LeetCode 1706: Where Will the Ball Fall Solution

Master LeetCode problem 1706 (Where Will the Ball Fall), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

1706. Where Will the Ball Fall

Medium

Array Matrix Simulation

Problem Explanation

Explanation:

We can simulate the movement of each ball by following the diagonal boards in the grid.
For each ball dropped from the top, we keep track of its row and column position as it moves down.
We handle the cases where the ball can get stuck or fall out of the box based on the conditions mentioned in the problem description.
We iterate through each column and simulate the movement of the ball to determine its final position.

Time Complexity: O(m * n) Space Complexity: O(n)

Solution Code

class Solution {
    public int[] findBall(int[][] grid) {
        int m = grid.length, n = grid[0].length;
        int[] result = new int[n];
        
        for (int c = 0; c < n; c++) {
            int col = c;
            for (int r = 0; r < m; r++) {
                if (grid[r][col] == 1) {
                    if (col + 1 < n && grid[r][col + 1] == 1) {
                        col++;
                    } else {
                        col = -1;
                        break;
                    }
                } else {
                    if (col - 1 >= 0 && grid[r][col - 1] == -1) {
                        col--;
                    } else {
                        col = -1;
                        break;
                    }
                }
            }
            result[c] = col;
        }
        
        return result;
    }
}

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