# 58.Length of Last Word

**58.Length of Last Word**

难度:Easy

> 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.

```
Example:

Input: "Hello World"
Output: 5
```

从后面开始判断，求出最后一个单词的长度。

```
class Solution {
public:
    int lengthOfLastWord(string s) {
        int len=0;
        for(int i=s.length()-1;i>=0;i--)
        {
            if(s[i] == ' '  && len ) break;
            else if(s[i] !=' ') len++; 

        }
        return len;
    }
};
```

> 执行用时 :4 ms, 在所有 C++ 提交中击败了86.57%的用户\
> 内存消耗 :8.7 MB, 在所有 C++ 提交中击败了82.08%的用户