[LeetCode] Length of Last Word

Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string.

If the last word does not exist, return 0.

Note: A word is defined as a character sequence consists of non-space characters only.

For example, 
Given s = "Hello World",
return 5.

这题看似很简单，本来想睡前切一道怡情，结果切到一点钟，东改西改还是没AC....

因为edge case 很多，考虑一不周全就是错的，比如 "", " ", " a", " a", "a     b     " 这几个case。

最后我AC的思路是用 i 来记录当前的词长，如果遇到空格则说明此词完毕，把 j = i; i = 0 然后继续直到串尾巴''

最后判断 i 是否为0，如果是则返回j，否则返回i

int lengthOfLastWord(const char *s) {
    int i=0, j=0;
    while (*s != '') {
        if (*s == ' ') {
            if (i != 0){
                j = i;
                i = 0;
            }
        }
        else {
            i++;
        }
        s++;
    }
    if (i == 0 ) return j;
    return i;
}

囧