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1692 Omsk Metro (hard version) data structures dfs and similar divide and conquer dp implementation math trees Statement F2 Codeforces Round 881 (Div. 3) {1843} PROGRAMMING Codeforces Round #881 (Div. 3) Editorial
239 Bermart Ice Cream data structures dfs and similar divide and conquer dp implementation trees Statement F Educational Codeforces Round 171 (Rated for Div. 2) {2026} PROGRAMMING