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Java-based LeetCode algorithm problem solutions, regularly updated
214\. Shortest Palindrome
Hard
You are given a string `s`. You can convert `s` to a palindrome by adding characters in front of it.
Return _the shortest palindrome you can find by performing this transformation_.
**Example 1:**
**Input:** s = "aacecaaa"
**Output:** "aaacecaaa"
**Example 2:**
**Input:** s = "abcd"
**Output:** "dcbabcd"
**Constraints:**
* 0 <= s.length <= 5 * 104
* `s` consists of lowercase English letters only.