#include <bits/stdc++.h>   using namespace std;   int main() {     int t, n, c0, c1, h, cc0 = 0, cc1 = 0;     cin >> t;     cout << endl;     for (int i = 0; i < t; i++) {       cin >> n >> c0 >> c1 >> h;       cout << endl;       string ali;       cin >> ali;       bitset<1001> ss(ali);       cc1 = ss.count();       cc0 = n - cc1;       int min_d = (cc1 * c1) + (cc0 * c0);       if (c0 < c1) {         int maliyet = cc1 * c0 + cc0 * c0 + cc1 * h;         min_d = min(min_d, maliyet);       } else {         int maliyet = cc1 * c1 + cc0 * c1 + cc0 * h;         min_d = min(min_d, maliyet);       }       cout << endl << min_d << endl;     }     return 0;   }   