求给个点赞吧！
#include<bits/stdc++.h>
using namespace std;
long long f(int k,string s){
long long sum=0;
long long t=1;
for(int i=s.size()-1;i>=0;i--){
if(s[i]>='0'&&s[i]<='9'){
sum+=(s[i]-'0')*t;
}
else if(s[i]>='A'&&s[i]<='Z'){
sum+=(s[i]-'A'+10)t;
}
t=k;
}
return sum;
}
int main(){
string s;
int n,k;
cin>>n;
while(n--){
cin>>k>>s;
cout<<f(k,s)<<endl;
}
}
