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
.
思路:指针扫描一次,遇到空格置零。要特别注意多个空格的情况。要判断空格后面是否为空格,或者是指到字符串尾部。
对char *操作时注意一些细节问题。
class Solution {
public:
int lengthOfLastWord(const char *s) {
if(s==NULL)
return 0;
int ret=0;
int flag=0;
while(*s){
if(*s!=' ')
++ret;
if(*s==' '&&*(s+1)&&*(s+1)!=' ')
ret=0;
++s;
}
return ret;
}
};