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  1. Prepare
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  3. STL
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Sets-STL

  • ernprivado
     + 0 comments
    int q;
cin>>q;``
while(q>0)
{
    int y, x;
    cin>>y>>x;
    if(y==1){qX.insert(x);}
    if(y==2){qX.erase(x);}
    if(y==3){
        auto it = qX.find(x);
        if(it != qX.end()){cout<<"Yes\n";}
        else{cout<<"No\n";}
    }
    q--;}