题目:
链接:点击打开链接
题意:
给出n个直接认识的朋友,最大的直接或间接认识的朋友。
思路:
算法:
并查集,,,
代码:
#include<iostream> #include<cstdio> #include<cstring> using namespace std; #define MAXN 100010 int root[MAXN]; int member[MAXN];//表示在i结点处的,认识的朋友 int find(int x) { return x == root[x] ? x : root[x] = find( root[x] ); } void merge(int x,int y) { int fx = find(x); int fy = find(y); if(fx != fy) { root[fx] = fy; member[fy] += member[fx]; } } int main() { //freopen("input.txt","r",stdin); int n,a,b; int fa,maxn; while(scanf("%d",&n) != EOF) { for(int i=0; i<MAXN; i++) { root[i] = i; member[i] = 1; } fa = 1; for(int i=0; i<n; i++) { scanf("%d%d",&a,&b); if(a>fa || b>fa) fa = max(a,b); merge(a,b); } maxn = 0; for(int i=1; i<=fa; i++) { if(member[i] > maxn) maxn = member[i]; } printf("%d\n",maxn); } return 0; }
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原文地址:http://blog.csdn.net/u013147615/article/details/26414039