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13486 Prefix Flip (Hard Version) constructive algorithms data structures strings two pointers Statement A2 Codeforces Round 658 (Div. 1) {1381} PROGRAMMING 500.0 Codeforces Round #658 Editorial 1700
14721 awoo's Favorite Problem constructive algorithms data structures dp greedy implementation strings two pointers Statement C Educational Codeforces Round 130 (Rated for Div. 2) {1697} PROGRAMMING 103835