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Leetcode Problem 214. Shortest Palindrome

214. Shortest Palindrome

Leetcode Solutions

Approach # KMP (Knuth–Morris–Pratt)

  1. Reverse the original string s to get rev_s.
  2. Concatenate s, #, and rev_s to form new_s.
  3. Initialize an array f with the same length as new_s to store the failure function.
  4. Iterate through new_s to build the failure function f.
  5. Use the last value in f to determine the length of the longest palindromic prefix.
  6. Append the reverse of the remaining suffix to the front of s to form the shortest palindrome.
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Approach # Brute Force

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