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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. 		String s=sc.next();
  14. 		int N=sc.nextInt();
  15. 		int si=0,ei=0,maxlen=0;
  16. 		HashSet<Character> arr=new HashSet<>();
  17. 		while(ei<N){
  18. 			char ch=s.charAt(ei);
  19. 			if(arr.contains(ch)){
  20. 				while(s.charAt(si)!=ch){
  21. 					arr.remove(s.charAt(si));
  22. 					si++;
  23. 				}
  24. 				arr.remove(s.charAt(si));
  25. 				si++;
  26. 			}
  27.  
  28. 			arr.add(s.charAt(ei));
  29. 			maxlen=Math.max(maxlen,arr.size());
  30. 			ei++;
  31. 		}
  32. 		System.out.println(maxlen);
  33. 	}
  34. }
Success #stdin #stdout 0.11s 56756KB
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stdin
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abcdef
6
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6
https://ideone.com/z8xCHN
language:
Java (HotSpot 12)
created:
5 days ago
visibility:
public

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