题解 | #进制转换#

#include <iostream>
#include <cstring>
#include <vector>
using namespace std;
int char2int(char x){
    if(x>='0'&&x<='9') return x-'0';
    else  return x-'A'+10;
}

int main() {
    string hex;
    while(cin>>hex){
        long long num=0;
        for(int i=2;i<hex.length();i++){
            num=num*16+char2int(hex[i]);
        }
        cout<<num<<endl;
    }
}