func_code_string: #include <bits/stdc++.h>   int cmpfnc(const void* a, const void* b) { return (*(int*)a - *(int*)b); }   int main() {     int i, n;     scanf( %d , &n);     int arr[300005];     for (i = 0; i < n; i++) scanf( %d , &arr[i]);     qsort(arr, n, sizeof(int), cmpfnc);     long long int sum = arr[0];     long long int count = 1;     long long int t2 = 0;     for (i = 1; i < n; i++) {       long long int t3 =           ((count % 1000000007) * (arr[i] % 1000000007)) % 1000000007;       t2 = (t2 + (t3 - sum + 1000000007) % 1000000007) % 1000000007;       sum = (sum * 2 + arr[i]) % 1000000007;       count = (count * 2 + 1) % 1000000007;     }     printf( %lld n , t2);     return 0;   }   