Given an input string s, reverse the order of the words.
A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.
Return a string of the words in reverse order concatenated by a single space.
Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.
Example 1:
Input: s = "the sky is blue"
Output: "blue is sky the"
class Solution {
public String reverseWords(String s) {
int n = s.length();
StringBuilder ans = new StringBuilder("");
StringBuilder temp = new StringBuilder("");
for( int i=n-1; i>=0; i-- ) {
char ch = s.charAt(i);
if( ch!=' ' ) temp.append(ch);
if( (ch==' ' || i==0 ) && temp.length()>0 ) {
if( ans.length()>0 ) ans.append(" ");
temp.reverse();
ans.append(temp);
temp.setLength(0);
}
}
return ans.toString();
}
}
