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2968 Persistent Bookcase bitmasks data structures dfs and similar implementation Statement D Codeforces Round 368 (Div. 2) {707} PROGRAMMING 46662 2100
1463 Trees and XOR Queries Again bitmasks data structures dfs and similar implementation math trees Statement F Educational Codeforces Round 159 (Rated for Div. 2) {1902} PROGRAMMING Educational Codeforces Round 159 Editorial