3342. Find Minimum Time to Reach Last Room II | Leetcode Daily - Python

Dive deep into LeetCode 3342: 'Find Minimum Time to Reach Last Room II'! This video provides a comprehensive walkthrough of this challenging grid traversal problem. We'll unravel the complexities of `moveTime` constraints (the earliest you can start moving towards a room) and the alternating movement costs (1 second for the first move, 2 seconds for the second, 1 for the third, and so on). Learn how to apply Dijkstra's algorithm effectively by defining a state that includes arrival time, current room, and the number of moves made so far to handle the varying costs. We'll break down the Python code step-by-step, explaining the initialization, the main Dijkstra loop, how to explore neighbors, and the crucial logic for calculating when you can initiate a move and when you'll arrive at the next room. Finally, we'll discuss the time and space complexity of the solution, along with key takeaways to help you master this type of graph problem.

Perfect for coding interview preparation and improving problem-solving skills.

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