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2806 Promising String (hard version) data structures implementation math strings Statement F2 Codeforces Round 780 (Div. 3) {1660} PROGRAMMING Codeforces Round #780 (Div. 3) Editorial
3988 Non-Palindromic Substring data structures hashing implementation math strings Statement B Codeforces Round 934 (Div. 1) {1943} PROGRAMMING 1250.0 Codeforces Round #934 (Div1, Div2) Editorial