Length of Last Word

java String api很强大O(∩_∩)O~

public class Solution {     public int lengthOfLastWord(String s) {          if(s == null){              return 0;          }          String[] arrayStrings = s.split(" ");          if(arrayStrings.length == 0){              return 0;          }          return arrayStrings[arrayStrings.length - 1].length();      }}

分析，注意s=" a  b  "这种情况，从后遍历单词，遇到空格退出

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