func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[200100];   int sub[200100];   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     ;     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       for (int i = 1; i <= n; i++) {         cin >> a[i];       }       sort(a + 1, a + n + 1);       for (int i = 1; i <= n; i++) {         sub[i] = sub[i - 1] + a[i - 1];         a[i] = a[i] - sub[i];       }       sort(a + 1, a + 1 + n);       cout << a[n] << endl;       memset(sub, 0, sizeof(sub));     }   }   