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9993 Close Tuples (hard version) binary search combinatorics implementation math sortings two pointers Statement E2 Codeforces Round 690 (Div. 3) {1462} PROGRAMMING Codeforces Round #690 (Div. 3) Editorial
992 Group Photo binary search combinatorics implementation two pointers Statement E Contest 2050 and Codeforces Round 718 (Div. 1 + Div. 2) {1517} PROGRAMMING 2500.0 Contest 2050 and Codeforces Round #718 (Div.1 + Div.2) Editorial
4773 Invertible Bracket Sequences binary search combinatorics data structures divide and conquer implementation two pointers Statement D Educational Codeforces Round 166 (Rated for Div. 2) {1976} PROGRAMMING Educational Codeforces Round 166 Editorial
1468 The Endspeaker (Hard Version) binary search combinatorics data structures dp greedy implementation two pointers Statement D2 Codeforces Round 982 (Div. 2) {2027} PROGRAMMING 1000.0