LeetCode 75 C++ | Step-by-Step Solutions (LAN Academy) - LeetCode 1926 – Nearest Exit from Entrance in Maze | C++ BFS

In this video we solve LeetCode 1926 – Nearest Exit from Entrance in Maze using Breadth-First Search (BFS) in C++. You are given a grid maze with empty cells and walls, and an entrance position. Your task is to find the **shortest number of steps** from the entrance to the **nearest exit** on the border of the maze – or return -1 if no exit is reachable. What you’ll learn in this video: - How to model a maze as a grid graph - Why BFS is the right tool for shortest paths in an unweighted grid - How to handle visited cells and avoid going out of bounds - How to detect valid exits without counting the entrance as an exit - Time and space complexity analysis We code the full solution in C++, step by step. ⏱️ Timestamps: 00:00 – Problem statement and examples 01:00 – Visualizing the maze as a graph 03:00 – BFS idea for shortest path 05:20 – Implementing BFS in C++ 11:30 – Complexity analysis 12:20 – Edge cases and common mistakes 13:30 – Final recap and next problems This problem is great for practicing: - 2D grid traversal - BFS (Breadth-First Search) - Queue-based shortest path in unweighted graphs Follow LAN Academy Website: https://lanacademy-school.thinkific.com YouTube: @lanacademy9521 Twitter: https://x.com/SolutionsLan If this video helped you: 👍 Like the video 💬 Comment which problem you want next 🔔 Subscribe to the channel for more C++ and algorithms tutorials!