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13768 Little Alawn's Puzzle combinatorics dfs and similar dp dsu graphs math Statement C Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) {1534} PROGRAMMING 1250.0 Codeforces LATOKEN Round 1 (Div. 1 + Div. 2) Editorial
1184 DSU Master combinatorics dp dsu math Statement D Codeforces Round 858 (Div. 2) {1806} PROGRAMMING 2000.0 Codeforces Round #858 (Div. 2) Editorial
280 Multiple of Three Cycles combinatorics dp dsu math Statement H Codeforces Round 884 (Div. 1 + Div. 2) {1844} PROGRAMMING 4000.0 Codeforces Round #884 (Div. 1 + Div. 2) Editorial
2385 Light Bulbs (Easy Version) brute force combinatorics dfs and similar dp dsu graphs math Statement G1 Codeforces Round 916 (Div. 3) {1914} PROGRAMMING Codeforces Round 916 (Div. 3) Editorial