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7886 Path Prefixes binary search data structures dfs and similar implementation trees Statement G Codeforces Round 811 (Div. 3) {1714} PROGRAMMING Codeforces Round #811 (Div. 3) Editorial
1057 Tree Queries binary search data structures dfs and similar implementation trees Statement E Codeforces Round 914 (Div. 2) {1904} PROGRAMMING 2750.0 Codeforces Round 914 (Div. 2) Editorial
2402 Chain Queries binary search data structures dfs and similar implementation trees Statement E Codeforces Round 947 (Div. 1 + Div. 2) {1975} PROGRAMMING 2000.0 editorial_zh.pdf 2100