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5666 Set To Max (Hard Version) binary search constructive algorithms data structures dsu greedy implementation sortings two pointers Statement D2 Codeforces Round 914 (Div. 2) {1904} PROGRAMMING 750.0 Codeforces Round 914 (Div. 2) Editorial
5391 Changing the String binary search data structures greedy implementation sortings strings Statement E Educational Codeforces Round 179 (Rated for Div. 2) {2111} PROGRAMMING Educational Codeforces Round 179 Editorial