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using namespace std;
int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */
int n; cin>>n; set<int> s; while(n--){ int a,b; cin>>a>>b; if(a==1){ s.insert(b); } else if(a==2){ s.erase(b); } else if(a==3){ set<int>::iterator itr = s.find(b); if(itr!=s.end()){ cout<<"Yes"<<endl; } else{ cout<<"No"<<endl; } } } return 0;
}
Sets-STL
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include
include
include
include
include
include
using namespace std;
int main() { /* Enter your code here. Read input from STDIN. Print output to STDOUT */
}