#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define inf 0x3f3f3f3f
ll read() {
	ll s=0,f=1;char ch=getchar();
	while(ch<'0'||ch>'9'){if(ch=='-')f=-1;ch=getchar();}
	while(ch>='0'&&ch<='9'){s=s*10+ch-'0';ch=getchar();}
	return s*f;
}
#define maxn 30005
int fa[maxn],dis[maxn],length[maxn];
int find(int x) {
	if(fa[x]==x) return x;
	int nx=find(fa[x]);
	dis[x]+=dis[fa[x]];
	return fa[x]=nx;
}
void move(int x,int y) {
	int xx=find(x),yy=find(y);
	fa[xx]=yy;
	dis[xx]+=length[yy];
	length[yy]+=length[xx];
}
void check(int x) {
	int xx=find(x);
	printf("%d\n",dis[x]);
}
int n;
int main() {
	for(int i=1;i<=maxn;i++) fa[i]=i;
	for(int i=1;i<=maxn;i++) length[i]=1;
	n=read();
	while(n--) {
		char opt;scanf("%1s",&opt);
		int x=read();
		if(opt=='M') {
			int y=read();
			move(x,y);
		}else if(opt=='C') {
			check(x);
		}
	}
	return 0;
}

这个n在这里输入就没有问题,而

int n;
int main() {
	n=read();
	for(int i=1;i<=maxn;i++) fa[i]=i;
	for(int i=1;i<=maxn;i++) length[i]=1;
   //上方的n在这里读入
	while(n--) {
		char opt;scanf("%1s",&opt);
		int x=read();
		if(opt=='M') {
			int y=read();
			move(x,y);
		}else if(opt=='C') {
			check(x);
		}
	}
	return 0;
}

n在这个位置读入就会出锅呢