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561 Rain of Fire binary search dfs and similar dsu graphs implementation sortings Statement F Codeforces Round 671 (Div. 2) {1419} PROGRAMMING 3000.0 Codeforces Round #671 Editorial
2724 Unusual Minesweeper binary search dfs and similar dsu implementation sortings Statement G Codeforces Round 762 (Div. 3) {1619} PROGRAMMING Tutorial