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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. 		// store unique char in set
  14. 		String s = "pqpqs";
  15. 		int k = 2;
  16. 		int n = s.length();
  17.         Set<Character> set = new HashSet<>();
  18.         long count = 0;
  19. 		HashMap<Character, Integer> mp =new HashMap<>();
  20. 		for(int i=0, j=0; j<n; j++){
  21. 			mp.put(s.charAt(j), mp.getOrDefault(s.charAt(j), 0) +1);
  22. 			// reduce wndow of pointer if count>k
  23. 			while(mp.size() > k){
  24. 				mp.put(s.charAt(i), mp.getOrDefault(s.charAt(i), 0) - 1);
  25. 				if(mp.get(s.charAt(i))==0){
  26. 					mp.remove(s.charAt(i)); // if freq 0 then remove it
  27. 				}
  28. 				i++; // move pointer toward right
  29. 			}
  30. 			// all subarrays ending at j are valid
  31. 			count+=(j - i+1);
  32.         }
  33.         System.out.print(count);
  34. 	}
  35. }
Success #stdin #stdout 0.1s 54580KB
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12
https://ideone.com/nml9tC
language:
Java (HotSpot 12)
created:
1 day ago
visibility:
public

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