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10169 Integers Have Friends binary search data structures math number theory two pointers Statement B Codeforces Round 736 (Div. 1) {1548} PROGRAMMING 1000.0 Codeforces Round 736 Editorial
4799 New Year Concert binary search data structures dp greedy math number theory two pointers Statement D Codeforces Round 769 (Div. 2) {1632} PROGRAMMING 2000.0 Editorial of Codeforces Round #769
2357 MEX of LCM binary search brute force data structures implementation math number theory two pointers Statement E Codeforces Round 879 (Div. 2) {1834} PROGRAMMING 2500.0 Codeforces Round #879 Editorial