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1147 Region Separation combinatorics dp number theory trees Statement C Codeforces Round 511 (Div. 1) {1034} PROGRAMMING Codeforces Round #511 Editorial 2900
1551 Sasha and Interesting Fact from Graph Theory brute force combinatorics dp math trees Statement D Codeforces Round 539 (Div. 1) {1109} PROGRAMMING Codeforces Round #539 Editorial 2600
642 Electrical Efficiency combinatorics data structures dp number theory trees Statement E COMPFEST 14 - Preliminary Online Mirror (Unrated, ICPC Rules, Teams Preferred) {1725} PROGRAMMING Tutorial
6175 Fair and Square combinatorics dp graphs math number theory trees Statement E Codeforces Round 1107 (Div. 3) {2241} PROGRAMMING Codeforces Round 1107 (Div. 3) Editorial