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1779 The Hidden Pair (Easy Version) binary search dfs and similar graphs interactive shortest paths trees Statement F1 Codeforces Round 651 (Div. 2) {1370} PROGRAMMING 2000.0 Editorial — Codeforces Round #651
1662 The Hidden Pair (Hard Version) binary search dfs and similar graphs interactive shortest paths trees Statement F2 Codeforces Round 651 (Div. 2) {1370} PROGRAMMING 1250.0 Editorial — Codeforces Round #651