int main()
{
vector<int> v = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20} ;
auto it = v.begin() ;
for( ; it != v.end(); ){
if( *it % 2 == 1 )
it = v.erase(it) ;
else
++it ;
}
for( it = v.begin(); it != v.end(); it++){
cout << "(" << *it << ")" << endl ;
}
}
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