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Description: Given a String s, a sub-string is defined as a non-empty string that can be obtained by applying following operation


  1. Remove zero or 1 character from left side of s
  2. Remove zero or 1 character from right side of s
  3. Remove zero or 1 character from left & right side of s
    Find how many distinct sub-string possible.


Characters in string are [a-z]
String length can be up to 10^5





by Expert (110,880 points)
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is there better than trie solution?
by (140 points)

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