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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 int maxLengthSubstring(String s){
  11. 		int length = s.length();
  12. 		Map<Character, Integer> mp = new HashMap<>();
  13. 		int start = 0;
  14. 		int end = 0;
  15. 		int ans = 0;
  16. 		if(length == 0 || length == 1){
  17. 			return length;
  18. 		}
  19. 		while(end < length){
  20. 			char r = s.charAt(end);
  21. 			if(mp.containsKey(r) && start <= mp.get(r)){
  22. 				start = mp.get(r)+1;
  23. 			}
  24. 			mp.put(r,end);
  25. 			ans = Math.max(ans, end - start+1);
  26. 			end++;
  27. 		}
  28. 		return ans;
  29. 	}
  30. 	public static void main (String[] args) throws java.lang.Exception
  31. 	{
  32. 		System.out.println(Ideone.maxLengthSubstring("abcd"));
  33. 		System.out.println(Ideone.maxLengthSubstring("abcba"));
  34. 	}
  35. }
Success #stdin #stdout 0.08s 47124KB
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https://ideone.com/I8Cwx2
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
public

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