Thread: locate index

It determines the location index of a number k.

Code:

#include <iostream>
using namespace std;

int main()
{
	int a[1024], k, x, i, flag;
	unsigned int n;

	cin >> k >> n;

	for ( i = 0; i < n; i++ )
	{
		cin >> x;
		a[i] = x;
	}
	for ( i = 0; i < n; i++ )
	{
		if ( a[i] == k )
		{
			flag = i;
			break;
		}
		else
			flag = -1;
	}
	cout << flag <<endl;
}

If I use vector instead of array, is there a function that can do that?