webcoderspeed.com
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.
Browse by topic
Advertisement
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.
Move all zeroes to end while maintaining relative order of non-zero elements. Optimal O(n) two-pointer solution with minimal writes. Full C, C++, Java, JavaScript and Python code.
Increment a large integer represented as an array by one. Learn the carry propagation pattern with O(n) solutions in C, C++, Java, JavaScript and Python.
Merge two sorted arrays in-place by filling from the end. The classic 3-pointer technique asked at Meta and Microsoft. Full solutions in C, C++, Java, JavaScript and Python.
Remove duplicates from a sorted array in-place using the write pointer pattern. O(n) time, O(1) space. Full solutions in C, C++, Java, JavaScript, Python with follow-up for allowing k duplicates.
Join engineers getting weekly deep-dives on system design, AI engineering, and backend patterns. No spam — unsubscribe anytime.