Vector subscript out of range error

[ftothemizzo]

Why am i getting this error message.

  	for (int i = 0; i < a.size(); i++){
				if (a[i] == y)
				a.erase(a.begin()+i);
				cout << a[i] << " ";
			}

[keskiverto]

What if that is preceeded by:

1 2 3

int y { 42 }; vector<int> a { y };

y==42 a.size()==1 a[0]==42==y

The loop will do one round.
The first and only element of the vector is erased.
==>
There is no a[0]. out-of-range