Luogu P2342 叠积木 加权并查集

可能这是一类题目吧，这道题比较典型，可以当作模板。

 1 #include<iostream>
 2 #include<cstdio>
 3 using namespace std;
 4 
 5 const int Maxn = 30030; 
 6 
 7 int fa[Maxn],d[Maxn],size[Maxn];
 8 int find(int x){
 9     if(fa[x] == x)return x;
10     int rt = find(fa[x]);
11     d[x] += d[fa[x]];
12     return fa[x] = rt; 
13 }
14 
15 void merge(int x,int y){
16     x = find(x),y = find(y);
17     if(x != y){
18         fa[x] = y;
19         d[x] = size[y],size[y] += size[x];
20     }
21 }
22 
23 int p,x,y;
24 char ch;
25 
26 int main(){
27     for(int i = 1;i <= 30000;i++)fa[i] = i,size[i] = 1,d[i] = 0;
28     cin >> p;
29     while(p--){
30         cin >> ch;
31         if(ch == 'C'){
32             cin >> x;
33             find(x);
34             cout << d[x] << '\n';
35         }
36         else{
37             cin >> x >> y;
38             merge(x,y);
39         }
40     }
41 return 0;
42 }

 

来源：https://www.cnblogs.com/Wangsheng5/p/11688974.html