#include <string.h>

#include <stdio.h>

#include <stdlib.h>

void combine(char *value,char *result,int m)

{

    if(m == )

    {

        while(*value != '\0')

        {

            printf("%s%c\n",result,*value);

            value++;

        }

    }

    int value_len = strlen(value);

    int result_len =  strlen(result);

    int i = ;

    for(i = ;i < value_len - m + ;i++)

    {

        result[result_len] = *value;

        result[result_len + ] = '\0';

        value++;

        combine(value,result,m - );

    }

}

int main()

{

    printf("输入字符集：\n");

    char value[];

    scanf("%s",value);

    printf("输入组合的数字：\n");

    int m;

    scanf("%d",&m);

    char *result = (char *)malloc(m + );

    memset(result,,m + );

    combine(value,result,m);

    return ;

}