {557} PROGRAMMING Codeforces Round #311 (Div.2) Editorial 1900
4202 Amr and Chemistry brute force graphs greedy math shortest paths Statement C Codeforces Round 312 (Div. 2) {558} PROGRAMMING Codeforces Round #312 (Div. 2) Editorial 2000
10886 Gerald's Hexagon brute force geometry math Statement A Codeforces Round 313 (Div. 1) {559} PROGRAMMING Codeforces Round 313 — Extended editoral 1600
5397 Primes or Palindromes? brute force implementation math number theory Statement A Codeforces Round 315 (Div. 1) {568} PROGRAMMING Codeforces Round #315 Editorial 1700
319 Sign Posts brute force geometry math Statement D Codeforces Round 315 (Div. 1) {568} PROGRAMMING Codeforces Round #315 Editorial 2800
4668 Three Logos bitmasks brute force constructive algorithms geometry implementation math Statement D Codeforces Round 322 (Div. 2) {581} PROGRAMMING Codeforces Round #322 (Div.2) Editorial 1700
11076 Dima and Lisa brute force math number theory Statement D Codeforces Round 324 (Div. 2) {584} PROGRAMMING Tutorial 1700
2727 Spongebob and Squares brute force math Statement D Codeforces Round 332 (Div. 2) {599} PROGRAMMING Editorial Codeforces Round #332 (Div. 2) 1800
1083 Rat Kwesh and Cheese brute force constructive algorithms math Statement D Codeforces Round 341 (Div. 2) {621} PROGRAMMING Editorial 2200
4613 Block Towers brute force greedy math number theory Statement C 8VC Venture Cup 2016 - Elimination Round {626} PROGRAMMING 23522 1600
4562 Longest Subsequence brute force math number theory Statement D Educational Codeforces Round 9 {632} PROGRAMMING 43493 2200
14656 Ebony and Ivory brute force math number theory Statement A Manthan, Codefest 16 {633} PROGRAMMING Manthan, Codefest 16: Editorials 1200
7225 A Trivial Problem brute force constructive algorithms math number theory Statement B Manthan, Codefest 16 {633} PROGRAMMING Manthan, Codefest 16: Editorials 1300
3044 Fibonacci-ish brute force dp hashing implementation math Statement D Manthan, Codefest 16 {633} PROGRAMMING Manthan, Codefest 16: Editorials 2000
2422 Binary Table bitmasks brute force divide and conquer dp fft math Statement C CROC 2016 - Final Round [Private, For Onsite Finalists Only] {662} PROGRAMMING Editorial for CROC 2016 Finals and Codeforces Round #347 2800
18604 Holidays brute force constructive algorithms greedy math Statement A Codeforces Round 350 (Div. 2) {670} PROGRAMMING Codeforces Round #350 (Div.2) Editorial 1000
7728 Restoring Painting brute force constructive algorithms math Statement B Codeforces Round 353 (Div. 2) {675} PROGRAMMING Tutorial 1400
342 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
4493 Robbers' watch brute force combinatorics dp math Statement A Codeforces Round 359 (Div. 1) {685} PROGRAMMING Codeforces Round #359 Editorial 1700
5985 Barnicle brute force implementation math strings Statement B Codeforces Round 362 (Div. 2) {697} PROGRAMMING 1400
13575 Powers of Two brute force data structures implementation math Statement B Educational Codeforces Round 15 {702} PROGRAMMING 46324 1500
4222 Batch Sort brute force greedy implementation math Statement B Intel Code Challenge Final Round (Div. 1 + Div. 2, Combined) {724} PROGRAMMING Tutorial 1500
17925 Transformation: from A to B brute force dfs and similar math Statement A Technocup 2017 - Elimination Round 1 (Unofficially Open for Everyone, Rated for Div. 2) {727} PROGRAMMING Tutorial 1100
3137 Video Cards brute force data structures implementation math number theory Statement F Codeforces Round 376 (Div. 2) {731} PROGRAMMING 47840 1900
88347 Buy a Shovel brute force constructive algorithms implementation math Statement A Codeforces Round 377 (Div. 2) {732} PROGRAMMING Codeforces Round #377 (Div. 2) Editorial 800
31883 Anton and Digits brute force greedy implementation math Statement B Codeforces Round 379 (Div. 2) {734} PROGRAMMING Tutorial of Codeforces Round #379 (Div. 2) 800
2617 Gosha is hunting brute force data structures dp flows math probabilities sortings Statement E Codeforces Round 381 (Div. 1) {739} PROGRAMMING 48582 2900
10040 Arpa’s obvious problem and Mehrdad’s terrible solution brute force math number theory Statement B Codeforces Round 383 (Div. 2) {742} PROGRAMMING Test data 1500
13385 Vladik and fractions brute force constructive algorithms math number theory Statement C Codeforces Round 384 (Div. 2) {743} PROGRAMMING Codeforces Round #384 Editorial 1500
11162 Display Size brute force math Statement A Codeforces Round 387 (Div. 2) {747} PROGRAMMING 49171 1000
481 Igor and Interesting Numbers brute force combinatorics dp math Statement F Codeforces Round 387 (Div. 2) {747} PROGRAMMING 49171 2600
92149 New Year and Hurry binary search brute force implementation math Statement A Good Bye 2016 {750} PROGRAMMING Good Bye 2016 — hints and codes 800
19752 PolandBall and Hypothesis brute force graphs math number theory Statement A 8VC Venture Cup 2017 - Elimination Round {755} PROGRAMMING 8VC Venture Cup 2017 — Elimination Round [Editorial] 900
712 Geometrical Progression brute force math number theory Statement F Codeforces Round 392 (Div. 2) {758} PROGRAMMING Codeforces Round #392 (Div. 2) Editorial 2500
15110 Dasha and Stairs brute force constructive algorithms implementation math Statement A Codeforces Round 394 (Div. 2) {761} PROGRAMMING Codeforces Round #394 (Div. 2) [Editorial] 1100
7054 Dasha and friends brute force implementation math Statement B Codeforces Round 394 (Div. 2) {761} PROGRAMMING Codeforces Round #394 (Div. 2) [Editorial] 1300
776 Timofey and remoduling brute force implementation math number theory Statement C Codeforces Round 395 (Div. 1) {763} PROGRAMMING Codeforces Round #395 [Editorial] 2500
17085 Taymyr is calling you brute force implementation math Statement A Codeforces Round 395 (Div. 2) {764} PROGRAMMING Codeforces Round #395 [Editorial] 800
115 Math, math everywhere brute force dp math meet-in-the-middle number theory Statement G Codeforces Round 397 by Kaspersky Lab and Barcelona Bootcamp (Div. 1 + Div. 2 combined) {765} PROGRAMMING Codeforces Round #397 Editorial 2800
1121 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
6237 Molly's Chemicals binary search brute force data structures implementation math Statement C ICM Technex 2017 and Codeforces Round 400 (Div. 1 + Div. 2, combined) {776} PROGRAMMING ICM Technex 2017 and Codeforces Round #400 (Div. 1 + Div. 2, combined) Editorial 1800
12174 The Monster brute force math number theory Statement A Codeforces Round 406 (Div. 2) {787} PROGRAMMING Codeforces Round #406 Editorial 1300
4904 Masha and geometric depression brute force implementation math Statement B Codeforces Round 407 (Div. 2) {789} PROGRAMMING Codeforces Round #407(Div.1 + Div.2) Editorial 1700
4426 The Golden Age brute force math Statement B Educational Codeforces Round 22 {813} PROGRAMMING 52410 1700
1600 Karen and Test brute force combinatorics constructive algorithms math Statement B Codeforces Round 419 (Div. 1) {815} PROGRAMMING Codeforces Round #419 Editorial 2200
8446 Really Big Numbers binary search brute force dp math Statement C Educational Codeforces Round 23 {817} PROGRAMMING 52638 1600
6045 Okabe and Banana Trees brute force math Statement B Codeforces Round 420 (Div. 2) {821} PROGRAMMING Tutorial 1300
3282 My pretty girl Noora brute force dp greedy math number theory Statement D Codeforces Round 422 (Div. 2) {822} PROGRAMMING Codeforces Round #422 (Div. 2) Editorial 1800
1306 Bamboo Partition brute force data structures implementation math number theory sortings two pointers Statement C Codeforces Round 424 (Div. 1, rated, based on VK Cup Finals) {830} PROGRAMMING Codeforces Round #424 Editorial 2500
507 Ever-Hungry Krakozyabra brute force combinatorics greedy math Statement C Codeforces Round 426 (Div. 1) {833} PROGRAMMING Codeforces Round #426 Editorial 2600
1078 Prefix Sums binary search brute force combinatorics math matrices Statement F Educational Codeforces Round 26 {837} PROGRAMMING 53662 2500
1008 Mother of Dragons brute force graphs math meet-in-the-middle Statement E Codeforces Round 428 (Div. 2) {839} PROGRAMMING Codeforces Round #428 editorial 2600
2837 Math Show brute force greedy Statement B Educational Codeforces Round 28 {846} PROGRAMMING 54357 1800
3375 Five Dimensional Points brute force geometry math Statement A Codeforces Round 432 (Div. 1, based on IndiaHacks Final Round 2017) {850} PROGRAMMING Codeforces Round #432 editorial 1700
532 Random Elections bitmasks brute force divide and conquer fft math Statement E Codeforces Round 432 (Div. 1, based on IndiaHacks Final Round 2017) {850} PROGRAMMING Codeforces Round #432 editorial 2800
427 Digits brute force implementation math Statement A Bubble Cup X - Finals [Online Mirror] {852} PROGRAMMING Tutorial 2700
14509 Fraction brute force constructive algorithms math Statement A Codeforces Round 433 (Div. 2, based on Olympiad of Metropolises) {854} PROGRAMMING 900
8986 k-rounding brute force math number theory Statement A Технокубок 2018 - Отборочный Раунд 1 {858} PROGRAMMING Codeforces Round 434 Div.1+Div.2 (and Technocup 2018 — Elimination Round 1) Editorial 1200
7895 Lazy Security Guard brute force geometry math Statement B MemSQL Start[c]UP 3.0 - Round 1 {859} PROGRAMMING Tutorial 1000
81 Egg Roulette bitmasks brute force divide and conquer math meet-in-the-middle Statement F MemSQL Start[c]UP 3.0 - Round 2 (onsite finalists) {865} PROGRAMMING MemSQL Start[c]UP 3.0 Round 2 Editorial 3300
10249 Classroom Watch brute force math Statement A Codeforces Round 441 (Div. 1, by Moscow Team Olympiad) {875} PROGRAMMING Codeforces Round #441. Editorial. 1200
14178 Pride brute force dp greedy math number theory Statement A Codeforces Round 446 (Div. 1) {891} PROGRAMMING Codeforces Round #446 Editorial 1600
1456 Restoring the Expression brute force hashing math Statement F Codeforces Round 451 (Div. 2) {898} PROGRAMMING Codeforces Round #451 (Div.2) Editorial 2300
4997 Remove Extra One brute force data structures math Statement C Codeforces Round 450 (Div. 2) {900} PROGRAMMING Codeforces Round #450(Div. 2). Editorial. 1700
1322 Seating of Students brute force constructive algorithms math Statement B Codeforces Round 454 (Div. 1, based on Technocup 2018 Elimination Round 4) {906} PROGRAMMING Editorial Codeforces Round 454 (and Technocup 2018 — Elimination Round 4) 2300
7197 New Year and Curling brute force geometry implementation math Statement C Good Bye 2017 {908} PROGRAMMING Good Bye 2017 Editorial 1500
5100 Inversion Counting brute force math Statement D Educational Codeforces Round 35 (Rated for Div. 2) {911} PROGRAMMING T 1700
15703 Perfect Squares brute force implementation math Statement A Codecraft-18 and Codeforces Round 458 (Div. 1 + Div. 2, combined) {914} PROGRAMMING Tutorial 1100
9538 Jamie and Alarm Snooze brute force implementation math Statement A Codeforces Round 457 (Div. 2) {916} PROGRAMMING Codeforces Round #457 (Div. 2) Editorial 1200
1980 List Of Integers binary search bitmasks brute force combinatorics math number theory Statement G Educational Codeforces Round 37 (Rated for Div. 2) {920} PROGRAMMING T 2300
13071 Friends Meeting brute force greedy implementation math Statement A Codeforces Round 468 (Div. 2, based on Technocup 2018 Final Round) {931} PROGRAMMING Codeforces Round #468 and Technocup 2018 Final Round Analysis 800
388 A Creative Cutout brute force combinatorics math Statement D Codeforces Round 462 (Div. 1) {933} PROGRAMMING 57763 2900
7253 Vile Grasshoppers brute force math number theory Statement B Codeforces Round 467 (Div. 2) {937} PROGRAMMING Codeforces Round #467, Editorial 1500
1776 Guard Duty (easy) brute force geometry greedy math Statement E1 Helvetic Coding Contest 2018 online mirror (teams allowed, unrated) {958} PROGRAMMING helvetic-coding-contest-2018-editorial.pdf 1800
8351 Make a Square brute force implementation math Statement C Educational Codeforces Round 42 (Rated for Div. 2) {962} PROGRAMMING Educational Codeforces Round 42 Editorial 1400
670 Cutting Rectangle brute force math number theory Statement C Tinkoff Internship Warmup Round 2018 and Codeforces Round 475 (Div. 1) {963} PROGRAMMING Editorial Tinkoff Internship Warmup Round 2018 and Codeforces Round #475 (Div. 1 + Div. 2) 2600
9924 Almost Arithmetic Progression brute force implementation math Statement D Codeforces Round 481 (Div. 3) {978} PROGRAMMING T 1500
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
893 Prince's Problem brute force data structures math number theory trees Statement E Codeforces Round 485 (Div. 1) {986} PROGRAMMING Codeforces Round #485 Editorial 2900
8027 Points and Powers of Two brute force math Statement D Codeforces Round 486 (Div. 3) {988} PROGRAMMING 59810 1800
3724 Bus Number brute force combinatorics math Statement E Codeforces Round 491 (Div. 2) {991} PROGRAMMING 60181 1800
340 Concise and clear brute force greedy implementation math Statement F Codeforces Round 491 (Div. 2) {991} PROGRAMMING 60181 2800
1749 Nastya and a Game brute force implementation math Statement D Codeforces Round 489 (Div. 2) {992} PROGRAMMING 60083 2100
2049 Leaving the Bar brute force data structures geometry greedy math sortings Statement C Codeforces Round 492 (Div. 1) [Thanks, uDebug!] {995} PROGRAMMING Editorial for Codeforces Round #492 [Thanks u-Debug!] 2200
8653 Convert to Ones brute force greedy implementation math Statement A Codeforces Round 493 (Div. 1) {997} PROGRAMMING 60357 1500
3135 Roman Digits brute force combinatorics dp greedy math Statement B Codeforces Round 493 (Div. 1) {997} PROGRAMMING 60357 2000
11485 Intense Heat brute force implementation math Statement C Codeforces Round 494 (Div. 3) {1003} PROGRAMMING 60417 1300
1037 Pave the Parallelepiped bitmasks brute force combinatorics math number theory Statement B Codeforces Round 497 (Div. 1) {1007} PROGRAMMING Editorial for Codeforces Round #497 by Skyglow 2400
6625 Relatively Prime Graph brute force constructive algorithms graphs greedy math Statement D Educational Codeforces Round 47 (Rated for Div. 2) {1009} PROGRAMMING 60630 1700
6673 Photo of The Sky brute force implementation math sortings Statement A Codeforces Round 500 (Div. 1) [based on EJOI] {1012} PROGRAMMING 60920 1500
943 The Neutral Zone brute force math Statement F Codeforces Round 502 (in memory of Leopoldo Taravilse, Div. 1 + Div. 2) {1017} PROGRAMMING Разбор (англ.) 2500
8497 Weakened Common Divisor brute force greedy number theory Statement B Codeforces Round 505 (rated, Div. 1 + Div. 2, based on VK Cup 2018 Final) {1025} PROGRAMMING Codeforces Round #505 Editorial 1600
4113 Recovering BST brute force dp math number theory trees Statement D Codeforces Round 505 (rated, Div. 1 + Div. 2, based on VK Cup 2018 Final) {1025} PROGRAMMING Codeforces Round #505 Editorial 2000
2749 Multicolored Markers binary search brute force math number theory Statement F Codeforces Round 506 (Div. 3) {1029} PROGRAMMING Codeforces Round #506 (Div. 3) Editorial 2100
310 Familiar Operations brute force graphs math Statement F Technocup 2019 - Elimination Round 2 {1031} PROGRAMMING Codeforces Round #517 and Technocup 2019 Elimination Round 2 Editorial 2700
461 Boolean Computer bitmasks brute force fft math Statement F Lyft Level 5 Challenge 2018 - Elimination Round {1033} PROGRAMMING The Lyft Level 5 Challenge 2018 Elimination Round (Div. 1 + Div. 2) Editorial 2800
1094 Maximum Matching bitmasks brute force dfs and similar dp graphs Statement E Codeforces Round 508 (Div. 2) {1038} PROGRAMMING Tutorial 2400
4757 Mysterious Crime brute force combinatorics math meet-in-the-middle two pointers Statement D Codeforces Round 519 by Botan Investments {1043} PROGRAMMING Codeforces Round #519 Editorial 1700
9868 Vasya and Multisets brute force dp greedy implementation math Statement C Educational Codeforces Round 51 (Rated for Div. 2) {1051} PROGRAMMING Educational Codeforces Round 51 Editorial 1400
472 Candies for Children brute force math Statement D Codeforces Round 516 (Div. 1, by Moscow Team Olympiad) {1063} PROGRAMMING Editorial 2800
25073 Make a triangle! brute force geometry math Statement A Codeforces Round 516 (Div. 2, by Moscow Team Olympiad) {1064} PROGRAMMING Codeforces Round #516 (by Moscow Team Olympiad) — Editorial 700
18554 New Year and the Christmas Ornament brute force implementation math Statement A Good Bye 2018 {1091} PROGRAMMING Editorial 900
139 Mateusz and an Infinite Sequence bitmasks brute force dp strings Statement H Hello 2019 {1097} PROGRAMMING 64310 3000
1796 Nice table brute force constructive algorithms greedy math Statement B Codeforces Round 530 (Div. 1) {1098} PROGRAMMING 64331 2300
25136 Divisors of Two Integers brute force greedy math number theory Statement B Codeforces Round 535 (Div. 3) {1108} PROGRAMMING 64751 1100
12640 Nice Garland brute force greedy math Statement C Codeforces Round 535 (Div. 3) {1108} PROGRAMMING 64751 1300
1499 Sasha and Interesting Fact from Graph Theory brute force combinatorics dp math trees Statement D Codeforces Round 539 (Div. 1) {1109} PROGRAMMING Codeforces Round #539 Editorial 2600
6508 Average Superhero Gang Power brute force implementation math Statement B CodeCraft-19 and Codeforces Round 537 (Div. 2) {1111} PROGRAMMING CodeCraft-19 and Codeforces Round #537 (Div. 2) Editorial 1600
6878 Creative Snap binary search brute force divide and conquer math Statement C CodeCraft-19 and Codeforces Round 537 (Div. 2) {1111} PROGRAMMING CodeCraft-19 and Codeforces Round #537 (Div. 2) Editorial 1700
7823 Trailing Loves (or L'oeufs?) brute force implementation math number theory Statement C Codeforces Round 538 (Div. 2) {1114} PROGRAMMING Codeforces Round #538 (Div. 2) Editorial 1700
4199 Circus brute force greedy math strings Statement B Codeforces Round 545 (Div. 2) {1138} PROGRAMMING Codeforces Round #545 – Editorial 1700
3578 The Beatles brute force math Statement A Codeforces Round 549 (Div. 1) {1142} PROGRAMMING Codeforces Round #549 Editorial 1800
11530 Nirvana brute force math number theory Statement B Codeforces Round 549 (Div. 2) {1143} PROGRAMMING Codeforces Round #549 Editorial 1300
7063 Neko does Maths brute force math number theory Statement C Codeforces Round 554 (Div. 2) {1152} PROGRAMMING T 1800
12096 Serval and Bus brute force math Statement A Codeforces Round 551 (Div. 2) {1153} PROGRAMMING Editorial 1100
3247 Minimum Possible LCM brute force greedy math number theory Statement G Codeforces Round 552 (Div. 3) {1154} PROGRAMMING Codeforces Round #552 (Div. 3) Editorial 2400
1598 Guess the Root brute force interactive math Statement E Educational Codeforces Round 63 (Rated for Div. 2) {1155} PROGRAMMING 66687 2200
3575 Power Transmission (Easy Edition) brute force geometry Statement C1 Codeforces Round 558 (Div. 2) {1163} PROGRAMMING 66943 1900
1008 Magical Permutation bitmasks brute force constructive algorithms data structures graphs math Statement E Codeforces Round 558 (Div. 2) {1163} PROGRAMMING 66943 2800
3006 The LCMs Must be Large bitmasks brute force constructive algorithms math number theory Statement E Codeforces Round 561 (Div. 2) {1166} PROGRAMMING Codeforces Round #561 (Div. 2) Editorial 2000
2282 Cute Sequences binary search brute force greedy math Statement D Codeforces Round 561 (Div. 2) {1166} PROGRAMMING Codeforces Round #561 (Div. 2) Editorial 2100
16349 Lost Numbers brute force divide and conquer interactive math Statement B Educational Codeforces Round 65 (Rated for Div. 2) {1167} PROGRAMMING 67058 1400
2643 The Number of Subpermutations brute force data structures divide and conquer hashing math Statement F Educational Codeforces Round 66 (Rated for Div. 2) {1175} PROGRAMMING Editorial 2600
2251 Topforces Strikes Back brute force math sortings Statement F Codeforces Round 570 (Div. 3) {1183} PROGRAMMING Tutorial 2400
6575 Heidi Learns Hashing (Easy) brute force math number theory Statement A1 Helvetic Coding Contest 2019 online mirror (teams allowed, unrated) {1184} PROGRAMMING helvetic-coding-contest-2019-editorial.pdf 1200
7808 Exam in BerSU (hard version) brute force data structures greedy math Statement C2 Codeforces Round 568 (Div. 2) {1185} PROGRAMMING Editorial for Codeforces Round #568 (Div. 2) 1700
21868 Sport Mafia binary search brute force math Statement B Codeforces Round 574 (Div. 2) {1195} PROGRAMMING Разбор Codeforces Round #574 (Div. 2) 1100
29109 Three Piles of Candies brute force constructive algorithms math Statement A Codeforces Round 575 (Div. 3) {1196} PROGRAMMING Editorial 700
1162 Graph Traveler brute force data structures dfs and similar dp graphs implementation math number theory Statement F Codeforces Round 578 (Div. 2) {1200} PROGRAMMING Codeforces Round #578 (Div. 2) Editorial 2500
2763 You Are Given a WASD-string... brute force data structures dp greedy implementation math strings Statement C Educational Codeforces Round 70 (Rated for Div. 2) {1202} PROGRAMMING 68972 2100
23369 There Are Two Types Of Burgers brute force greedy implementation math Statement A Educational Codeforces Round 71 (Rated for Div. 2) {1207} PROGRAMMING Educational Codeforces Round 71 Editorial 700
348 Marek and Matching (easy version) brute force probabilities Statement F1 Dasha Code Championship - SPb Finals Round (only for onsite-finalists) {1210} PROGRAMMING Dasha Code Championship Finals and Mirror Round 588 Editorial 2900
426 Marek and Matching (hard version) brute force probabilities Statement F2 Dasha Code Championship - SPb Finals Round (only for onsite-finalists) {1210} PROGRAMMING Dasha Code Championship Finals and Mirror Round 588 Editorial 3100
12159 Equalizing by Division (hard version) brute force math sortings Statement D2 Codeforces Round 582 (Div. 3) {1213} PROGRAMMING Codeforces Round #582 (Div. 3) Editorial 1600
11464 Badges brute force math Statement B Codeforces Round 583 (Div. 1 + Div. 2, based on Olympiad of Metropolises) {1214} PROGRAMMING Tutorial 1100
9485 Optimal Currency Exchange brute force math Statement A Codeforces Round 583 (Div. 1 + Div. 2, based on Olympiad of Metropolises) {1214} PROGRAMMING Tutorial 1300
3718 Numerical Sequence (easy version) binary search brute force math Statement E1 Codeforces Round 587 (Div. 3) {1216} PROGRAMMING Codeforces Round #587 (Div. 3) Editorial 1900
18139 2048 Game brute force greedy math Statement A Educational Codeforces Round 73 (Rated for Div. 2) {1221} PROGRAMMING Разбор Educational Codeforces Round 73 1000
9774 p-binary bitmasks brute force math Statement C Technocup 2020 - Elimination Round 2 {1225} PROGRAMMING 70898 1600
17237 Stones brute force greedy math Statement A Codeforces Round 593 (Div. 2) {1236} PROGRAMMING 70654 800
8264 The Football Season brute force math number theory Statement C Codeforces Round 592 (Div. 2) {1244} PROGRAMMING Codeforces Round #592 (Div. 2) Tutorial 1900
2798 The Feast and the Bus brute force constructive algorithms greedy math Statement B 2019-2020 ICPC, NERC, Southern and Volga Russian Regional Contest (Online Mirror, ICPC Rules, Teams Preferred) {1250} PROGRAMMING 1900
637 Invertation in Tournament brute force divide and conquer graphs math Statement D Codeforces Round 609 (Div. 1) {1268} PROGRAMMING Codeforces Round #609 — Editorial 3100
23967 Equation brute force math Statement A Codeforces Round 609 (Div. 2) {1269} PROGRAMMING Codeforces Round #609 — Editorial 800
15662 Suits brute force greedy math Statement A Codeforces Round 608 (Div. 2) {1271} PROGRAMMING 72247 900
22043 Three Friends brute force greedy math sortings Statement A Codeforces Round 605 (Div. 3) {1272} PROGRAMMING Codeforces Round #605 (Div. 3) Editorial 900
1776 Beautiful Rectangle brute force combinatorics constructive algorithms data structures greedy math Statement C Codeforces Round 606 (Div. 1, based on Technocup 2020 Elimination Round 4) {1276} PROGRAMMING Technocup 2020 — Elimination Round 4 + Codeforces Round 606: Editorial 2300
28004 Fadi and LCM brute force math number theory Statement C Codeforces Round 613 (Div. 2) {1285} PROGRAMMING Codeforces Round #613 (Div. 2) Editorial 1400
1577 Madhouse (Easy version) brute force constructive algorithms interactive math Statement C1 Codeforces Round 612 (Div. 1) {1286} PROGRAMMING Codeforces Round #612 - Editorial 2400
744 Madhouse (Hard version) brute force constructive algorithms hashing interactive math Statement C2 Codeforces Round 612 (Div. 1) {1286} PROGRAMMING Codeforces Round #612 - Editorial 2900
294 Harry The Potter brute force constructive algorithms dp fft implementation math Statement F Codeforces Round 612 (Div. 1) {1286} PROGRAMMING Codeforces Round #612 - Editorial 3200
19311 Deadline binary search brute force math ternary search Statement A Educational Codeforces Round 80 (Rated for Div. 2) {1288} PROGRAMMING Educational Codeforces Round 80 Editorial 1100
12539 Anu Has a Function brute force greedy math Statement A Codeforces Round 618 (Div. 1) {1299} PROGRAMMING 500.0 Codeforces Round #618 Editorial 1500
18670 Kuroni and Impossible Calculation brute force combinatorics math number theory Statement C Ozon Tech Challenge 2020 (Div.1 + Div.2, Rated, T-shirts + prizes!) {1305} PROGRAMMING 1250.0 Ozon Tech Challenge 2020 Editorial 1600
12587 Cow and Message brute force dp math strings Statement C Codeforces Round 621 (Div. 1 + Div. 2) {1307} PROGRAMMING 1500.0 Codeforces Round #621 (Div. 1 + Div. 2) Editorial 1500
9889 Three Integers brute force math Statement D Codeforces Round 624 (Div. 3) {1311} PROGRAMMING 74224 1900
3546 Infinite Path brute force dfs and similar graphs math number theory Statement D Educational Codeforces Round 84 (Rated for Div. 2) {1327} PROGRAMMING Educational Codeforces Round 84 Editorial 2200
18917 Composite Coloring brute force constructive algorithms greedy math number theory Statement B Codeforces Round 630 (Div. 2) {1332} PROGRAMMING 1000.0 Codeforces Round #630 Editorial 1500
4128 Challenges in school №41 brute force constructive algorithms games graphs greedy implementation sortings Statement D Codeforces Round 632 (Div. 2) {1333} PROGRAMMING 1750.0 Codeforces Round #632 (Div. 2) editorial
17883 Circle of Monsters brute force constructive algorithms greedy math Statement C Educational Codeforces Round 85 (Rated for Div. 2) {1334} PROGRAMMING Educational Codeforces Round 85 Editorial
826 Chiori and Doll Picking (easy version) bitmasks brute force combinatorics math Statement E1 Codeforces Round 635 (Div. 1) {1336} PROGRAMMING 1750.0 Codeforces Round #635 Editorial 2600
480 Chiori and Doll Picking (hard version) bitmasks brute force combinatorics math Statement E2 Codeforces Round 635 (Div. 1) {1336} PROGRAMMING 1500.0 Codeforces Round #635 Editorial 3400
3436 Perfect Triples bitmasks brute force constructive algorithms divide and conquer greedy implementation math Statement C Codeforces Round 633 (Div. 1) {1338} PROGRAMMING 1500.0 Editorial
53258 Candies brute force math Statement A Codeforces Round 636 (Div. 3) {1343} PROGRAMMING 76352 900
28217 Card Constructions binary search brute force dp math Statement B Codeforces Round 639 (Div. 2) {1345} PROGRAMMING 1000.0 Codeforces Round #639 Editorial 1100