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Master every Arrays & Strings pattern asked in Google, Meta, Amazon, Apple & Microsoft interviews. Covers prefix sum, Kadane, Dutch flag, two pointers, sliding window and 100 hand-picked problems with C, C++, Java, JavaScript & Python solutions.
Two Sum is the most asked interview problem at Google, Amazon and Meta. Learn every approach from O(n²) brute force to O(n) HashMap with C, C++, Java, JavaScript and Python solutions.
The classic stock problem asked at Amazon, Google and Microsoft. Learn the O(n) greedy "min so far" approach with complete solutions in C, C++, Java, JavaScript and Python, plus extensions to Stock II, III and IV.
Solve Contains Duplicate in O(n) time using a HashSet. Full solutions in C, C++, Java, JavaScript and Python with sorting alternative and follow-up questions asked at Amazon interviews.
Kadane's Algorithm is a must-know pattern for FAANG interviews. Solve Maximum Subarray in O(n) time with full solutions in C, C++, Java, JavaScript and Python, plus divide-and-conquer O(n log n) alternative.