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2228 Omsk Metro (hard version) data structures dfs and similar divide and conquer dp implementation math trees Statement F2 Codeforces Round 881 (Div. 3) {1843} PROGRAMMING Codeforces Round #881 (Div. 3) Editorial
5920 Invertible Bracket Sequences binary search combinatorics data structures divide and conquer implementation two pointers Statement D Educational Codeforces Round 166 (Rated for Div. 2) {1976} PROGRAMMING Educational Codeforces Round 166 Editorial
79 String (Easy Version) divide and conquer implementation strings Statement E1 Codeforces Round 1112 (Div. 1) {2249} PROGRAMMING 2250.0
51 String (Hard Version) divide and conquer implementation strings Statement E2 Codeforces Round 1112 (Div. 1) {2249} PROGRAMMING 1750.0