Increasing Array

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

int main() {
  int n;
  cin >> n;
  int start;
  int max = 0;
  int current;

  for(int i=0; i<n; i++) {
    cin >> current;
    if (i == 0) {
      start = current;
      continue;
    }

    int dif = i - current + start;

    if (dif > max)
      max = dif;
  }

  cout << max << 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