Leetcode Problem 1345. Jump Game IV

1345. Jump Game IV

Leetcode Solutions

Breadth-First Search (BFS) Approach

  1. Initialize a queue and add the first index (0) to it.
  2. Create a visited set to keep track of visited indices.
  3. Construct a graph dictionary that maps each value to a list of indices with that value.
  4. Perform a BFS traversal: a. Dequeue an index from the queue. b. If it's the last index, return the number of steps taken. c. Add the index to the visited set. d. Enqueue the neighboring indices (i+1, i-1) if they are within bounds and not visited. e. Enqueue all indices with the same value as the current index from the graph and clear the list in the dictionary.
  5. If the queue becomes empty, return -1 as it's not possible to reach the last index.
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Bidirectional Breadth-First Search (BFS) Approach

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