LeetCode Length of Last Word 最后一个字的长度

 1 class Solution {
 2 public:
 3     int lengthOfLastWord(const char *s) {
 4         if(s=="")    return 0;
 5         string snew=s;
 6         int n=0,len=strlen(s);
 7         char *p=&snew[len-1];
 8         while(*p==‘ ‘&&len!=0){
 9             *p--;
10             len--;
11         }
12         while(*p!=‘ ‘&&len!=0){
13             n++;
14             p--;
15             len--;
16         }
17         return n;
18     }
19 };

题意:给一个数组,以空格来判断是否字的结束与开始。一个词的前后都是空格,中间无空格。返回最后一个字的长度。

思路:给的是一个不可修改的字符串,为了方便,创建另外的指针。若最后是空格,先将后面的空格过滤,从后开始寻找第一个不是空格的字符,开始计数,继续往前数,直到有空格或者已经扫完字符串为止。

吐槽:感觉snew可以省略的,直接利用s就行。但是语法忘了~

时间: 2024-12-28 17:59:11

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