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5925 Number of Simple Paths combinatorics data structures dfs and similar ds graphs trees Statement E Codeforces Round 686 (Div. 3) {1454} PROGRAMMING Codeforces Round #686 (Div. 3) Editorial
2798 Preorder combinatorics divide and conquer dp ds hashing trees Statement E Educational Codeforces Round 127 (Rated for Div. 2) {1671} PROGRAMMING 102181
231 Imitating the Key Tree combinatorics ds trees Statement I COMPFEST 14 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1725} PROGRAMMING Tutorial