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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. 		// your code goes here
  13. 		Scanner sc = new Scanner(System.in);
  14. 		int n = sc.nextInt();
  15. 		int nums[] = new int[n];
  16. 		for(int i=0;i<n; i++){
  17. 			nums[i] = sc.nextInt();
  18. 		}
  19.  
  20. 		HashMap<Integer,Boolean> hmap = new HashMap<>();
  21.  
  22.         for(int k: nums){
  23.             hmap.put(k,true);
  24.         }
  25.         int longestConsecutiveSequence=0;
  26.         for(int num : nums){
  27.             if(hmap.containsKey(num-1))
  28.                 hmap.put(num,false);
  29.         }
  30.  
  31.         for(int num : nums){
  32.  
  33.             if(hmap.get(num)==true){
  34.                 int start=num;
  35.                 int count=0;
  36.                 while(hmap.containsKey(start)){
  37.                     start++;
  38.                     count++;
  39.                 }
  40.                 if(count>longestConsecutiveSequence)
  41.                     longestConsecutiveSequence=count;
  42.             }
  43.         }
  44.         System.out.println(longestConsecutiveSequence);
  45. 	}
  46. }
Success #stdin #stdout 0.12s 56628KB
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https://ideone.com/TeeUNe
language:
Java (HotSpot 12)
created:
12 days ago
visibility:
public

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