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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