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  1. import java.util.*;
  2.  
  3. class Main {
  4.     public static void main(String[] args) {
  5.         int[] arr = {1, 1, 2, 2, 2, 1};
  6.         int maxDistance = 0;
  7.         Map<Integer, Integer> firstIndex = new HashMap<>();
  8.  
  9.         for (int i = 0; i < arr.length; i++) {
  10.             if (!firstIndex.containsKey(arr[i])) {
  11.                 firstIndex.put(arr[i], i);
  12.             } else {
  13.                 maxDistance = Math.max(maxDistance, i - firstIndex.get(arr[i]));
  14.             }
  15.         }
  16.  
  17.         System.out.println(maxDistance);
  18.     }
  19. }
  20.  
Success #stdin #stdout 0.08s 52532KB
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https://ideone.com/uU2Ef0
language:
Java (HotSpot 12)
created:
283 days ago
visibility:
public

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