Increasing Array

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

int main() {
  int n;
  cin >> n;
  int a, b;
  int c = 0;

  for(int i=0; i<n; i++) {
    a = b;
    cin >> b;
    if (i == 0)
    {
        continue;
    }
    int d = a - b + 1;
    if (d <= 0) {
      continue;
    } else if (d > c) {
      c = d;
    }
  }

  cout << c << endl;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: ACCEPTED