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1 2 3 4 >Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 4491 | How many trees? | combinatorics divide and conquer dp | Statement | D | Codeforces Beta Round 9 (Div. 2 Only) {9} | PROGRAMMING | Codeforces Beta Round #9 tutorial | 2000 | |
| 673 | Triangles | combinatorics dp | Statement | E | Codeforces Beta Round 15 {15} | PROGRAMMING | Codeforces Beta #15 Tutorial (Incomplete) | 2600 | |
| 1009 | Parquet | combinatorics constructive algorithms | Statement | C | Codeforces Beta Round 26 (Codeforces format) {26} | PROGRAMMING | Разбор Codeforces Beta Round #26 (ещё один) | 2200 | |
| 928 | Tickets | combinatorics math probabilities | Statement | D | Codeforces Beta Round 26 (Codeforces format) {26} | PROGRAMMING | Разбор Codeforces Beta Round #26 (ещё один) | 2800 | |
| 1271 | Bath Queue | combinatorics dp probabilities | Statement | C | Codeforces Beta Round 28 (Codeforces format) {28} | PROGRAMMING | Codeforces Beta Round #28 (Разбор задач A и B) | 2700 | |
| 513 | Lesson Timetable | combinatorics dp math | Statement | D | Codeforces Beta Round 37 {37} | PROGRAMMING | Codeforces Beta Round #37 (Tutorial) | 2300 | |
| 809 | Number Table | combinatorics | Statement | E | Codeforces Beta Round 39 {40} | PROGRAMMING | Codeforces Beta Round #39 (Разбор задач) | 2500 | |
| 230 | Toys | brute force combinatorics | Statement | I | School Team Contest 2 (Winter Computer School 2010/11) {44} | PROGRAMMING | School Team Contest #2 (Winter Computer School 2010/2011): tutorial of A-E, H, J. | 2400 | |
| 453 | Pentagon | combinatorics graphs matrices | Statement | E | Codeforces Beta Round 48 {51} | PROGRAMMING | 2300 | ||
| 2400 | Right Triangles | combinatorics | Statement | B | Codeforces Testing Round 1 {52} | PROGRAMMING | 1600 | ||
| 3943 | Array | combinatorics math | Statement | C | Codeforces Beta Round 53 {57} | PROGRAMMING | Codeforces Beta Round #53 [Analysis] | 1900 | |
| 135534 | Ultra-Fast Mathematician | implementation | Statement | A | Codeforces Beta Round 57 (Div. 2) {61} | PROGRAMMING | Round 57-A | 900 | |
| 1008 | Ski Base | combinatorics dsu graphs | Statement | C | Codeforces Beta Round 75 (Div. 1 Only) {91} | PROGRAMMING | Analysis Codeforces Beta Round #75 | 2500 | |
| 4243 | Basketball Team | combinatorics dp math probabilities | Statement | B | Codeforces Beta Round 83 (Div. 1 Only) {107} | PROGRAMMING | Tutorial | 1700 | |
| 900 | Petya and Coloring | combinatorics dp | Statement | D | Codeforces Beta Round 85 (Div. 1 Only) {111} | PROGRAMMING | Codeforces Beta Round #85: Разбор задач | 2300 | |
| 142 | Sleeping | combinatorics implementation math | Statement | E | Codeforces Beta Round 86 (Div. 1 Only) {113} | PROGRAMMING | Codeforces Beta Round #86 Editorial | 2600 | |
| 1432 | Lucky Permutation | brute force combinatorics number theory | Statement | C | Codeforces Beta Round 91 (Div. 1 Only) {121} | PROGRAMMING | Разбор задач | 2000 | |
| 720 | Brackets | combinatorics dp greedy | Statement | C | Codeforces Beta Round 92 (Div. 1 Only) {123} | PROGRAMMING | Codeforces Beta Round #92 - Analysis | 2300 | |
| 4844 | Permutations | brute force combinatorics implementation | Statement | B | Codeforces Beta Round 92 (Div. 2 Only) {124} | PROGRAMMING | Codeforces Beta Round #92 - Analysis | 1400 | |
| 3238 | Games with Rectangle | combinatorics dp | Statement | C | Codeforces Beta Round 94 (Div. 1 Only) {128} | PROGRAMMING | 3219 | 2100 | |
| 12538 | The World is a Theatre | combinatorics math | Statement | C | Codeforces Beta Round 95 (Div. 2) {131} | PROGRAMMING | Разбор Codeforces Beta Round #95 (Div.2) | 1500 | |
| 356 | Weak Subsequence | combinatorics | Statement | E | Codeforces Beta Round 97 (Div. 1) {135} | PROGRAMMING | Codeforces Beta Round #97: editorial | 2800 | |
| 1035 | New Year Garland | combinatorics dp | Statement | E | Codeforces Round 100 {140} | PROGRAMMING | Codeforces Round #100: problem analysis | 2600 | |
| 2144 | Lucky Subsequence | combinatorics dp math | Statement | C | Codeforces Round 104 (Div. 1) {145} | PROGRAMMING | Codeforces Round #104 - Editorial | 2200 | |
| 269 | Lucky Pair | combinatorics data structures implementation | Statement | D | Codeforces Round 104 (Div. 1) {145} | PROGRAMMING | Codeforces Round #104 - Editorial | 2800 | |
| 5292 | Quantity of Strings | combinatorics dfs and similar graphs math | Statement | B | Codeforces Round 107 (Div. 1) {150} | PROGRAMMING | Tutorial | 1800 | |
| 11616 | Pocket Book | combinatorics | Statement | C | Codeforces Round 108 (Div. 2) {152} | PROGRAMMING | Разбор задач Codeforces Round #108 (Div. 2) | 1500 | |
| 2619 | Cipher | combinatorics dp | Statement | C | Codeforces Round 110 (Div. 1) {156} | PROGRAMMING | Codeforces Round 110 — Разбор задач | 2100 | |
| 2026 | Clues | combinatorics graphs | Statement | D | Codeforces Round 110 (Div. 1) {156} | PROGRAMMING | Codeforces Round 110 — Разбор задач | 2400 | |
| 4743 | Star | *special combinatorics | Statement | B | April Fools Day Contest {171} | PROGRAMMING | April Fools Day Contest: editorial | 1300 | |
| 528 | Playing with Superglue | combinatorics constructive algorithms | Statement | C | Croc Champ 2012 - Round 2 {176} | PROGRAMMING | Croc Champ 2012 — Round 2 — Editorial | 2000 | |
| 483 | Thoroughly Bureaucratic Organization | binary search combinatorics | Statement | E | Codeforces Round 127 (Div. 1) {201} | PROGRAMMING | 2600 | ||
| 6572 | Little Elephant and Interval | binary search combinatorics dp | Statement | A | Codeforces Round 129 (Div. 1) {204} | PROGRAMMING | Tutorial | 1600 | |
| 483 | Cowboys | combinatorics dp math | Statement | C | VK Cup 2012 Finals (unofficial online-version) {212} | PROGRAMMING | 2200 | ||
| 1977 | Numbers | combinatorics dp | Statement | B | Codeforces Round 131 (Div. 1) {213} | PROGRAMMING | Codeforces Round #131 Tutorial | 2200 | |
| 671 | Periodical Numbers | combinatorics dp number theory | Statement | E | Codeforces Round 132 (Div. 2) {215} | PROGRAMMING | Codeforces Round #132 (Div. 2) Tutorial | 2600 | |
| 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 | |
| 1750 | Partial Sums | combinatorics math number theory | Statement | C | Codeforces Round 138 (Div. 1) {223} | PROGRAMMING | Tutorial | 2200 | |
| 1778 | Triangles | combinatorics graphs math | Statement | C | Codeforces Round 142 (Div. 1) {229} | PROGRAMMING | Codeforces Round #142 Problem Analysis | 2100 | |
| 524 | Gifts | combinatorics dp math probabilities | Statement | E | Codeforces Round 142 (Div. 1) {229} | PROGRAMMING | Codeforces Round #142 Problem Analysis | 2500 | |
| 1651 | Table | bitmasks combinatorics dp math | Statement | B | Codeforces Round 144 (Div. 1) {232} | PROGRAMMING | Editorial for Codeforces Round #144 | 2200 | |
| 884 | Number Challenge | combinatorics dp implementation math number theory | Statement | E | Codeforces Round 146 (Div. 1) {235} | PROGRAMMING | Codeforces Round #146 Tutorial | 2600 | |
| 21079 | Points on Line | binary search combinatorics two pointers | Statement | A | Codeforces Round 153 (Div. 1) {251} | PROGRAMMING | Editorial of Codeforces Round #153 | 1400 | |
| 1599 | Little Elephant and Elections | brute force combinatorics dp | Statement | B | Codeforces Round 157 (Div. 1) {258} | PROGRAMMING | Codeforces Round #157 — Editorial | 2100 | |
| 1951 | Little Elephant and LCM | binary search combinatorics dp math | Statement | C | Codeforces Round 157 (Div. 1) {258} | PROGRAMMING | Codeforces Round #157 — Editorial | 2400 | |
| 2828 | Dima and Two Sequences | combinatorics math sortings | Statement | D | Codeforces Round 167 (Div. 2) {272} | PROGRAMMING | Codeforces Round #167 tutorial | 1800 | |
| 1294 | Dima and Horses | combinatorics constructive algorithms graphs | Statement | E | Codeforces Round 167 (Div. 2) {272} | PROGRAMMING | Codeforces Round #167 tutorial | 2300 | |
| 853 | Cow Tennis Tournament | combinatorics data structures math | Statement | E | Codeforces Round 174 (Div. 1) {283} | PROGRAMMING | Math Problems on Codeforces #174 | 2700 | |
| 1671 | Permutation Sum | bitmasks combinatorics dp implementation meet-in-the-middle | Statement | D | Codeforces Round 175 (Div. 2) {285} | PROGRAMMING | Codeforces Round #175 (Div. 2) Tutorial | 1900 | |
| 1290 | Positions in Permutations | combinatorics dp math | Statement | E | Codeforces Round 175 (Div. 2) {285} | PROGRAMMING | Codeforces Round #175 (Div. 2) Tutorial | 2600 | |
| 3203 | Polo the Penguin and Houses | combinatorics | Statement | B | Codeforces Round 177 (Div. 1) {288} | PROGRAMMING | Tutorial | 1700 | |
| 837 | Polo the Penguin and Trees | combinatorics dfs and similar trees | Statement | D | Codeforces Round 177 (Div. 1) {288} | PROGRAMMING | Codeforces Round #177, editorial | 2300 | |
| 940 | Distinct Paths | brute force combinatorics | Statement | B | Croc Champ 2013 - Round 2 {293} | PROGRAMMING | Croc Champ 2013 — Round 2 — Editorial | 2600 | |
| 4312 | Shaass and Lights | combinatorics number theory | Statement | C | Codeforces Round 178 (Div. 2) {294} | PROGRAMMING | Codeforces Round #178 Editorial | 1900 | |
| 738 | Greg and Caves | combinatorics dp | Statement | D | Codeforces Round 179 (Div. 1) {295} | PROGRAMMING | Codeforces Round #179 tutorial | 2400 | |
| 1933 | Greg and Friends | combinatorics dp graphs shortest paths | Statement | C | Codeforces Round 179 (Div. 1) {295} | PROGRAMMING | Codeforces Round #179 tutorial | 2500 | |
| 2667 | Yaroslav and Two Strings | combinatorics dp | Statement | B | Codeforces Round 179 (Div. 2) {296} | PROGRAMMING | Codeforces Round #179 tutorial | 2000 | |
| 11600 | Beautiful Numbers | brute force combinatorics | Statement | C | Codeforces Round 181 (Div. 2) {300} | PROGRAMMING | English Tutorial | 1800 | |
| 555 | Olya and Graph | combinatorics math | Statement | D | Codeforces Round 184 (Div. 2) {305} | PROGRAMMING | 7712 | 2600 | |
| 619 | White, Black and White Again | combinatorics number theory | Statement | C | Testing Round 6 {306} | PROGRAMMING | 2200 | ||
| 3019 | Malek Dance Club | combinatorics math | Statement | A | Codeforces Round 189 (Div. 1) {319} | PROGRAMMING | Codeforces Round #189 — Editorial | 1700 | |
| 13152 | Ciel and Flowers | combinatorics math | Statement | B | Codeforces Round 190 (Div. 2) {322} | PROGRAMMING | Codeforces Round #190 — Editorial | 1600 | |
| 963 | Black-and-White Cube | combinatorics constructive algorithms | Statement | A | Testing Round 7 {323} | PROGRAMMING | 1600 | ||
| 940 | The Red Button | combinatorics dfs and similar dsu graphs greedy | Statement | E | MemSQL start[c]up Round 1 {325} | PROGRAMMING | Editorial | 2700 | |
| 3659 | Magic Five | combinatorics math | Statement | C | Codeforces Round 191 (Div. 2) {327} | PROGRAMMING | Codeforces Round #191 — Tutorial | 1700 | |
| 1575 | Axis Walking | bitmasks combinatorics constructive algorithms dp meet-in-the-middle | Statement | E | Codeforces Round 191 (Div. 2) {327} | PROGRAMMING | Codeforces Round #191 — Tutorial | 2500 | |
| 1212 | Vasily the Bear and Beautiful Strings | combinatorics math number theory | Statement | D | Codeforces Round 195 (Div. 2) {336} | PROGRAMMING | Tutorial Codeforces Round #195 (Div. 2) | 2400 | |
| 126 | Vasily the Bear and Painting Square | bitmasks combinatorics dp implementation | Statement | E | Codeforces Round 195 (Div. 2) {336} | PROGRAMMING | Tutorial Codeforces Round #195 (Div. 2) | 2600 | |
| 4668 | Tourist Problem | combinatorics implementation math | Statement | C | Codeforces Round 198 (Div. 2) {340} | PROGRAMMING | Tutorial | 1700 | |
| 2742 | Iahub and Permutations | combinatorics math | Statement | E | Codeforces Round 198 (Div. 2) {340} | PROGRAMMING | Tutorial | 2200 | |
| 2721 | Jeff and Furik | combinatorics dp probabilities | Statement | B | Codeforces Round 204 (Div. 1) {351} | PROGRAMMING | Codeforces Round #204 — tutorial | 2100 | |
| 2430 | Two Heaps | combinatorics constructive algorithms greedy implementation math sortings | Statement | B | Codeforces Round 205 (Div. 2) {353} | PROGRAMMING | 9145 | 1800 | |
| 1395 | Compartments | combinatorics constructive algorithms greedy implementation | Statement | C | Codeforces Round 207 (Div. 1) {356} | PROGRAMMING | Codeforces Round #207: разбор задач | 2200 | |
| 1212 | Levko and Strings | combinatorics dp | Statement | C | Codeforces Round 210 (Div. 1) {360} | PROGRAMMING | Codeforces Round #210 editorial | 2700 | |
| 4948 | Matrix | combinatorics data structures implementation | Statement | A | Codeforces Round 213 (Div. 1) {364} | PROGRAMMING | Codeforces Round #213 Editorial | 1800 | |
| 1387 | Sereja and Intervals | combinatorics dp | Statement | E | Codeforces Round 215 (Div. 1) {367} | PROGRAMMING | Codeforces Round #215 — tutorial | 2600 | |
| 189 | Drawing Circles is Fun | combinatorics geometry | Statement | E | Codeforces Round 219 (Div. 1) {372} | PROGRAMMING | 9944 | 2900 | |
| 3485 | Inna and Nine | combinatorics greedy | Statement | B | Codeforces Round 220 (Div. 2) {374} | PROGRAMMING | Codeforces Round #220 (Div. 2) разбор | 1600 | |
| 521 | Sereja and Cinema | combinatorics math | Statement | D | Codeforces Round 223 (Div. 1) {380} | PROGRAMMING | Codeforces Round #223 — Tutorial | 2500 | |
| 430 | Ksenia and Combinatorics | combinatorics dp | Statement | E | Codeforces Round 224 (Div. 2) {382} | PROGRAMMING | Codeforces Round #224 (Div. 2) Editorial | 2600 | |
| 4281 | Vowels | combinatorics divide and conquer dp | Statement | E | Codeforces Round 225 (Div. 1) {383} | PROGRAMMING | Tutorial | 2700 | |
| 664 | Yet Another Number Sequence | combinatorics math matrices | Statement | C | Codeforces Round 230 (Div. 1) {392} | PROGRAMMING | 1500.0 | 83942 | |
| 464 | On Sum of Number of Inversions in Permutations | combinatorics math | Statement | D | Codeforces Round 232 (Div. 1) {396} | PROGRAMMING | 2000.0 | Codeforces Round #232 Editorial (restored) | |
| 1626 | On Number of Decompositions into Multipliers | combinatorics math number theory | Statement | A | Codeforces Round 232 (Div. 1) {396} | PROGRAMMING | 500.0 | Codeforces Round #232 Editorial (restored) | |
| 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 | |
| 1231 | Beautiful Pairs of Numbers | combinatorics dp | Statement | D | Codeforces Round 236 (Div. 1) {403} | PROGRAMMING | Editorial Codeforces Round #236 | 2200 | |
| 1189 | Curious Array | brute force combinatorics implementation math | Statement | C | Codeforces Round 239 (Div. 1) {407} | PROGRAMMING | Codeforces Round #239 Editorial | 2500 | |
| 29009 | Mashmokh and ACM | combinatorics dp number theory | Statement | B | Codeforces Round 240 (Div. 1) {414} | PROGRAMMING | Codeforces Round #240 Editorial | 1500 | |
| 2355 | Mashmokh and Reverse Operation | combinatorics divide and conquer | Statement | C | Codeforces Round 240 (Div. 1) {414} | PROGRAMMING | Codeforces Round #240 Editorial | 2400 | |
| 2871 | Random Task | binary search bitmasks combinatorics dp math | Statement | D | Codeforces Round 247 (Div. 2) {431} | PROGRAMMING | Editorial Codeforces Round #247 (Div. 2) | 2200 | |
| 2126 | The Child and Binary Tree | combinatorics divide and conquer fft number theory | Statement | E | Codeforces Round 250 (Div. 1) {438} | PROGRAMMING | Tutorial | 3100 | |
| 1835 | Devu and Birthday Celebration | combinatorics dp math | Statement | E | Codeforces Round 251 (Div. 2) {439} | PROGRAMMING | Codeforces Round #251 Editorial | 2600 | |
| 6101 | Jzzhu and Numbers | bitmasks combinatorics dp | Statement | D | Codeforces Round 257 (Div. 1) {449} | PROGRAMMING | Codeforces Round #257 Editorial | 2400 | |
| 4495 | Devu and Flowers | bitmasks combinatorics number theory | Statement | E | Codeforces Round 258 (Div. 2) {451} | PROGRAMMING | Codeforces Round #258 Editorial | 2400 | |
| 1748 | 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 | |
| 388 | 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 | |
| 47322 | Pashmak and Flowers | combinatorics implementation sortings | Statement | B | Codeforces Round 261 (Div. 2) {459} | PROGRAMMING | Codeforces Round #261 Editorial | 1300 | |
| 6480 | Pashmak and Buses | combinatorics constructive algorithms math | Statement | C | Codeforces Round 261 (Div. 2) {459} | PROGRAMMING | Codeforces Round #261 Editorial | 1900 | |
| 3744 | Increase Sequence | combinatorics dp | Statement | D | Codeforces Round 266 (Div. 2) {466} | PROGRAMMING | Editorial Codeforces Round #266 (Div. 2) | 2300 | |
| 36817 | Dreamoon and WiFi | bitmasks brute force combinatorics dp math probabilities | Statement | B | Codeforces Round 272 (Div. 2) {476} | PROGRAMMING | 1300 | ||
| 41118 | Random Teams | combinatorics constructive algorithms greedy math | Statement | B | Codeforces Round 273 (Div. 2) {478} | PROGRAMMING | Editorial | 1300 | |
| 5604 | Riding in a Lift | combinatorics dp | Statement | E | Codeforces Round 274 (Div. 2) {479} | PROGRAMMING | Codeforces Round #274: editorial | 2000 | |
| 590 | Random Function and Tree | combinatorics dp trees | Statement | D | Codeforces Round 275 (Div. 1) {482} | PROGRAMMING | Codeforces Round #275 Editorial | 2600 | |
| 7036 | Unbearable Controversy of Being | brute force combinatorics dfs and similar graphs | Statement | D | Codeforces Round 277.5 (Div. 2) {489} | PROGRAMMING | Codeforces Round #277.5 (Div. 2) Editorial [A-D for now] | 1700 | |
| 1937 | Special Matrices | combinatorics dp | Statement | F | Codeforces Round 277.5 (Div. 2) {489} | PROGRAMMING | Codeforces Round #277.5 (Div. 2) Editorial [A-D for now] | 2200 | |
| 3274 | New Year Santa Network | combinatorics dfs and similar graphs trees | Statement | D | Good Bye 2014 {500} | PROGRAMMING | Tutorial 2 | 1900 | |
| 951 | Misha and Palindrome Degree | binary search combinatorics implementation | Statement | E | Codeforces Round 285 (Div. 2) {501} | PROGRAMMING | Tutorial | 2800 | |
| 916 | Mr. Kitayuta's Gift | combinatorics dp matrices strings | Statement | E | Codeforces Round 286 (Div. 1) {506} | PROGRAMMING | Editorial | 2900 | |
| 8129 | Ilya and Escalator | combinatorics dp math probabilities | Statement | D | Codeforces Round 293 (Div. 2) {518} | PROGRAMMING | Codeforces Round #293 (Div.2) Editorial | 1900 | |
| 417 | Pasha and Pipe | binary search brute force combinatorics dp implementation | Statement | F | Codeforces Round 293 (Div. 2) {518} | PROGRAMMING | Codeforces Round #293 (Div.2) Editorial | 2800 | |
| 2083 | Pluses everywhere | combinatorics dp math number theory | Statement | E | Codeforces Round 295 (Div. 2) {520} | PROGRAMMING | Codeforces Round #295 Editorial (now with bonuses!) | 2500 | |
| 25713 | Tavas and SaDDas | bitmasks brute force combinatorics implementation | Statement | B | Codeforces Round 299 (Div. 2) {535} | PROGRAMMING | Codeforces Round #299 Editorial | 1100 | |
| 3383 | Mike and Foam | bitmasks combinatorics dp math number theory | Statement | C | Codeforces Round 305 (Div. 1) {547} | PROGRAMMING | Codeforces Round #305 Editorial | 2700 | |
| 2097 | GukiZ and Binary Operations | combinatorics implementation math matrices number theory | Statement | D | Codeforces Round 307 (Div. 2) {551} | PROGRAMMING | Tutorial | 2400 | |
| 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 | |
| 9790 | Kyoya and Colored Balls | combinatorics dp math | Statement | A | Codeforces Round 309 (Div. 1) {553} | PROGRAMMING | Codeforces Round #309 Editorial | 1700 | |
| 2263 | Kyoya and Permutation | binary search combinatorics constructive algorithms greedy implementation math | Statement | B | Codeforces Round 309 (Div. 1) {553} | PROGRAMMING | Codeforces Round #309 Editorial | 2200 | |
| 2373 | Vitaly and Cycle | combinatorics dfs and similar graphs math | Statement | D | Codeforces Round 311 (Div. 2) {557} | PROGRAMMING | Codeforces Round #311 (Div.2) Editorial | 2300 | |
| 8026 | Gerald and Giant Chess | combinatorics dp math number theory | Statement | C | Codeforces Round 313 (Div. 1) {559} | PROGRAMMING | Codeforces Round 313 — Extended editoral | 2500 | |
| 475 | Randomizer | combinatorics geometry probabilities | Statement | D | Codeforces Round 313 (Div. 1) {559} | PROGRAMMING | Codeforces Round 313 — Extended editoral | 2800 | |
| 2382 | Symmetric and Transitive | combinatorics dp math | Statement | B | Codeforces Round 315 (Div. 1) {568} | PROGRAMMING | Codeforces Round #315 Editorial | 2100 | |
| 2102 | Pig and Palindromes | combinatorics dp | Statement | E | Codeforces Round 316 (Div. 2) {570} | PROGRAMMING | Codeforces Round #316 Editorial | 2600 | |
| 2676 | Lengthening Sticks | combinatorics implementation math | Statement | A | Codeforces Round 317 [AimFund Thanks-Round] (Div. 1) {571} | PROGRAMMING | Codeforces Round #317 [AimFund Thanks-Round] Editorial | 2300 | |
| 1876 | Bots | combinatorics number theory | Statement | H | Bubble Cup 8 - Finals [Online Mirror] {575} | PROGRAMMING | Bubble Cup finals 2015 Results and Editorial | 1800 | |
| 14756 | Modulo Sum | combinatorics data structures dp two pointers | Statement | B | Codeforces Round 319 (Div. 2) {577} | PROGRAMMING | Editorial Codeforces Round #319 | 1800 | |
| 13638 | Kolya and Tanya | combinatorics | Statement | B | Codeforces Round 324 (Div. 2) {584} | PROGRAMMING | Tutorial | 1500 | |
| 1220 | Present for Vitalik the Philatelist | combinatorics math number theory | Statement | E | Codeforces Round 325 (Div. 1) {585} | PROGRAMMING | Разбор Codeforces Round #325 | 2800 | |
| 2330 | Wilbur and Points | combinatorics greedy sortings | Statement | C | Codeforces Round 331 (Div. 2) {596} | PROGRAMMING | Codeforces Round #331 Editorial | 1700 | |
| 2708 | Moodular Arithmetic | combinatorics dfs and similar dsu math number theory | Statement | B | Codeforces Round 334 (Div. 1) {603} | PROGRAMMING | Codeforces Round #334 Editorial | 2000 | |
| 7449 | Hamming Distance Sum | combinatorics strings | Statement | B | Codeforces Round 336 (Div. 2) {608} | PROGRAMMING | Codeforces Round #336 Editorial | 1500 | |
| 27497 | Pasha and Stick | combinatorics math | Statement | A | Codeforces Round 337 (Div. 2) {610} | PROGRAMMING | Codeforces Round #337 (Div.2) Editorial | 1000 | |
| 1998 | Square Root of Permutation | combinatorics constructive algorithms dfs and similar graphs math | Statement | E | Educational Codeforces Round 4 {612} | PROGRAMMING | 22299 | 2200 | |
| 19959 | Chocolate | combinatorics | Statement | B | Codeforces Round 340 (Div. 2) {617} | PROGRAMMING | Tutorial | 1300 | |
| 11599 | Wet Shark and Bishops | combinatorics implementation | Statement | B | Codeforces Round 341 (Div. 2) {621} | PROGRAMMING | Editorial | 1300 | |
| 6218 | Wet Shark and Flowers | combinatorics math number theory probabilities | Statement | C | Codeforces Round 341 (Div. 2) {621} | PROGRAMMING | 1700 | ||
| 611 | Transforming Sequence | combinatorics dp fft math | Statement | E | AIM Tech Round (Div. 1) {623} | PROGRAMMING | AIM Tech Round Tutorial | 3300 | |
| 3146 | Jerry's Protest | brute force combinatorics dp probabilities | Statement | D | 8VC Venture Cup 2016 - Elimination Round {626} | PROGRAMMING | 23522 | 1800 | |
| 1148 | Famil Door and Roads | combinatorics data structures dfs and similar dp probabilities trees | Statement | E | Codeforces Round 343 (Div. 2) {629} | PROGRAMMING | Editorial of Codeforces Round #343 (Div.2) | 2400 | |
| 14829 | Far Relative’s Birthday Cake | brute force combinatorics constructive algorithms implementation | Statement | A | Codeforces Round 343 (Div. 2) {629} | PROGRAMMING | Editorial of Codeforces Round #343 (Div.2) | 800 | |
| 26806 | Lucky Numbers | combinatorics math | Statement | C | Experimental Educational Round: VolBIT Formulas Blitz {630} | PROGRAMMING | 24160 | 1100 | |
| 8040 | Selection of Personnel | combinatorics math | Statement | F | Experimental Educational Round: VolBIT Formulas Blitz {630} | PROGRAMMING | Разбор задач Experimental Educational Round: VolBIT Formulas Blitz | 1500 | |
| 5655 | Benches | combinatorics math | Statement | H | Experimental Educational Round: VolBIT Formulas Blitz {630} | PROGRAMMING | 24160 | 1700 | |
| 3297 | Challenge Pennants | combinatorics math | Statement | G | Experimental Educational Round: VolBIT Formulas Blitz {630} | PROGRAMMING | Разбор задач Experimental Educational Round: VolBIT Formulas Blitz | 1800 | |
| 8233 | Parking Lot | combinatorics math | Statement | I | Experimental Educational Round: VolBIT Formulas Blitz {630} | PROGRAMMING | Разбор задач Experimental Educational Round: VolBIT Formulas Blitz | 1900 | |
| 966 | Cowslip Collections | combinatorics math number theory | Statement | F | CROC 2016 - Elimination Round {645} | PROGRAMMING | Editorial for CROC 2016 Elimination Round | 2500 | |
| 3749 | Foe Pairs | combinatorics sortings two pointers | Statement | C | Educational Codeforces Round 10 {652} | PROGRAMMING | Editorial of Educational Codeforces Round 10 | 1800 | |
| 642 | Move by Prime | combinatorics math number theory | Statement | G | IndiaHacks 2016 - Online Edition (Div. 1 + Div. 2) {653} | PROGRAMMING | IndiaHacks Finals 2016 — Editorial | 3000 | |
| 1315 | Fence Divercity | combinatorics dp number theory | Statement | G | Codeforces Round 346 (Div. 2) {659} | PROGRAMMING | Editorial for Codeforces Round #346 (Div. 2) | 2500 | |
| 1954 | Different Subsets For All Tuples | combinatorics | Statement | E | Educational Codeforces Round 11 {660} | PROGRAMMING | Editorial of Educational Codeforces Round 11 | 2300 | |
| 910 | Codeword | combinatorics strings | Statement | C | Codeforces Round 349 (Div. 1) {666} | PROGRAMMING | Codeforces Round #349 Editorial | 2400 | |
| 6942 | Vanya and Label | bitmasks combinatorics implementation strings | Statement | C | Codeforces Round 355 (Div. 2) {677} | PROGRAMMING | Codeforces Round #355 (Div. 2) Editorial | 1500 | |
| 4493 | Robbers' watch | brute force combinatorics dp math | Statement | A | Codeforces Round 359 (Div. 1) {685} | PROGRAMMING | Codeforces Round #359 Editorial | 1700 | |
| 6161 | Mike and Chocolate Thieves | binary search combinatorics math | Statement | C | Codeforces Round 361 (Div. 2) {689} | PROGRAMMING | 45912 | 1700 | |
| 2118 | Mike and Geometry Problem | combinatorics data structures dp geometry implementation | Statement | E | Codeforces Round 361 (Div. 2) {689} | PROGRAMMING | Tutorial | 2300 | |
| 1459 | The Wall (medium) | combinatorics | Statement | D2 | Helvetic Coding Contest 2016 online mirror (teams, unrated) {690} | PROGRAMMING | Tutotial | 1800 | |
| 2212 | PLEASE | combinatorics dp implementation math matrices | Statement | C | Codeforces Round 362 (Div. 1) {696} | PROGRAMMING | Codeforces Round #362 (Editorial) | 2200 | |
| 487 | Coprime Permutation | combinatorics number theory | Statement | F | Codeforces Round 363 (Div. 1) {698} | PROGRAMMING | Solution | 3000 | |
| 4954 | Directed Roads | combinatorics dfs and similar graphs math | Statement | D | Codeforces Round 369 (Div. 2) {711} | PROGRAMMING | 46830 | 1900 | |
| 1991 | Memory and Scores | combinatorics dp math | Statement | D | Codeforces Round 370 (Div. 2) {712} | PROGRAMMING | Codeforces Round #370 Editorial | 2100 | |
| 451 | Complete the Permutations | combinatorics fft graphs math | Statement | E | Codeforces Round 372 (Div. 1) {715} | PROGRAMMING | Codeforces Round #372 Editorial | 3400 | |
| 1078 | Research Rover | combinatorics dp | Statement | E | Intel Code Challenge Elimination Round (Div. 1 + Div. 2, combined) {722} | PROGRAMMING | Tutorial | 2800 | |
| 520 | Uniformly Branched Trees | combinatorics dp trees | Statement | F | Intel Code Challenge Final Round (Div. 1 + Div. 2, Combined) {724} | PROGRAMMING | Tutorial | 2800 | |
| 7958 | Tennis Championship | combinatorics constructive algorithms greedy math | Statement | C | Codeforces Round 382 (Div. 2) {735} | PROGRAMMING | Codeforces Round #382 Editorial | 1700 | |
| 541 | Permutations | math matrices | Statement | D | Codeforces Round 382 (Div. 1) {736} | PROGRAMMING | 48659 | 2700 | |
| 481 | Igor and Interesting Numbers | brute force combinatorics dp math | Statement | F | Codeforces Round 387 (Div. 2) {747} | PROGRAMMING | 49171 | 2600 | |
| 525 | New Year and Binary Tree Paths | bitmasks brute force combinatorics dp | Statement | G | Good Bye 2016 {750} | PROGRAMMING | Good Bye 2016 — hints and codes | 3100 | |
| 1022 | PolandBall and Many Other Balls | combinatorics divide and conquer dp fft math number theory | Statement | G | 8VC Venture Cup 2017 - Elimination Round {755} | PROGRAMMING | 8VC Venture Cup 2017 — Elimination Round [Editorial] | 3100 | |
| 1081 | Bacterial Melee | brute force combinatorics dp string suffix structures | Statement | D | 8VC Venture Cup 2017 - Final Round {756} | PROGRAMMING | 8VC Venture Cup 2017 — Final Round and Codeforces Round #393 Editorial | 2500 | |
| 205 | Byteland coins | combinatorics dp math | Statement | E | 8VC Venture Cup 2017 - Final Round {756} | PROGRAMMING | 8VC Venture Cup 2017 — Final Round and Codeforces Round #393 Editorial | 3200 | |
| 1543 | Bash Plays with Functions | brute force combinatorics dp number theory | Statement | E | Codecraft-17 and Codeforces Round 391 (Div. 1 + Div. 2, combined) {757} | PROGRAMMING | CodeCraft-17 and Codeforces Round #391 (Div. 1 + Div. 2, combined) Editorial | 2400 | |
| 478 | Tree nesting | combinatorics graphs trees | Statement | F | Educational Codeforces Round 17 {762} | PROGRAMMING | Tutorial | 2900 | |
| 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 | |
| 218 | Test Data Generation | combinatorics divide and conquer dp fft math number theory | Statement | F | VK Cup 2017 - Round 3 {773} | PROGRAMMING | VK Cup 2017 Round 3 + Codeforces Round #412 -- Tutorial | 3400 | |
| 367 | Sherlock and the Encrypted Data | bitmasks combinatorics dp | Statement | G | 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 | 2800 | |
| 3656 | Anton and School - 2 | combinatorics dp math number theory | Statement | D | Codeforces Round 404 (Div. 2) {785} | PROGRAMMING | Editorial | 2200 | |
| 2882 | Weird journey | combinatorics constructive algorithms dfs and similar dsu graphs | Statement | B | Codeforces Round 407 (Div. 1) {788} | PROGRAMMING | Codeforces Round #407(Div.1 + Div.2) Editorial | 2200 | |
| 401 | Replace All | combinatorics dp math | Statement | G | Tinkoff Challenge - Final Round (Codeforces Round 414, rated, Div. 1 + Div. 2) {794} | PROGRAMMING | 3400 | ||
| 4600 | Coprime Subsequences | bitmasks combinatorics number theory | Statement | F | Educational Codeforces Round 20 {803} | PROGRAMMING | 51768 | 2100 | |
| 10151 | Minimum number of steps | combinatorics greedy implementation math | Statement | B | Codeforces Round 411 (Div. 1) {804} | PROGRAMMING | Codeforces Round #411 Editorial | 1400 | |
| 215 | Fake bullions | combinatorics dfs and similar dp graphs number theory | Statement | F | Codeforces Round 411 (Div. 1) {804} | PROGRAMMING | Codeforces Round #411 Editorial | 3400 | |
| 905 | Find a car | combinatorics divide and conquer dp | Statement | C | Codeforces Round 415 (Div. 1) {809} | PROGRAMMING | 52099 | 2900 | |
| 725 | An unavoidable detour for home | combinatorics dp graphs shortest paths | Statement | E | Codeforces Round 418 (Div. 2) {814} | PROGRAMMING | Codeforces Round #418 (Div. 2) Editorial | 2700 | |
| 1600 | Karen and Test | brute force combinatorics constructive algorithms math | Statement | B | Codeforces Round 419 (Div. 1) {815} | PROGRAMMING | Codeforces Round #419 Editorial | 2200 | |
| 749 | Karen and Cards | binary search combinatorics data structures geometry | Statement | D | Codeforces Round 419 (Div. 1) {815} | PROGRAMMING | Codeforces Round #419 Editorial | 2700 | |
| 6420 | Makes And The Product | combinatorics implementation math sortings | Statement | B | Educational Codeforces Round 23 {817} | PROGRAMMING | 52638 | 1500 | |
| 977 | Singer House | combinatorics dp graphs trees | Statement | D | Codeforces Round 424 (Div. 1, rated, based on VK Cup Finals) {830} | PROGRAMMING | Codeforces Round #424 Editorial | 2800 | |
| 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 | |
| 3541 | Winter is here | combinatorics dp math number theory | Statement | D | Codeforces Round 428 (Div. 2) {839} | PROGRAMMING | Codeforces Round #428 editorial | 2200 | |
| 7445 | Leha and Function | combinatorics greedy math number theory sortings | Statement | A | Codeforces Round 429 (Div. 1) {840} | PROGRAMMING | Editorial | 1300 | |
| 2064 | On the Bench | combinatorics dp | Statement | C | Codeforces Round 429 (Div. 1) {840} | PROGRAMMING | Editorial | 2600 | |
| 9025 | Rectangles | combinatorics math | Statement | B | AIM Tech Round 4 (Div. 2) {844} | PROGRAMMING | AIM Tech Round 4 -- Editorial | 1300 | |
| 455 | Shake It! | combinatorics dp flows graphs | Statement | D | Codeforces Round 431 (Div. 1) {848} | PROGRAMMING | Codeforces Round #431 Editorial | 2900 | |
| 242 | Days of Floral Colours | combinatorics divide and conquer dp fft math | Statement | E | Codeforces Round 431 (Div. 1) {848} | PROGRAMMING | Codeforces Round #431 Editorial | 3400 | |
| 652 | Product transformation | combinatorics math number theory | Statement | F | Bubble Cup X - Finals [Online Mirror] {852} | PROGRAMMING | Tutorial | 2300 | |
| 721 | Eleventh Birthday | combinatorics dp math | Statement | C | Russian Code Cup 2017 - Finals [Unofficial Mirror, Div. 1 Only Recommended, Teams Allowed] {856} | PROGRAMMING | Tutorial | 2400 | |
| 2111 | Desk Disorder | combinatorics dfs and similar dsu graphs trees | Statement | E | MemSQL Start[c]UP 3.0 - Round 1 {859} | PROGRAMMING | Tutorial | 2100 | |
| 163 | Flowers and Chocolate | combinatorics math matrices | Statement | G | MemSQL Start[c]UP 3.0 - Round 2 (onsite finalists) {865} | PROGRAMMING | MemSQL Start[c]UP 3.0 Round 2 Editorial | 3200 | |
| 5188 | The Intriguing Obsession | combinatorics dp math | Statement | C | Codeforces Round 439 (Div. 2) {869} | PROGRAMMING | Tutorial | 1800 | |
| 2483 | High Cry | binary search bitmasks combinatorics data structures divide and conquer | Statement | D | Codeforces Round 441 (Div. 1, by Moscow Team Olympiad) {875} | PROGRAMMING | Codeforces Round #441. Editorial. | 2200 | |
| 735 | Numbers on the blackboard | combinatorics dp | Statement | E | Codeforces Round 443 (Div. 1) {878} | PROGRAMMING | Editorial | 3200 | |
| 1210 | Maximum Element | combinatorics dp math | Statement | E | Технокубок 2018 - Отборочный Раунд 3 {886} | PROGRAMMING | Editorial Codeforces Round 445 (and Technocup 2018 — Elimination Round 3) | 2500 | |
| 10454 | Almost Identity Permutations | combinatorics dp math | Statement | D | Educational Codeforces Round 32 {888} | PROGRAMMING | Educational Codeforces Round 32 - Editorial | 1600 | |
| 1109 | Lust | combinatorics math matrices | Statement | E | Codeforces Round 446 (Div. 1) {891} | PROGRAMMING | Codeforces Round #446 Editorial | 2800 | |
| 4186 | Counting Arrays | combinatorics dp math number theory | Statement | E | Educational Codeforces Round 33 (Rated for Div. 2) {893} | PROGRAMMING | 55989 | 2000 | |
| 4692 | Ralph And His Magic Field | combinatorics constructive algorithms math number theory | Statement | B | Codeforces Round 447 (Div. 2) {894} | PROGRAMMING | Codeforces Round #447 (Div.2 Only) Editorial | 1800 | |
| 7300 | Square Subsets | bitmasks combinatorics dp math | Statement | C | Codeforces Round 448 (Div. 2) {895} | PROGRAMMING | Codeforces Round #448(Div.2) Editorial | 2000 | |
| 1234 | String Mark | combinatorics math strings | Statement | D | Codeforces Round 448 (Div. 2) {895} | PROGRAMMING | Codeforces Round #448(Div.2) Editorial | 2300 | |
| 609 | Nephren Runs a Cinema | chinese remainder theorem combinatorics math number theory | Statement | D | Codeforces Round 449 (Div. 1) {896} | PROGRAMMING | Codeforces Round #449 Editorial | 2800 | |
| 3771 | Unusual Sequences | bitmasks combinatorics dp math number theory | Statement | D | Codeforces Round 450 (Div. 2) {900} | PROGRAMMING | Codeforces Round #450(Div. 2). Editorial. | 2100 | |
| 836 | New Year and Entity Enumeration | bitmasks combinatorics dp math | Statement | E | Good Bye 2017 {908} | PROGRAMMING | Good Bye 2017 Editorial | 2400 | |
| 4201 | Travelling Salesman and Special Numbers | brute force combinatorics dp | Statement | C | Codecraft-18 and Codeforces Round 458 (Div. 1 + Div. 2, combined) {914} | PROGRAMMING | Tutorial | 1800 | |
| 277 | Ember and Storm's Tree Game | combinatorics dp games trees | Statement | H | Codecraft-18 and Codeforces Round 458 (Div. 1 + Div. 2, combined) {914} | PROGRAMMING | Tutorial | 2900 | |
| 449 | Pollywog | combinatorics dp matrices | Statement | C | Codeforces Round 459 (Div. 1) {917} | PROGRAMMING | Codeforces Round #459 Editorial | 2800 | |
| 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 | |
| 1203 | Красивая команда | *special combinatorics math | Statement | C | VK Cup 2018 - Квалификация 2 {929} | PROGRAMMING | Разбор VK Cup 2018 — Квалификация 2 | 2000 | |
| 3422 | Team Work | combinatorics dp math | Statement | E | ICM Technex 2018 and Codeforces Round 463 (Div. 1 + Div. 2, combined) {932} | PROGRAMMING | 57796 | 2400 | |
| 388 | A Creative Cutout | brute force combinatorics math | Statement | D | Codeforces Round 462 (Div. 1) {933} | PROGRAMMING | 57763 | 2900 | |
| 1536 | Max History | combinatorics math | Statement | E | Educational Codeforces Round 38 (Rated for Div. 2) {938} | PROGRAMMING | Educational Codeforces Round 38 — Editorial | 2300 | |
| 640 | Fibonacci String Subsequences | combinatorics dp matrices | Statement | F | Educational Codeforces Round 39 (Rated for Div. 2) {946} | PROGRAMMING | 58210 | 2500 | |
| 761 | Path Counting | combinatorics dp | Statement | H | Educational Codeforces Round 40 (Rated for Div. 2) {954} | PROGRAMMING | 58519 | 2500 | |
| 2264 | Alternating Tree | combinatorics dfs and similar divide and conquer dp probabilities trees | Statement | E | Divide by Zero 2018 and Codeforces Round 474 (Div. 1 + Div. 2, combined) {960} | PROGRAMMING | Divide by Zero 2018 and Codeforces Round #474 (Div. 1 + Div. 2, combined) Editorial | 2200 | |
| 1201 | Bandit Blues | combinatorics dp fft math | Statement | G | Divide by Zero 2018 and Codeforces Round 474 (Div. 1 + Div. 2, combined) {960} | PROGRAMMING | Divide by Zero 2018 and Codeforces Round #474 (Div. 1 + Div. 2, combined) Editorial | 2800 | |
| 1593 | Partitions | combinatorics math number theory | Statement | G | Educational Codeforces Round 41 (Rated for Div. 2) {961} | PROGRAMMING | Educational Codeforces Round 41 Editorial | 2700 | |
| 10557 | Bus Video System | combinatorics math | Statement | E | Codeforces Round 481 (Div. 3) {978} | PROGRAMMING | T | 1400 | |
| 288 | K Paths | combinatorics data structures dp fft math | Statement | H | Avito Code Challenge 2018 {981} | PROGRAMMING | Avito Code Challenge 2018 — разбор | 2900 | |
| 714 | Team Players | combinatorics | Statement | G | Educational Codeforces Round 44 (Rated for Div. 2) {985} | PROGRAMMING | Educational Codeforces Round 44 Editorial | 2700 | |
| 5042 | Petr and Permutations | combinatorics math | Statement | B | Codeforces Round 485 (Div. 1) {986} | PROGRAMMING | Codeforces Round #485 Editorial | 1800 | |
| 3724 | Bus Number | brute force combinatorics math | Statement | E | Codeforces Round 491 (Div. 2) {991} | PROGRAMMING | 60181 | 1800 | |
| 1603 | Cowmpany Cowmpensation | combinatorics dp math trees | Statement | F | Codeforces Round 492 (Div. 1) [Thanks, uDebug!] {995} | PROGRAMMING | Editorial for Codeforces Round #492 [Thanks u-Debug!] | 2700 | |
| 3135 | Roman Digits | brute force combinatorics dp greedy math | Statement | B | Codeforces Round 493 (Div. 1) {997} | PROGRAMMING | 60357 | 2000 | |
| 2170 | Sky Full of Stars | combinatorics math | Statement | C | Codeforces Round 493 (Div. 1) {997} | PROGRAMMING | 60357 | 2600 | |
| 514 | Cycles in product | combinatorics divide and conquer trees | Statement | D | Codeforces Round 493 (Div. 1) {997} | PROGRAMMING | 60357 | 2800 | |
| 5028 | Yet Another Problem On a Subsequence | combinatorics dp | Statement | D | Educational Codeforces Round 46 (Rated for Div. 2) {1000} | PROGRAMMING | 60288 | 1900 | |
| 13039 | Reorder the Array | combinatorics data structures math sortings two pointers | Statement | A | Codeforces Round 497 (Div. 1) {1007} | PROGRAMMING | Editorial for Codeforces Round #497 by Skyglow | 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 | |
| 3317 | Intercity Travelling | combinatorics math probabilities | Statement | E | Educational Codeforces Round 47 (Rated for Div. 2) {1009} | PROGRAMMING | 60630 | 1900 | |
| 2360 | Inverse Coloring | combinatorics dp math | Statement | E | Educational Codeforces Round 49 (Rated for Div. 2) {1027} | PROGRAMMING | Educational Codeforces Round 49 Editorial | 2100 | |
| 1821 | Order book | combinatorics data structures greedy | Statement | D | AIM Tech Round 5 (rated, Div. 1 + Div. 2) {1028} | PROGRAMMING | 61493 | 2100 | |
| 992 | Region Separation | combinatorics dp number theory trees | Statement | C | Codeforces Round 511 (Div. 1) {1034} | PROGRAMMING | Codeforces Round #511 Editorial | 2900 | |
| 13225 | Classy Numbers | combinatorics dp | Statement | C | Educational Codeforces Round 50 (Rated for Div. 2) {1036} | PROGRAMMING | 61727 | 1800 | |
| 1851 | Relatively Prime Powers | combinatorics math number theory | Statement | F | Educational Codeforces Round 50 (Rated for Div. 2) {1036} | PROGRAMMING | 61727 | 2400 | |
| 1268 | Maximum Reduction | combinatorics data structures math | Statement | F | Manthan, Codefest 18 (rated, Div. 1 + Div. 2) {1037} | 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 | |
| 2981 | Make It One | bitmasks combinatorics dp math number theory shortest paths | Statement | F | Codeforces Round 519 by Botan Investments {1043} | PROGRAMMING | Codeforces Round #519 Editorial | 2500 | |
| 787 | Shrinking Tree | combinatorics dp | Statement | F | Codeforces Round 513 by Barcelona Bootcamp (rated, Div. 1 + Div. 2) {1060} | PROGRAMMING | User editorial for Codeforces Round 513 by Barcelona Bootcamp (rated, Div. 1 + Div. 2) | 2800 | |
| 1278 | Side Transmutations | combinatorics strings | Statement | E | Educational Codeforces Round 52 (Rated for Div. 2) {1065} | PROGRAMMING | Educational Codeforces Round 52 Editorial | 2200 | |
| 3540 | Segment Sum | bitmasks combinatorics dp math | Statement | E | Educational Codeforces Round 53 (Rated for Div. 2) {1073} | PROGRAMMING | 62742 | 2300 | |
| 8419 | Colorful Bricks | combinatorics dp math | Statement | C | Avito Cool Challenge 2018 {1081} | PROGRAMMING | 63888 | 1600 | |
| 11559 | The Fair Nut and String | combinatorics dp implementation | Statement | C | Codeforces Round 526 (Div. 2) {1084} | PROGRAMMING | 63753 | 1500 |