题解 | #进制转换#

#include <iostream>
#include <string>
using namespace std;

int main() {
    string s;
    cin >> s;
    int len = s.length();
    int sum = 0;
    for( int i  = 2  ; i < len   ; i ++){
        int tmp = 0;
        if( s[i] >= 'A' && s[i] <= 'F' ){
        tmp =  (s[i] - 'A' + 10);
        }else {
            tmp = s[i] - '0';
        }
        sum = sum*16 + tmp ;
        
    }
    cout << sum;
    return 0;
    
}
// 64 位输出请用 printf("%lld")