/* Note:Your choice is C IDE */
#include "stdio.h"
void combine_increase(int* arr,int start, int* result, int count, const int NUM, const int arr_len)
{
    int i = 0;
    for (i = start; i < arr_len + 1 - count; i++)
    {
        result[count-1] = i;
        if (count - 1 == 0)
        {
            int j;
            for (j = NUM - 1; j >= 0; j--)
            printf("%d\t",arr[result[j]]);
            printf("\n");
        }
        else
        combine_increase(arr,i + 1, result, count - 1, NUM, arr_len);
    }
}
int main()
{
    int arr[] = {1, 2, 3, 4, 5, 6};
    int num = 4;
    int result[num];
   
    combine_increase(arr, 0, result, num, num, sizeof(arr)/sizeof(int));
    printf("分界线\n");
    /*combine_decrease(arr,sizeof(arr)/sizeof(int),result,num,num);*/
    return 0;
}