[C++] 브루트 포싱(Brute Forcing)

#include 
#include 

using namespace std;

string valid = "abcdfeghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";

void bf(string l, int len){
    if(l.length() > len) return;
    
    for(int i = 0; i < valid.length(); i++)
        bf(l + valid[i], len);
    cout << l << endl;
}

int main(){
    bf("", 10);
    return 0;
}