leetcode-Length of Last Word
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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:双指针
代码:
int lengthOfLastWord(const char *s) {
int len=strlen(s);
int p=len-1;
while(p>=0 && s[p]==' ')
{
--p;
}
int q=p;
while(q>=0 && s[q]!=' ')
{
--q;
}
return p-q;
}
0 0
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