题解 | #进制转换#

import java.util.Scanner;

public class Main{

public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    while(sc.hasNext()){
        String str = sc.nextLine();
        String num = str.substring(2,str.length());
        int result = 0;
        int power = 1;
        for(int i = num.length() - 1; i >= 0; i--){
            char c = num.charAt(i);
            if(c >= '0' && c <= '9'){
                result += (c - '0') * power;
            }else if (c >= 'A' && c <= 'F'){
                result += (c - 'A' + 10) * power;
            }
            power *= 16;
        }
        System.out.println(result);
    }
    sc.close();
}

}