Problem: TRAVELPS , Contest: SEPT21C

														 
                  #include <bits/stdc++.h>
                  using namespace std;
                  int main() {
                  int t;
                  cin>>t;
                  while(t--)
                  {
                          int n, a, b,c=0,d=0;
                          cin >>n>>a>>b;
                          string e;
                          cin>>e;
                          for (int i=0;i<n;i++)
                          {
                              if(e[i]=='0')
                              c++;
                              else
                              d++;
                          }
                          int sol=0;
                          sol=((c*a)+(d*b));
                          cout<<sol<<endl;
                      }
                      return 0;
                  }