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4642 0-1-Tree dfs and similar divide and conquer dp dsu trees Statement D Educational Codeforces Round 64 (Rated for Div. 2) {1156} PROGRAMMING 66827 2300
2290 Unique Occurrences data structures dfs and similar divide and conquer dp dsu trees Statement F Educational Codeforces Round 129 (Rated for Div. 2) {1681} PROGRAMMING 103163 2300
5114 Count Paths data structures dfs and similar divide and conquer dp dsu trees Statement E Educational Codeforces Round 162 (Rated for Div. 2) {1923} PROGRAMMING Educational Codeforces Round 162 Editorial