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Common Patterns

In-depth engineering guides and resources.

Modified Binary Search: Mental Models & Boundary Patterns

Master modified binary search patterns for coding interviews. Learn monotonic predicates, lower/upper bounds, rotated arrays, and binary search on answer.

#Monotonic Predicate#Modified Binary#Binary Search#Rotated Array
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Mastering Cyclic Sort: A Powerful Algorithm Technique

Master Cyclic Sort in O(N) time and O(1) space. Learn to solve missing numbers, find duplicates, and handle bounded array ranges.

#Cyclic Sort#Array Sorting#In-Place Sorting#Coding Interview
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Fast and Slow Pointers: Cycle Detection & Invariants

Master Floyd's cycle detection algorithm. Understand pointer mechanics for linked list middle nodes, cycle entry points, and O(1) space optimizations.

#Fast and#Floyd Cycle#Hare and#Linked List
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In-Place Reversal of a Linked List

Learn in-place reversal of linked lists with O(1) memory. Step-by-step pointer manipulation for full lists, sub-lists, and k-groups.

#In-Place Reversal#Reverse Linked#Linked List#Data Structure
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K-Way Merge Pattern: Heaps, Streams & External Sorting

Master the K-Way Merge algorithm using Min-Heaps. Learn to merge K sorted lists in O(N log K) time, solve matrix queries, and understand external sorting.

#K-Way Merge#Priority Queue#External Sorting#Stream Processing
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0/1 Knapsack: Dynamic Programming & Space Optimization

Master the 0/1 Knapsack dynamic programming pattern. Learn the mathematical recurrence, 1D array space optimization, and common interview reductions.

#0/1 Knapsack#Subset Sum#Dynamic Programming#DP Space
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Merge Intervals

Master the Merge Intervals pattern. Learn interval sorting, overlapping range detection, insertion, and boundary conflict resolution.

#Overlapping Intervals#Array Manipulation#Merge Intervals#Algorithmic Coding
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Sliding Window Pattern: Fixed & Dynamic Window Mastery

Master fixed and dynamic sliding window patterns in O(N) time. Learn subarray optimizations, frequency maps, and minimum window substring solutions.

#Subarray Sum#Longest Substring#Amortized O(N)#Sliding Window
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The Subsets Algorithm Technique

Generate subsets, permutations, and combinations using BFS and Backtracking with complete decision tree walkthroughs.

#Subsets Algorithm#Combinatorial Algorithms#Backtracking Patterns#Power Set
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Top 'K' Elements Technique

Master Top K Elements using Min-Heaps and Max-Heaps. Learn QuickSelect partitioning and stream ranking algorithms in O(N log K).

#Top K#Heap Algorithm#Priority Queue#Finding Largest
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