c++题解

#include<bits/stdc++.h>
using namespace std;
#define int long long
unordered_map<int,int> cnt;
signed main(){
int x,q;
char op;
cin>>q;
while(q--){
    cin>>op>>x;
    if(op=='I'){
       cnt[x]++;
    }
    if(op=='Q'){
        if(cnt[x]){
            cout<<"Yes"<<endl;
        }
        else cout<<"No"<<endl;
    }
}
}