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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. 		Scanner sc = new Scanner(System.in);
  13. 		int size = sc.nextInt();
  14.  
  15. 		int[] arr =new int[size];
  16.  
  17. 		for(int i = 0;i<size;i++){
  18. 			arr[i] = sc.nextInt();
  19. 		}
  20.  
  21. 		int result = maxLen(arr);
  22.         System.out.println(result);
  23.  
  24. 	}
  25. 	public static int maxLen(int[] arr) {
  26.  
  27.         HashMap<Integer, Integer> present = new HashMap<>();
  28.  
  29.         present.put(0, -1); 
  30.  
  31.         int sum = 0;
  32.         int maxLongestSubArray = 0;
  33.  
  34.         for (int i = 0; i < arr.length; i++) {
  35.  
  36.             sum += (arr[i] == 0) ? -1 : 1;
  37.  
  38.             if (present.containsKey(sum)) {
  39.                 int currentLongestSubArray = i - present.get(sum);
  40.                 maxLongestSubArray = Math.max(currentLongestSubArray, maxLongestSubArray);
  41.             } else {
  42.                 present.put(sum, i);
  43.             }
  44.         }
  45.  
  46.         return maxLongestSubArray;
  47.     }
  48. }
Success #stdin #stdout 0.1s 54488KB
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https://ideone.com/6bIA9p
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

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