合作网络 La3027 【并查集】

并查集 路径查询`

#include <bits/stdc++.h>
using namespace std;
const int maxn =1e5+50;
const int mod = 1e9+7;
int fa[maxn];
int edge[maxn];
int n;
void init()
{
	for(int i=0;i<maxn;i++) fa[i]=i;
	memset(edge,0,sizeof(edge));
}
int findset(int t)
{
	if(fa[t]==t) return edge[t];
	else return findset(fa[t])+edge[t];
}
void Union(int u,int v)
{
	fa[u]= v;
	edge[u] = abs(u-v)%1000;
}
int main()
{
	int T;
	scanf("%d",&T);
	while(T--)
	{
		init();
		scanf("%d",&n);
		while(1)
		{
			char ch[10]; int x,y;
			scanf("%s",ch);
			if(ch[0]=='E')
			{
				scanf("%d",&x);
				int ans = findset(x);
				printf("%d\n",ans);
			}
			else if(ch[0]=='I')
			{
				scanf("%d%d",&x,&y);
				Union(x,y);
			}
			else if(ch[0]=='O')
				{break;}

		}
	}
	return 0;
}
/* 1 4 E 3 I 3 1 E 3 I 1 2 E 3 I 2 4 E 3 O */