Leetcode Problem 488. Zuma Game

488. Zuma Game

Leetcode Solutions

Backtracking with Memoization

  1. Define a helper function clean to remove groups of three or more consecutive balls of the same color from the board.
  2. Define a recursive function dfs that takes the current state of the board and the hand as arguments.
  3. If the board is empty, return 0 as no more insertions are needed.
  4. If the hand is empty, return infinity as it's impossible to clear the board.
  5. Iterate over each ball in the hand and each possible insertion position on the board.
  6. Insert the ball into the board and call the clean function to get the new board state.
  7. Recursively call dfs with the new board and the updated hand (with the inserted ball removed).
  8. Take the minimum of the current answer and 1 plus the result of the recursive call.
  9. Use memoization to cache the results of the dfs function to avoid recomputing the same states.
  10. If the minimum answer is infinity, return -1, indicating it's impossible to clear the board; otherwise, return the minimum answer.
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Breadth-First Search (BFS) with Visited State Tracking

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