C++ 代码

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

int main()
{
    int n;
    cin >> n;
    int res = 0;
    if(n >= 1024) res = 0;
    vector<int> a{64, 16, 4, 1};
    n = 1024 - n;
    for(int i = 0; i < 4; i++)
    {
        int temp = n / a[i];
        if(temp >= 0)
        {
            res += temp;
            n = n - temp * a[i]; 
        }
        else{
            break;
        }
    }
    cout<<res<<endl;
    return 0;
}