面试过的问题

京东编程：找幸运数

#include <iostream>
using namespace std;

int f(int x)
{
    int sum = 0;
    while (x != 0)
    {
        sum += x % 10;
        x /= 10;
    }
    return sum;
}

int g(int x)
{
    int sum = 0;
    int flag = 1;
    while (flag)
    {
        if (flag&x)
            sum++;
        flag = flag << 1;
    }
    return sum;
}

int main()
{
    int n;
    cin >> n;
    int *p = new int[n];
    for (int i = 0; i < n; i++)
    {
        cin >> p[i];
    }
    for (int i = 0; i < n; i++)
    {
        int count = 0;
        for (int j = 1; j <= p[i]; j++)
        {
            if (f(j) == g(j))
                count++;
        }
        cout << count << endl;
    }
    system("pause");
    return 0;
}

View Code