题解 | #进制转换#

#include<iostream>
#include<string>
using namespace std;
int main(){
    string s;
    while(cin>>s){
        long long ans=0;
        for(int i=2;i<s.size();i++){
            int x;
            if(s[i]>='a'&&s[i]<='f')x=s[i]-'a'+10;
            else if(s[i]>='A'&&s[i]<='F')x=s[i]-'A'+10;
            else x=s[i]-'0';
            ans=ans*16+x;
        }
        printf("%lld\n",ans);
    }
    return 0;
}