leetcode 58. Length of Last Word
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.
Example:
Input: "Hello World"
Output: 5
class Solution {
public int lengthOfLastWord(String s) {
s = s.replaceAll(" +"," ");
if(s.equals(" ")){
return 0;
}
String[] result = s.split(" ");
return result.length();
}
}
利用split方法，效率有点低，继续改进。
class Solution {
public int lengthOfLastWord(String s) {
s = s.trim();
return s.length() - (s.lastIndexOf(" ") +1) ;
}
}
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