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5659 Array Repetition binary search data structures dp implementation math Statement D Codeforces Round 919 (Div. 2) {1920} PROGRAMMING 2000.0 Editorial for Codeforces Round #919 (Div. 2)
3864 Sums of Segments binary search data structures dp implementation math Statement D Educational Codeforces Round 171 (Rated for Div. 2) {2026} PROGRAMMING