func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   using vi = vector<int>;   using db = double;   const int mxn = 300006;   const ll mod = 1E9L + 7;   int n;   ll a[mxn];   ll p[mxn];   int main() {     cin >> n;     for (int i = 0; i < n; ++i) scanf( %lld , &a[i]);     sort(a, a + n);     p[0] = 1;     for (int i = 1; i <= n; ++i) p[i] = p[i - 1] * 2 % mod;     ll ans = 0;     for (int i = 0; i < n; ++i) {       ans -= a[i] * p[n - 1 - i];       ans += a[i] * p[i];       ans %= mod;     }     cout << (ans + mod) % mod << endl;     return 0;   }   