[LeetCode] Add Edges to Make Degrees of All Nodes Even

2508. Add Edges to Make Degrees of All Nodes Even There is an undirected graph consisting of n nodes numbered from 1 to n. You are given the integer n and a 2D array edges where edges[i] = [ai, bi] indicates that there is an edge between nodes ai and bi. The graph can be disconnected. You can add at most two additional edges (possibly none) to this graph so that there are no repeated edges and no self-loops. Return true if it is possible to make the degree of each node in the graph even, otherw...

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