Given an integer array nums, move all 0’s to the end of it while maintaining the relative order of the non-zero elements.…
Find the shortest clear path from the top-left to bottom-right of a 0-1 grid. We explain the intuition, walk through…
Need not just distances but the real route? Learn how to extend Dijkstra’s algorithm to reconstruct the shortest path from…
See how to run Dijkstra with a set instead of a heap. We break down the idea, walk through clear…
Learn to implement Dijkstras Algorithm with a Priority Queue using a min-heap (heapq). We cover the problem statement, clear intuition,…
Learn how to find single source shortest path in a weighted directed acyclic graph (DAG) in linear time. We explain…
Find the Shortest Path in an Undirected Graph from a source to every other node when every edge costs 1.…
Learn a one-pass way to check if array is sorted in non-decreasing order. Intuition, commented Python code, dry run, and…
Need the second smallest and second largest in one array? We compare a clear two-pass “better” method with a one-pass…
Quick Sort is a popular sorting algorithm that follows a divide-and-conquer approach. When implemented well, Quick Sort can be extremely…