Simulation!!

#include <iostream>
#include <algorithm>
#include <climits>

using namespace std;
int n;

int main(void) {
  scanf("%d", &n);
  int a[n];
  for (int i = 0; i < n; ++i) scanf("%d", &a[i]);
  sort(a, a + n);

  int ans = INT_MAX;
  for (int i = 1; i < n; ++i)
    ans = min(ans, a[i] - a[i - 1]);

  printf("%d\n", ans);
  return 0;
}