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Minimum Spanning Tree problems
Problem Name Online Judge Contest Difficulty Level
1 Lazy Student Categories Codeforces Codeforces Round #335 (Div. 1) & Codeforces Round #335 (Div. 2) 4
2 The Child and Zoo Categories Codeforces Codeforces Round #250 (Div. 2) & Codeforces Round #250 (Div. 1) 4
3 Minimum spanning tree for each edge Categories Codeforces Educational Codeforces Round 3 5
4 Hamiltonian Spanning Tree Categories Codeforces Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) 6
5 Edges in MST Categories Codeforces Codeforces Round #111 (Div. 2) 7