Algorithms

⏱ 6 min read Two Pointers and Sliding Window Interview Patterns Two pointers and sliding window are techniques that turn O(n²) brute-force solutions into […] Read article

⏱ 6 min read Graph Algorithm Interview Patterns: BFS, DFS, Dijkstra, Topological Sort Graph problems are a staple of coding interviews. The key is Read article

⏱ 5 min read Segment Tree and Range Query Interview Patterns Segment trees solve range query problems — finding the sum, min, max, or Read article

⏱ 6 min read Trie and String Matching Interview Patterns Tries (prefix trees) and string matching algorithms are a distinct category in coding interviews. Read article

⏱ 5 min read Amortized Analysis and Time Complexity Patterns Amortized analysis evaluates the average performance of operations over a sequence, not worst-case per Read article

⏱ 4 min read Minimum Spanning Tree: Kruskal’s and Prim’s Algorithms A Minimum Spanning Tree (MST) connects all vertices of a weighted graph with Read article

⏱ 4 min read Dynamic Programming Patterns II: Knapsack, LCS, Edit Distance Beyond simple memoization, there are classic DP problem families where recognizing the Read article

⏱ 5 min read Object-Oriented Design (OOD) Interview Patterns: LRU Cache, Parking Lot & More OOD interviews ask you to design a system using Read article

⏱ 5 min read Recursion and Backtracking Interview Patterns Backtracking is systematic exhaustive search with pruning. It builds candidates incrementally and abandons (backtracks) as Read article

⏱ 4 min read String Interview Patterns: Anagram, Palindrome, KMP & More String problems are among the most common in coding interviews. Beyond brute-force Read article

⏱ 4 min read Interval Problem Patterns: Merge, Insert, Overlap & Scheduling Interval problems require manipulating ranges [start, end]. They appear frequently in meeting Read article

⏱ 5 min read Tree Dynamic Programming Interview Patterns Tree DP combines tree traversal with dynamic programming. The key insight: the answer for a Read article

⏱ 5 min read Stack Interview Patterns: Parentheses, Calculator, Histogram & More Beyond the monotonic stack, there are several classic stack patterns that appear Read article

⏱ 4 min read Advanced Binary Search Interview Patterns Binary search goes far beyond searching a sorted array. The key insight: whenever you can Read article

⏱ 4 min read Two Pointers and Sliding Window Interview Patterns Two-pointer techniques transform O(n²) brute-force solutions into O(n) elegant ones. They are among Read article