c 2b 2b find element in vector

1#include <algorithm>
2#include <vector>
3
4if ( std::find(vec.begin(), vec.end(), item) != vec.end() )
5   do_this();
6else
7   do_that();

1auto it = find(vec.begin(),vec,end(), item)!
2if(it != vec.end()){
3 	 int index = it - vec.begin();
4}