func_code_string: #include <bits/stdc++.h>   using namespace std;   long long bigmod(long long n, long long pow, long long m) {     long long ret = 1;     while (pow) {       if (pow % 2) {         ret *= n;         ret %= m;       }       n *= n;       n %= m;       pow /= 2;     }     return ret;   }   long long arr[3 * 100009];   int main() {     long long n, a, sum = 0, sum1 = 0;     scanf( %I64d , &n);     for (long long i = 1; i <= n; i++) scanf( %I64d , &arr[i]);     sort(arr + 1, arr + n + 1);     for (long long i = 1; i <= n; i++) {       sum += (arr[i] * (bigmod((long long)2, i - 1, 1000000000 + 7)));       sum -= (arr[i] * (bigmod((long long)2, n - i, 1000000000 + 7)));       sum %= 1000000000 + 7;     }     printf( %I64d n , sum);   }   