Create 1312-Minimum-Insertion-Steps-to-Make-a-String-Palindrome.py #4342
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Description:
This PR adds a solution to LeetCode Problem 1312 using a top-down dynamic programming approach with memoization.The goal is to return the minimum number of insertions required to make the input string a palindrome.
Approach:
We use recursion with memoization (top-down DP) to avoid redundant computations.
The key idea:
If characters at both ends match, move inward.
Else, insert one character and recursively solve for both possible substrings (excluding one character from either end), and take the minimum.