midStrings
Find the longest palindromic substring.
Updated Apr 28, 2026
Short answer
Expand around center or use DP to check all possible substrings.
Deep explanation
Intermediate string problems test your ability to use frequency maps and sliding windows. Expand around center or use DP to check all possible substrings.
Real-world example
Search filters that ignore character order.
Common mistakes
- Inefficiently sorting strings for an anagram check when a frequency map is O(n).
Follow-up questions
- What is the time complexity of sorting?