A29795.蒙圈游戏

先上代码：

#include<bits/stdc++.h>
using namespace std;
int main() {
    string s;
    cin >> s;
    cout << stoi(s, nullptr, 2) << endl;
    cout << stoi(s, nullptr, 8) << endl;
    cout << stoi(s, nullptr, 16) << endl;
    return 0;
}

不懂stoi()用法的点这里->here