1930. Unique Length-3 Palindromic Subsequences | Leetcode Daily (POTD) 4 Jan 2024 | Java | Hindi
"1930. Unique Length-3 Palindromic Subsequences" is a medium-level problem and the LeetCode daily challenge (POTD) for 4 January 2024. The solution, written in Java, is explained with a dry-run on a blackboard, making it accessible to viewers with diverse programming backgrounds by focusing on the logic rather than language-specific details.
Intuition:
To identify unique length-3 palindromic subsequences, determine the first and last occurrence of each character in the string. Between these two positions, count the distinct characters that can serve as the middle character of the palindrome. The count of these unique middle characters represents the number of distinct palindromes that can be formed with the given character as the two ends. By repeating this for every character, we can efficiently compute the total number of unique palindromic subsequences.
Link to the problem: https://leetcode.com/problems/unique-...
Link to the Java Code: https://github.com/AditiChourasia/Lee...
For doubts/queries, please reach out on [email protected]
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