LeetCode “Spiral Matrix” (#54) asks you to return all the elements of an m × n matrix in clock-wise spiral…
Browsing: Hard
If you’re preparing for coding interviews, the “Set Matrix Zeroes” problem is a must-know! In this blog, we’ll explain the…
Learn to solve “Find the City With the Smallest Number of Neighbors at a Threshold Distance” using Floyd Warshall or…
Bellman Ford Algorithm made easy: learn how to find shortest paths (and detect negatives) with clear intuition, commented Python code,…
Learn how to solve Number of Ways to Arrive at Destination with Dijkstra’s algorithm while counting paths. Clear intuition, commented…
Solve Minimum Multiplications to reach End with a clean BFS, modular math, and commented Python code. Easy steps, dry run,…
Solve “Cheapest Flights Within K Stops” (LeetCode 787) in plain Python using a BFS queue and a cost array. Learn…
Path With Minimum Effort made easy: understand LeetCode 1631 with a Dijkstra heap, 4-way moves, and fully commented Python code…
Learn how to list all “eventual safe” nodes in a directed graph. We use DFS with path-tracking to spot cycles…
We flip the graph, run Kahn’s topological BFS, and list every node guaranteed to avoid cycles. Includes clear intuition, step-by-step…