#include <bits/stdc++.h>
using namespace std;
int main()
{
vector<int> v{0,1,2,3,4,5};
auto it=v.begin()+3;
cout<<*it<<"\n";
v.erase(it);
cout<<(it==v.begin()+3)<<"\n";
cout<<*it<<"\n";
}
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