算法学习之字符串包含

#include <stdio.h>
#include <stdlib.h>
#define  MAX   50
int is_contain(const char *str1,const char *str2)
{
    long long tmp1 = 0,tmp2 = 0;//前64位放进tmp1,后64位放进tmp2;
    int i = 0,n;
    while(str1[i])
    {
        n = str1[i++] - '\0';
        if(n < 63)
            tmp1 |= 1<<n;
        else
            tmp2 |= 1<<(n%64);
    }
    i = 0;
    while(str2[i])
    {
         n = str2[i++] - '\0';
        if(n < 63)
        {
            if(!((1<<n)&tmp1))
                return 0;
        }
        else
        {
            if(!((1<<(n%64)&tmp2)))
                return 0;
        }
    }
    return 1;
}
int main()
{
    char str1[MAX],str2[MAX];
    scanf("%s %s",str1,str2);
    if(is_contain(str1,str2))
        printf("str1 contain str2\n");
    else
        printf("str1 does't contain str2");
    return 0;
}