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【并查集】 so easy 附代码#include <iostream>
#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
const int N=30005;
int fa[N],son[N],dist[N];
int FA(int x)
{
if(fa[x]==x) return x;
int ans=FA(fa[x]);
dist[x]+=dist[fa[x]];
return fa[x]=ans;
}
void Union(int x,int y)
{
int fax=FA(x);
int fay=FA(y);
if(fax==fay) return;
fa[fax]=fay;
dist[fax]=son[fay]+1;
son[fay]+=son[fax]+1;
}
void init()
{
for(int i=1;i<N;i++)
fa[i]=i;
int m;cin>>m;
while(m--)
{
char ss[10];
scanf("%s",ss);
if(ss[0]=='M')
{
int s,t;
scanf("%d %d",&s,&t);
Union(s,t);
// printf("%d : %d %d %d\n",s,FA(s),son[s],dist[s]);
// printf("%d : %d %d %d\n",t,FA(t),son[t],dist[t]);
}
else
{
int x;scanf("%d",&x);
FA(x);
printf("%d\n",dist[x]);
}
}
}
int main()
{
// freopen("in.txt","r",stdin);
init();
// cout << "Hello world!" << endl;
return 0;
}
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