Question

How to find the index of the second element with specific value in a list using c++

Answer 1

#include <iostream>
#include <list>
#include <algorithm>

using std::list;
using std::cout;
using std::endl;

int main()
{
	list<int> lst = { 3, 8, 6, 9, 7, 6, 2 };

	list<int>::iterator pos1;
	pos1 = find(lst.begin(), lst.end(), 6);

	list<int>::iterator pos2;
	if (pos1 != lst.end())
		pos2 = find(++pos1, lst.end(), 6);

	cout << std::distance(lst.begin(), pos2) << endl;

	return 0;
}


/*
run:

5

*/

 

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