[LeetCode]547. Friend Circles朋友圈数量--不相邻子图问题

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[LeetCode]547. Friend Circles朋友圈数量--不相邻子图问题

/* 思路就是遍历所有人,对于每一个人,寻找他的好友,找到好友后再找这个好友的好友 ,这样深度优先遍历下去,设置一个flag记录是否已经遍历了这个人. 其实dfs真正有用的是flag这个变量,因为如果m个人最多m个朋友圈,设置后flag后,相同的朋友圈会检测到flag就会不算数. */ public int findCircleNum(int[][] M) { int m = M.length; if (m==0) return 0; int res = 0; boolean[] flag =…

[LeetCode] 547. Friend Circles 朋友圈

There are N students in a class. Some of them are friends, while some are not. Their friendship is transitive in nature. For example, if A is a direct friend of B, and B is a direct friend of C, then A is an indirect friend of C. And we defined a fri…

LeetCode 547. Friend Circles 朋友圈(C++/Java)

题目: https://leetcode.com/problems/friend-circles/ There are N students in a class. Some of them are friends, while some are not. Their friendship is transitive in nature. For example, if A is a direct friend of B, and B is a direct friend of C, then…

547 Friend Circles 朋友圈

班上有 N 名学生.其中有些人是朋友,有些则不是.他们的友谊具有是传递性.如果已知 A 是 B 的朋友,B 是 C 的朋友,那么我们可以认为 A 也是 C 的朋友.所谓的朋友圈,是指所有朋友的集合.给定一个 N * N 的矩阵 M,表示班级中学生之间的朋友关系.如果M[i][j] = 1,表示已知第 i 个和 j 个学生互为朋友关系,否则为不知道.你必须输出所有学生中的已知的朋友圈总数.示例 1:输入: [[1,1,0], [1,1,0], [0,0,1]]输出: 2 说明:已知学生0和学生1互…

[LeetCode] Friend Circles 朋友圈

There are N students in a class. Some of them are friends, while some are not. Their friendship is transitive in nature. For example, if A is a direct friend of B, and B is a direct friend of C, then A is an indirect friend of C. And we defined a fri…

547. Friend Circles 求间接朋友形成的朋友圈数量

［抄题］: There are N students in a class. Some of them are friends, while some are not. Their friendship is transitive in nature. For example, if A is a direct friend of B, and B is a direct friend of C, then A is an indirect friend of C. And we defined…