func_code_string: #include <bits/stdc++.h>   using namespace std;   bitset<20> a;   vector<int> w;   int sol = 0;   void verific(int &l, int &r, int &x) {     int sum = 0, i, minim = INT_MAX, maxim = INT_MIN;     for (i = 0; i < w.size(); ++i) {       if (a[i]) {         sum += w[i];         minim = min(minim, w[i]);         maxim = max(maxim, w[i]);       }     }     if (sum >= l and sum <= r and maxim - minim >= x) ++sol;   }   int main() {     int n, i, val, l, r, x;     cin >> n >> l >> r >> x;     for (i = 1; i <= n; ++i) {       cin >> val;       w.push_back(val);     }     for (i = 1; i <= 1 << n; ++i) {       a = i;       if (i & (i - 1) == 0) continue;       verific(l, r, x);     }     cout << sol;     return 0;   }   