Increasing Array

input/code.cpp: In function 'int main()':
input/code.cpp:6:9: warning: unused variable 'i' [-Wunused-variable]
  int n, i;
         ^

#include<bits/stdc++.h>
using namespace std;

int main()
{
	int n, i;
	int edits=0, last_num=1;
	cin >> n;

	for(int i=0;i<n;i++) {
        int num, diff;
        cin >> num;
        diff = last_num - num;
        if (diff > 0) {
            edits += diff;
            num += diff;
        }
        last_num = num;
	}
	cout << edits;
    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