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7207 The Party and Sweets binary search constructive algorithms greedy implementation math sortings two pointers Statement A Codeforces Round 559 (Div. 1) {1158} PROGRAMMING 66993 1500
11415 Xenia and Colorful Gems binary search greedy math sortings two pointers Statement B Codeforces Round 635 (Div. 1) {1336} PROGRAMMING 750.0 Codeforces Round #635 Editorial 1800