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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		System.out.println (Ideone.valid("(){}[]"));
  13. 		System.out.println (Ideone.valid("(}"));
  14. 		System.out.println (Ideone.valid("[(])"));
  15. 		System.out.println (Ideone.valid("([{}])"));
  16. 	}
  17.  
  18. 	public static boolean valid(String braces)
  19. 	{
  20. 		StringBuilder validateString = new StringBuilder();  //No deque found
  21. 	    for (int i = 0; i < braces.length(); i++){
  22. 	    	char c = braces.charAt(i);        
  23. 	        int head = validateString.length()-1;
  24.  
  25. 	        char top = head > 0 ? validateString.charAt(head) : '\u0000';
  26.  
  27. 	        if (top == c) {
  28. 	           validateString.deleteCharAt(head);
  29. 	        }else {
  30. 	           validateString.append(c);
  31. 	        }
  32. 	        System.out.println (validateString.toString());
  33. 	     }
  34.     	return validateString.length() == 0;
  35. 	}
  36. }
Success #stdin #stdout 0.12s 320576KB
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Standard input is empty
stdout
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(
()
(){
(){}
(){}[
(){}[]
false
(
(}
false
[
[(
[(]
[(])
false
(
([
([{
([{}
([{}]
([{}])
false
https://ideone.com/1UJCRX
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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