› Longest Palindrome — Recursive + Memoized O(n²)

Step through recursive palindrome checks with a memo table (using nullable Boolean). Watch how cached results short-circuit repeated subproblems.

0 / 0
substring
comparing
match
mismatch
memo hit
Recursion stack
Memo table — null = unvisited
Current substring
—
Best palindrome
—
Memo hits
0
← prev   → next   Space play/pause   R reset   S skip to match