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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
10730 Count Triangles binary search implementation math two pointers Statement C Codeforces Round 643 (Div. 2) {1355} PROGRAMMING 1250.0 Codeforces Round #643 (Div. 2) Editorial 1800