【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.

 

class Solution {
public:
    int lengthOfLastWord(const char *s) {
        int n=strlen(s);
        int i=0;
        int cnt=0;
        //i=n;
        while(s[n-1]==' ')
            n--;
            
        for(i=n-1;i>=0;i--)
        {
            if(s[i]!=' ')
                cnt++;
            else
                break;
                
        }
        return cnt;
    }
    
};