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4256 PFAST Inc. bitmasks brute force graphs Statement B Codeforces Beta Round 86 (Div. 2 Only) {114} PROGRAMMING Codeforces Beta Round #86 Editorial 1500
609 Travelling Through the Snow Queen's Kingdom bitmasks brute force divide and conquer graphs Statement E Codeforces Round 359 (Div. 1) {685} PROGRAMMING Codeforces Round #359 Editorial 2700
157 Hex Dyslexia bitmasks brute force dp graphs Statement E MemSQL Start[c]UP 3.0 - Round 2 (onsite finalists) {865} PROGRAMMING MemSQL Start[c]UP 3.0 Round 2 Editorial 2700
1505 Party bitmasks brute force dp graphs Statement C 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
1094 Maximum Matching bitmasks brute force dfs and similar dp graphs Statement E Codeforces Round 508 (Div. 2) {1038} PROGRAMMING Tutorial 2400
2348 Elongated Matrix binary search bitmasks brute force dp graphs Statement F Codeforces Round 531 (Div. 3) {1102} PROGRAMMING 64439 2400
1008 Magical Permutation bitmasks brute force constructive algorithms data structures graphs math Statement E Codeforces Round 558 (Div. 2) {1163} PROGRAMMING 66943 2800
7412 Shortest Cycle bitmasks brute force graphs shortest paths Statement B Codeforces Round 580 (Div. 1) {1205} PROGRAMMING 69158 1900
6769 Strange Definition bitmasks brute force data structures graphs math number theory Statement B Codeforces Round 694 (Div. 1) {1470} PROGRAMMING 750.0 86464
1962 AND-MEX Walk bitmasks brute force data structures dfs and similar dsu graphs greedy Statement E Codeforces Round 782 (Div. 2) {1659} PROGRAMMING 2250.0 Codeforces Round #782 (Div. 2) Editorial
1357 ANDfinity bitmasks brute force constructive algorithms dfs and similar dsu graphs Statement E Codeforces Round 798 (Div. 2) {1689} PROGRAMMING 2500.0 Editorial for Codeforces Round #798 (Div. 2)
1127 Tree Recovery bitmasks brute force constructive algorithms dfs and similar dsu graphs trees Statement F Codeforces Global Round 21 {1696} PROGRAMMING 2500.0 Editorial of Codeforces Global Round 21
1922 Kirill and Company bitmasks brute force dp graphs shortest paths Statement G Codeforces Round 826 (Div. 3) {1741} PROGRAMMING 107908
10240 SlavicG's Favorite Problem bitmasks brute force constructive algorithms data structures dfs and similar graphs greedy Statement G Codeforces Round 835 (Div. 4) {1760} PROGRAMMING 109348
1249 Algebra Flash bitmasks brute force dp graphs meet-in-the-middle trees Statement E Educational Codeforces Round 140 (Rated for Div. 2) {1767} PROGRAMMING 110225
1946 Walk the Runway bitmasks brute force data structures dp graphs implementation sortings Statement E Codeforces Round 870 (Div. 2) {1826} PROGRAMMING 2500.0 Codeforces Round #870 (Div. 2) Editorial 2400
2065 Sasha and the Happy Tree Cutting bitmasks brute force dp fft graphs greedy trees Statement E Codeforces Round 926 (Div. 2) {1929} PROGRAMMING 2500.0 Codeforces Round #926 (Div. 2) Editorial.
23267 Substring and Subsequence bitmasks brute force dp graphs greedy hashing strings trees Statement B Educational Codeforces Round 167 (Rated for Div. 2) {1989} PROGRAMMING Educational Codeforces Round 167 Editorial
2877 Cases bitmasks brute force combinatorics dfs and similar dp graphs greedy strings Statement D Codeforces Round 961 (Div. 2) {1995} PROGRAMMING 2250.0 Video Tutorial
1816 Matrix Transformation bitmasks brute force dfs and similar graphs implementation Statement E Educational Codeforces Round 173 (Rated for Div. 2) {2043} PROGRAMMING Educational Codeforces Round 173 Editorial