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3852 Basic Diplomacy constructive algorithms flows greedy implementation Statement A Codeforces Round 709 (Div. 1, based on Technocup 2021 Final Round) {1483} PROGRAMMING 500.0 Technocup 2021: Final Round and Codeforces Round #709 — tutorial
2289 Nastia Plays with a Tree constructive algorithms data structures dfs and similar dp flows graphs greedy implementation trees Statement D Codeforces Round 720 (Div. 2) {1521} PROGRAMMING 2250.0 90477