func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int n;     cin >> n;     int a[1001];     int b[1001] = {0};     for (int i = 0; i < n; i++) {       cin >> a[i];       b[a[i]] = 1;     }     sort(a, a + n);     int ans = 0;     int sum = a[n - 1] - a[0] + 1;     cout << sum - n << endl;     return 0;   }   