1. 题目

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.

2.解决方式

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