String
String manipulation and algorithms are among the most common interview questions. Master pattern matching, palindrome detection, substring search, and string transformation techniques.
Essential Algorithms:
Pattern matching: KMP, Rabin-Karp, Boyer-Moore
Palindromes: Manacher’s algorithm, expand around center
Substring: Longest common substring, sliding window
Manipulation: Reversal, permutations, anagrams
Common Patterns:
Two-pointer technique for palindromes and reversal
Sliding window for substring problems
Hash maps for anagrams and frequency counting
Dynamic programming for edit distance
Interview Frequency: Very high. String questions appear in 40%+ of interviews across all companies.