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3891 Mahmoud and a Dictionary data structures dfs and similar dp dsu graphs Statement D Codeforces Round 396 (Div. 2) {766} PROGRAMMING Codeforces round #396 editorial 2000
1805 Light Bulbs (Hard Version) combinatorics data structures dfs and similar dp dsu graphs hashing Statement G2 Codeforces Round 916 (Div. 3) {1914} PROGRAMMING Codeforces Round 916 (Div. 3) Editorial