#include <iostream> #include <string> using namespace std; int main(){ int N,Q, count; cin >> Q; char c; string S, T; bool flag = false; if(Q >=1 && Q <= 1000){ while(Q){ count = 0; cin >> N; if( N>=1 && N <=100){ cin >> S; for(int i=0;i < N; ++i){ if(S[i] != '0' && S[i]!= '1'){ flag = false; } } cin >> T; for(int i=0; i < N; ++i){ if(T[i] != '0' && T[i]!= '1'){ flag = false; } } if(flag == false){ --Q; continue; } // cout << "The values in S and T are : " << S << "\t" << T; for(int i=0; i <N ; ++i){ for(int j=0; j < N; ++j){ if(S[i] == '1' && T[j]=='1'){ S[i] = 0; T[j] = 0; ++count; break; } } } cout << count << endl; } --Q; } } return 0; }