Increasing Array

#include <iostream>
#include <sstream>
#include<string>
#include <vector>
using namespace std;




int main() {

	int n;
	vector<double> a;
	double min = 0;

	cin >> n;

	for(double i = 0; i < n; i++) {
		double temp;
		cin >> temp;
		a.push_back(temp);
	}

	double i = 1;
	while(i < n) {
		if(a[i] < a[i-1]) {
			double dif = a[i-1] - a[i];
			a[i] = a[i] + dif;
			min = min + dif;
		}
		i++;
	}

	cout << min << endl;

	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED