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Reverse Words in a String
Reverse Words in a String
Given an input string, reverse the string word by word.
For example,
Given s = "the sky is blue",
return "blue is sky the".
Clarification:
- What constitutes a word?
A sequence of non-space characters constitutes a word. - Could the input string contain leading or trailing spaces?
Yes. However, your reversed string should not contain leading or trailing spaces. - How about multiple spaces between two words?
Reduce them to a single space in the reversed string.
答案
public class Solution {
public void reverseWords(char[] array, int startIndex, int endIndex) {
while (startIndex < endIndex) {
char p = array[startIndex];
array[startIndex] = array[endIndex];
array[endIndex] = p;
startIndex++;
endIndex--;
}
}
public String reverseWords(String s) {
if(s==null)
return null;
s=s.trim();
if(s.length()==0)
return s;
StringBuilder pString=new StringBuilder(s.length());
pString.append(s.charAt(0));
for(int i=1;i<s.length();i++){
pString.append(s.charAt(i));
if(s.charAt(i)==' '){
while(s.charAt(i)==' ')
i++;
i--;
}
}
char[] array = pString.toString().toCharArray();
reverseWords(array, 0, array.length - 1);
int startIndex = 0;
int endIndex;
while (startIndex<array.length) {
for (endIndex = startIndex + 1; endIndex < array.length; endIndex++) {
if (array[endIndex] == ' ')
break;
}
reverseWords(array,startIndex,endIndex-1);
startIndex=endIndex+1;
}
return new String(array);
}
}Reverse Words in a String
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