58. Length of Last Word
Easy
Given a string s consisting of words and spaces, return the length of the last word in the string.
A word is a maximal substring1 consisting of non-space characters only.
Example 1:
Input: s = “Hello World”
Output: 5
Explanation: The last word is “World” with length 5.
Example 2:
Input: s = ” fly me to the moon “
Output: 4
Explanation: The last word is “moon” with length 4.
Example 3:
Input: s = “luffy is still joyboy”
Output: 6
Explanation: The last word is “joyboy” with length 6.
Constraints:
1 <= s.length <= 104
s consists of only English letters and spaces .
There will be at least one word in s.
Solution:
/**
* @param String $s
* @return Integer
*/
function lengthOfLastWord($s) {
$length = 0;
for ($i = strlen($s) – 1; $i >= 0; $i–) {
if ($s[$i] == ‘ ‘) {
if ($length) {
break;
}
} else {
$length += 1;
}
}
return $length;
}
}
Substring A substring is a contiguous non-empty sequence of characters within a string. ↩
