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5098 Alyona and a tree binary search data structures dfs and similar graphs trees Statement B Codeforces Round 381 (Div. 1) {739} PROGRAMMING 48582 2000
6216 Reset K Edges binary search data structures dfs and similar graphs greedy trees Statement D Educational Codeforces Round 136 (Rated for Div. 2) {1739} PROGRAMMING Educational Codeforces Round 136 Editorial