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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. 	//abcabcdbd 
  11. 	//Sliding window solution Time: O(n), Space: O(1)
  12.  
  13. 	public static void main (String[] args) throws java.lang.Exception
  14. 	{
  15. 		System.out.println(getLongestStringWithoutRepetitions("abcabcdbd"));
  16. 		System.out.println(getLongestStringWithoutRepetitions(""));
  17. 		System.out.println(getLongestStringWithoutRepetitions("aaabbb"));
  18. 		System.out.println(getLongestStringWithoutRepetitions("aaa"));
  19. 		System.out.println(getLongestStringWithoutRepetitions("abc"));
  20. 		System.out.println(getLongestStringWithoutRepetitions("abbcdecb"));
  21. 	}
  22.  
  23. 	private static int getLongestStringWithoutRepetitions(String input) {
  24. 		int start=0, end=0, result=0;
  25. 		int[] count = new int[26];
  26. 		while(end<input.length()) {
  27. 			count[(int)(input.charAt(end)-'a')]++;
  28. 			if(count[(int)(input.charAt(end)-'a')]>1) {
  29. 				while(start<=end) {
  30. 					start++;
  31. 					count[(int)(input.charAt(start-1)-'a')]--;
  32.  
  33. 					if(count[(int)(input.charAt(start-1)-'a')]==1) {
  34. 						break;
  35. 					}
  36. 				}
  37. 			}
  38. 			result = Math.max(result, end-start+1);
  39. 			end++;
  40. 		}
  41. 		return result;
  42. 	}
  43. }
Success #stdin #stdout 0.09s 54680KB
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https://ideone.com/XfaB12
language:
Java (HotSpot 12)
created:
7 days ago
visibility:
public

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