Скачать или смотреть Snakes and Ladders Leetcode | Leetcode 909 | Simple BFS | Leetcode POTD

Snakes and Ladders Leetcode | Leetcode 909 | Simple BFS | Leetcode POTD


🚀 Approach Overview:
We start from cell 1 and explore all possible moves using a queue (BFS)
Use a HashSet to track visited cells
Handle ladders and snakes using board values
Track steps level by level to get the minimum number of dice rolls
Use a helper function to convert cell numbers to coordinates considering zigzag order

Initialize BFS:

Start from cell 1.
Use a queue to store positions to explore.
Use a HashSet called visited to avoid visiting the same cell multiple times.

Run BFS:
While the queue is not empty:
For each element in the queue (each level of BFS), check all dice moves from 1 to 6.

For each move:
If the new cell goes beyond n * n (last cell), skip it.
Calculate the board coordinates using a helper method getCoordinates.
If there's a ladder or snake (i.e., board[row][col] != -1), move to that destination.
If the destination is not visited, add it to the queue and mark as visited.

Track Steps:
After processing each level of BFS (one dice roll), increment the step count.
If the destination cell n * n is reached, return the number of steps.
If no path leads to the end, return -1.


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