题解 | 进制转换

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

int main() {
    string s ;
    while (cin >> s) {
        int bit = 0, number = 0;
        for (int i = s.size() - 1; i > 1; --i) {
            if (s[i] >= '0' && s[i] <= '9') {
                number = number + (s[i] - '0') * pow(16, bit);
                ++bit;
            } else if (s[i] >= 'A' && s[i] <= 'Z') {
                number = number + (s[i] - 'A' + 10) * pow(16, bit);
                ++bit;
            }
        }
        cout << number;
    }
    return 0;
}