FastPrep
Problem · Matrix

Bubble Popping Game

● MediumInstacartFULLTIMEOA

You are given a 2D array grid, where grid[i][j] represents the color of the bubble at position (i, j). You are also given an operations array, which is a sequence of coordinates indicating where to pop bubbles.

Rules:

  • If you pop a bubble at a position with value 0 (meaning no bubble), nothing happens.
  • If you pop a bubble, check its top-left, bottom-left, top-right, and bottom-right diagonal neighbors: If the neighbor is within bounds, has a bubble (non-zero), and the color is the same as the popped bubble, that neighbor also pops.
  • After popping, gravity applies: bubbles above empty cells fall down to fill the empty spaces directly below them.
  • Perform all operations in order and return the final grid.

    • Examples
    01 · Example 1
    grid = [[1, 2, 3], [6, 1, 2], [1, 2, 5]]
operations = [[1, 1], [1, 2]]
return = [[0, 0, 0], [0, 0, 3], [6, 2, 5]]
    Step 1: Pop bubble at (1, 1)
    • Pops the bubble itself
    • Pops diagonally connected bubble (0, 0) because it has the same color 1
    Apply gravity: 
            [
          [0, 0, 3],
          [0, 2, 2],
          [6, 2, 5]
        ]
    Step 2: Pop bubble at (1, 2)
    • Pops the bubble itself
    • Pops diagonal (0, 1) because it's 2
    • Pops diagonal (2, 1) because it's also 2
    Apply gravity: 
            [
          [0, 0, 0],
          [0, 0, 3],
          [6, 2, 5]
        ]
    Final Output: 
            [
          [0, 0, 0],
          [0, 0, 3],
          [6, 2, 5]
        ]
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    public int[][] popBubbles(int[][] grid, int[][] operations) {
  // write your code here
}
    grid[[1, 2, 3], [6, 1, 2], [1, 2, 5]]
    operations[[1, 1], [1, 2]]
    expected[[0, 0, 0], [0, 0, 3], [6, 2, 5]]
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