fork download
copy 
  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.  
  22.  
  23.             int result = maxLength(arr);
  24.             System.out.println(result);
  25.  
  26.  
  27. 	}
  28. 	public static int maxLength(int arr[]) {
  29.         HashMap<Integer, Integer> present = new HashMap<>();
  30.  
  31.         int n = arr.length;
  32.         int[] prefixSum = new int[n];
  33.         int sum = 0;
  34.  
  35.  
  36.         for (int i = 0; i < n; i++) {
  37.             sum += arr[i];
  38.             prefixSum[i] = sum; 
  39.         }
  40.         present.put(0, -1);
  41.         int maxLongestSubArray = 0;
  42.  
  43.  
  44.         for (int i = 0; i < n; i++) {
  45.             int num = prefixSum[i];
  46.  
  47.  
  48.             if (num == 0) {
  49.                 maxLongestSubArray = Math.max(maxLongestSubArray, i + 1);
  50.             }
  51.  
  52.  
  53.             if (present.containsKey(num)) {
  54.                 int currentLongestSubArray = i - present.get(num);
  55.                 maxLongestSubArray = Math.max(currentLongestSubArray, maxLongestSubArray);
  56.             } else {
  57.  
  58.                 present.put(num, i);
  59.             }
  60.         }
  61.  
  62.         return maxLongestSubArray;
  63.     }
  64. }
Success #stdin #stdout 0.11s 56532KB
comments (?)
stdin
copy 
5
2 -2 4 0 -4
stdout
copy 
5
https://ideone.com/Io4y4f
language:
Java (HotSpot 12)
created:
3 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!