Review the problem statement from Codeforces (link will open a new tab). When you've matched your problem, go to the solutions.
Search on plain tags, ratings, names, and problem text. Example: brute force or binary search
Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 671 | Periodical Numbers | combinatorics dp number theory | Statement | E | Codeforces Round 132 (Div. 2) {215} | PROGRAMMING | Codeforces Round #132 (Div. 2) Tutorial | 2600 | |
| 524 | Gifts | combinatorics dp math probabilities | Statement | E | Codeforces Round 142 (Div. 1) {229} | PROGRAMMING | Codeforces Round #142 Problem Analysis | 2500 | |
| 884 | Number Challenge | combinatorics dp implementation math number theory | Statement | E | Codeforces Round 146 (Div. 1) {235} | PROGRAMMING | Codeforces Round #146 Tutorial | 2600 | |
| 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 | |
| 29009 | Mashmokh and ACM | combinatorics dp number theory | Statement | B | Codeforces Round 240 (Div. 1) {414} | PROGRAMMING | Codeforces Round #240 Editorial | 1500 | |
| 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 | |
| 3383 | Mike and Foam | bitmasks combinatorics dp math number theory | Statement | C | Codeforces Round 305 (Div. 1) {547} | PROGRAMMING | Codeforces Round #305 Editorial | 2700 | |
| 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 | |
| 2382 | Symmetric and Transitive | combinatorics dp math | Statement | B | Codeforces Round 315 (Div. 1) {568} | PROGRAMMING | Codeforces Round #315 Editorial | 2100 | |
| 1315 | Fence Divercity | combinatorics dp number theory | Statement | G | Codeforces Round 346 (Div. 2) {659} | PROGRAMMING | Editorial for Codeforces Round #346 (Div. 2) | 2500 | |
| 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 | |
| 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 | |
| 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 | |
| 3656 | Anton and School - 2 | combinatorics dp math number theory | Statement | D | Codeforces Round 404 (Div. 2) {785} | PROGRAMMING | Editorial | 2200 | |
| 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 | |
| 3541 | Winter is here | combinatorics dp math number theory | Statement | D | Codeforces Round 428 (Div. 2) {839} | PROGRAMMING | Codeforces Round #428 editorial | 2200 | |
| 4186 | Counting Arrays | combinatorics dp math number theory | Statement | E | Educational Codeforces Round 33 (Rated for Div. 2) {893} | PROGRAMMING | 55989 | 2000 | |
| 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 | |
| 992 | Region Separation | combinatorics dp number theory trees | Statement | C | Codeforces Round 511 (Div. 1) {1034} | PROGRAMMING | Codeforces Round #511 Editorial | 2900 | |
| 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 | |
| 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 | |
| 1771 | Ehab and the Expected GCD Problem | combinatorics dp math number theory | Statement | E | Codeforces Round 563 (Div. 2) {1174} | PROGRAMMING | Codeforces round #563 editorial | 2500 | |
| 1207 | Crossword Expert | combinatorics dp number theory probabilities two pointers | Statement | F | Educational Codeforces Round 68 (Rated for Div. 2) {1194} | PROGRAMMING | Разбор Educational Codeforces Round 68 | 2500 | |
| 2046 | Natasha, Sasha and the Prefix Sums | combinatorics dp math number theory | Statement | E | Codeforces Round 581 (Div. 2) {1204} | PROGRAMMING | 69244 | 2400 | |
| 7790 | Ivan the Fool and the Probability Theory | combinatorics dp math | Statement | A | Codeforces Round 594 (Div. 1) {1239} | PROGRAMMING | Editorial of Codeforces Round #594 (on the problems of Moscow Team Olympiad) | 1700 | |
| 2470 | Cards | combinatorics dp math number theory probabilities | Statement | F | Educational Codeforces Round 78 (Rated for Div. 2) {1278} | PROGRAMMING | Educational Codeforces Round 78 Editorial | 2600 | |
| 2703 | Mocha and Stars | combinatorics dp fft math number theory | Statement | E | Codeforces Round 738 (Div. 2) {1559} | PROGRAMMING | 3000.0 | Tutorial (en) | 2200 |
| 900 | A Random Code Problem | combinatorics dp math number theory | Statement | F | Educational Codeforces Round 121 (Rated for Div. 2) {1626} | PROGRAMMING | 99136 | ||
| 595 | Electrical Efficiency | combinatorics data structures dp number theory trees | Statement | E | COMPFEST 14 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1725} | PROGRAMMING | Tutorial | ||
| 7334 | Count GCD | bitmasks combinatorics dp math number theory | Statement | D | CodeTON Round 3 (Div. 1 + Div. 2, Rated, Prizes!) {1750} | PROGRAMMING | 1750.0 | CodeTON Round 3 (Div. 1 + Div. 2) Editorial | |
| 4450 | Counting Factorizations | combinatorics dp math number theory | Statement | D | Codeforces Round 856 (Div. 2) {1794} | PROGRAMMING | 2000.0 | Codeforces Round 856 (Div. 2) Editorial | |
| 4030 | Counting Rhyme | brute force combinatorics dp math number theory sortings | Statement | D | Codeforces Round 904 (Div. 2) {1884} | PROGRAMMING | 2500.0 | Codeforces Round #904 (Div. 2) Editorial | |
| 3165 | Girl Permutation | combinatorics dp math number theory | Statement | E | Codeforces Round 936 (Div. 2) {1946} | PROGRAMMING | 2250.0 | Codeforces Round #936 (Div. 2) Editorial | |
| 1616 | Carousel of Combinations | brute force combinatorics dp math number theory | Statement | E | Codeforces Round 940 (Div. 2) and CodeCraft-23 {1957} | PROGRAMMING | 2250.0 | Codeforces Round #940 and CodeCraft-23 (Div. 2) Editorial | 2400 |
| 3712 | Natlan Exploring | combinatorics dp math number theory | Statement | G | Codeforces Round 988 (Div. 3) {2037} | PROGRAMMING | Video Tutorial | ||
| 500 | Shohag Loves Counting (Easy Version) | combinatorics dp math number theory | Statement | F1 | CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!) {2039} | PROGRAMMING | 2000.0 | Editorial of CodeTON Round 9 (Div. 1 + Div. 2) | |
| 155 | Beyond the Palindrome (Hard Version) | combinatorics dp math number theory | Statement | E2 | Codeforces Round 1046 (Div. 1) {2135} | PROGRAMMING | 2000.0 | Codeforces Round 1046 (Div. 1, Div. 2) Editorial | |
| 749 | Attraction Theory | combinatorics dp implementation math | Statement | D | Codeforces Round 1053 (Div. 1) {2150} | PROGRAMMING | 2500.0 | Editorial of Codeforces Round 1053 (Div. 1, Div. 2) | |
| 1906 | Little String (Hard Version) | binary search combinatorics dp greedy math number theory | Statement | D2 | Codeforces Round 1075 (Div. 2) {2189} | PROGRAMMING | 750.0 | Codeforces Round 1075 (Div. 2) Editorial |