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493 Andrew and Chemistry dp hashing trees Statement D Codeforces Round 373 (Div. 1) {718} PROGRAMMING Codeforces Round #373 — Editorial 2900
1001 Complete Mirror constructive algorithms dfs and similar dp hashing implementation trees Statement D Codeforces Round 566 (Div. 2) {1182} PROGRAMMING 67614 2500
3163 Preorder combinatorics divide and conquer dp dsu hashing trees Statement E Educational Codeforces Round 127 (Rated for Div. 2) {1671} PROGRAMMING 102181
1526 Labeling the Tree with Distances data structures dp hashing implementation trees Statement E Codeforces Round 856 (Div. 2) {1794} PROGRAMMING 2750.0 Codeforces Round 856 (Div. 2) Editorial
23270 Substring and Subsequence bitmasks brute force dp graphs greedy hashing strings trees Statement B Educational Codeforces Round 167 (Rated for Div. 2) {1989} PROGRAMMING Educational Codeforces Round 167 Editorial