Increasing Array

#include<iostream>

using namespace std;

int main()
{
	long long n, x,x1,cnt=0;

	cin >> n>>x;

	for (int i = 1; i < n; i++)
	{
		cin >> x1;

		if (x > x1)
		{
			cnt += (x - x1);
		}
		else
		{
			x = x1;
		}

	}
	cout << cnt << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED