Iterator in C++ STL
//Iterator declaration Systems.
#include <iostream>
using namespace std;
int main()
{
vector v; int n; cin>>n;
for (int i = 0; i < n; ++i)
{ int x;cin>>x; v.push_back(x); } // 1st approch /*vector :: iterator it = v.begin();
for (it = v.begin(); it!=...
