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3274 Let's Play the Words? data structures hashing implementation math Statement D Codeforces Round 606 (Div. 2, based on Technocup 2020 Elimination Round 4) {1277} PROGRAMMING Technocup 2020 — Elimination Round 4 + Codeforces Round 606: Editorial 1800
4528 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