[LeetCode] 684. Redundant Connection 冗余的連接
In this problem, a tree is an undirected graph that is connected and has no cycles. The given in ...
原文：[LeetCode] 685. Redundant Connection II 冗余的連接之二
In this problem, a rooted tree is adirectedgraph such that, there is exactly one node the root for which all other nodes are descendants of this node, plus every node has exactly one parent, except f ...
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