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  1.  import java.io.*;
  2.  import java.util.*;
  3.  class ReverseStringPreserveSpace {  
  4.     static void reverseString(String input) {  
  5.  
  6.         char[] inputArray = input.toCharArray();  
  7.         char[] result = new char[inputArray.length];  
  8.  
  9.         for (int i = 0; i < inputArray.length; i++) {  
  10.             if (inputArray[i] == ' ') {  
  11.                 result[i] = ' ';  
  12.             }  
  13.         }  
  14.  
  15.         int j = result.length - 1;  
  16.  
  17.         for (int i = 0; i < inputArray.length; i++) {  
  18.             if (inputArray[i] != ' ') {  
  19.                 if (result[j] == ' ') {  
  20.                     j--;  
  21.                 }  
  22.                 result[j] = inputArray[i];  
  23.                 j--;  
  24.             }  
  25.         }  
  26.         System.out.println(input + " --> " + String.valueOf(result));  
  27.     }  
  28.  
  29.     public static void main(String[] args) {  
  30.     	Scanner sc=new Scanner(System.in);
  31.     	int t=sc.nextInt();
  32.     	while(t>0){
  33.  
  34.         reverseString(sc.nextLine()); 
  35.         t--;
  36.     	}
  37.     }  
  38. }
Success #stdin #stdout 0.15s 48108KB
comments (?)
stdin
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2
a b c d
String answer
stdout
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 --> 
a b c d --> d c b a
https://ideone.com/ubxSP6
language:
Java (HotSpot 12)
created:
2 years ago
visibility:
public

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