摘要： 原题链接在这里：https://leetcode.com/problems/redundant-connection-ii/ 题目： In this problem, a rooted tree is a directed graph such that, there is exactly one 阅读全文

摘要： 原题链接在这里：https://leetcode.com/problems/redundant-connection/ 题目： In this problem, a tree is an undirected graph that is connected and has no cycles. Th 阅读全文