#include <string.h>
int lengthOfLongestSubstring(char *s)
{
    char bin[128] = {0};
    unsigned short length = strlen(s);
    unsigned short ret = 0, this_ret = 0;

    for (int i = 0; i < length; i++)
    {
        if (bin[s[i]] != 0)
        {
            if (s[i - this_ret] == s[i])
                continue;
            if (ret < this_ret)
                ret = this_ret;
            while (s[i - this_ret] != s[i]){
                bin[s[i-this_ret]] = 0;
                this_ret --;
            }
        }else{
            bin[s[i]] = 1;
            this_ret++;
        }
    }

    return ret<this_ret?this_ret:ret;
}