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6855 Boboniu Chats with Du brute force dp greedy sortings two pointers Statement A Codeforces Round 664 (Div. 1) {1394} PROGRAMMING 500.0 Codeforces Round #664 Editorial 1800
6177 Smithing Skill brute force dp greedy math sortings two pointers Statement D Educational Codeforces Round 167 (Rated for Div. 2) {1989} PROGRAMMING Educational Codeforces Round 167 Editorial