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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. import java.util.Stack;
  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) {
  11.         String input = "}{";
  12.         Stack<Character> stk=new Stack<>();
  13.         char c1; char c2;
  14.         int c=0;
  15.         int l=input.length();
  16.         for (int i = 0; i < l; i++) {
  17.             if (input.charAt(i) == '{') {
  18.                 stk.push(input.charAt(i));
  19.             }
  20.             if (input.charAt(i) == '}') {
  21.                 if (stk.isEmpty()) {
  22.                     stk.push(input.charAt(i));
  23.                 } else if (stk.peek() == '{') {
  24.                     stk.pop();
  25.                 } else if (stk.peek() == '}') {
  26.                     stk.push(input.charAt(i));
  27.                 }
  28.             }
  29.  
  30.         }
  31.         System.out.println(stk.size());
  32.     }
  33. }
Success #stdin #stdout 0.06s 32580KB
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https://ideone.com/53w5fI
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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