. Find out whether is possible for him to choose some of the edges such that the i-th vertex is incident with exactly
Bobo has a graph with n vertices and m edges where the i-th edge is between the vertices a_i a i and b_i b i . Find out whether is possible for him to choose some of the edges such that the i-th vertex is incident with exactly d_i d i edges.
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标签： HBC2094381or2题解
