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135 Two Avenues data structures dfs and similar graphs Statement F Codeforces Round 775 (Div. 1, based on Moscow Open Olympiad in Informatics) {1648} PROGRAMMING 3750.0 Codeforces Round #775 Editorial
678 Lenient Vertex Cover data structures dfs and similar divide and conquer ds graphs Statement F Educational Codeforces Round 128 (Rated for Div. 2) {1680} PROGRAMMING 102852