题解 | #小乐乐改数字#

#include <bitset>
#include <iostream>
#include <vector>
using namespace std;
void cout_bin(int num)//十进制转二进制输出
{
    int a;
    a = num%2;
    num = num >>1;
    if(num==0)
    {
        cout<<a;
    }
    else {
        cout_bin(num);
        cout<<a;
    }
}

int main() {
    int a, b,result=0,num;
    cin >>a;
    while (a!=0) {
        int n=a%10;
        if(n%2==0)
        {
            n=0;
        }
        else {
            n=1;
        }
        result = result | n<< num;
        num++;
        a /=10;
    }   
    cout_bin(result);
}
// 64 位输出请用 printf("%lld")