René's URL Explorer Experiment

Title: Coding Interview Patterns: 14 Most-Asked DSA Patterns | LeakCode

Open Graph Title: Coding Interview Patterns: 14 Most-Asked DSA Patterns | LeakCode

X Title: Coding Interview Patterns: 14 Most-Asked DSA Patterns | LeakCode

Description: The 14 coding patterns that cover 90% of interview questions: two pointer, sliding window, binary search, DP, BFS/DFS, monotonic stack, and more. Templates, complexity, and classic problems.

Open Graph Description: The 14 coding patterns that cover 90% of interview questions: two pointer, sliding window, binary search, DP, BFS/DFS, monotonic stack, and more. Templates, complexity, and classic problems.

X Description: The 14 coding patterns that cover 90% of interview questions: two pointer, sliding window, binary search, DP, BFS/DFS, monotonic stack, and more. Templates, complexity, and classic problems.

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Links:

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Two Pointer When you see a sorted array or a linked list problem with pair/triplet semantics, two pointers is almost always the right tool. 7 classic problems	https://leakcode.dev/patterns/two-pointer
Sliding Window Substring and subarray problems with a contiguous-range constraint collapse to O(n) via two pointers that only expand. 7 classic problems	https://leakcode.dev/patterns/sliding-window
Binary Search Not just for sorted arrays. Binary search the answer space when the predicate is monotonic and the bounds are integer. 7 classic problems	https://leakcode.dev/patterns/binary-search
Monotonic Stack Next-greater, next-smaller, and span problems are all the same pattern with the same O(n) stack invariant. 7 classic problems	https://leakcode.dev/patterns/monotonic-stack
Fast and Slow Pointer Floyd's tortoise and hare: detect cycles, find middle, and reverse-with-finds in O(1) extra space on linked lists. 7 classic problems	https://leakcode.dev/patterns/fast-and-slow-pointer
Merge Intervals Any 'overlapping ranges' problem sorts by start, then sweeps left-to-right with a single accumulator. 7 classic problems	https://leakcode.dev/patterns/merge-intervals
Topological Sort Dependency ordering on a DAG: Kahn's BFS or DFS post-order, both O(V+E). 7 classic problems	https://leakcode.dev/patterns/topological-sort
Union Find Connected components, redundancy detection, and Kruskal's MST all reduce to find + union with path compression. 7 classic problems	https://leakcode.dev/patterns/union-find
Backtracking Permutations, combinations, partitions, and constraint-satisfaction problems share the same recursive shape. 9 classic problems	https://leakcode.dev/patterns/backtracking
Dynamic Programming DP is recognition: identify the state, the transition, and the order. The rest is implementation. 9 classic problems	https://leakcode.dev/patterns/dynamic-programming
Graph BFS Shortest path in unweighted graphs, level-order traversal, and multi-source spreading all use the same queue loop. 7 classic problems	https://leakcode.dev/patterns/graph-bfs
Graph DFS Cycle detection, connected components, and most tree-recursion variants use DFS with three states. 7 classic problems	https://leakcode.dev/patterns/graph-dfs
Prefix Sum Range sum queries collapse from O(n) per query to O(1) with one precomputation pass. 7 classic problems	https://leakcode.dev/patterns/prefix-sum
Heap / Top K Elements K-th largest, K closest points, and merge-K-streams problems all collapse to a size-K heap. 7 classic problems	https://leakcode.dev/patterns/heap-top-k
System design problems	https://leakcode.dev/system-design
All DP questions	https://leakcode.dev/topic/dynamic-programming-interview-questions
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FAANG Interview Prep	https://leakcode.dev/guides/faang-interview-prep
Behavioral Questions	https://leakcode.dev/guides/behavioral-questions
Salary Negotiation	https://leakcode.dev/guides/salary-negotiation
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