![\"\"](\"https://assets.leetcode.com/uploads/2019/09/26/ball.jpg\")
You have a 2-D grid of size m x n representing a box, and you have n balls. The box is open on the top and bottom sides.
Each cell in the box has a diagonal board spanning two corners of the cell that can redirect a ball to the right or to the left.
\n\n1.-1.We drop one ball at the top of each column of the box. Each ball can get stuck in the box or fall out of the bottom. A ball gets stuck if it hits a "V" shaped pattern between two boards or if a board redirects the ball into either wall of the box.
\n\nReturn an array answer of size n where answer[i] is the column that the ball falls out of at the bottom after dropping the ball from the ith column at the top, or -1 if the ball gets stuck in the box.
\n
Example 1:
\n\n
\nInput: grid = [[1,1,1,-1,-1],[1,1,1,-1,-1],[-1,-1,-1,1,1],[1,1,1,1,-1],[-1,-1,-1,-1,-1]]\nOutput: [1,-1,-1,-1,-1]\nExplanation: This example is shown in the photo.\nBall b0 is dropped at column 0 and falls out of the box at column 1.\nBall b1 is dropped at column 1 and will get stuck in the box between column 2 and 3 and row 1.\nBall b2 is dropped at column 2 and will get stuck on the box between column 2 and 3 and row 0.\nBall b3 is dropped at column 3 and will get stuck on the box between column 2 and 3 and row 0.\nBall b4 is dropped at column 4 and will get stuck on the box between column 2 and 3 and row 1.\n\n\n
Example 2:
\n\n\nInput: grid = [[-1]]\nOutput: [-1]\nExplanation: The ball gets stuck against the left wall.\n\n\n
Example 3:
\n\n\nInput: grid = [[1,1,1,1,1,1],[-1,-1,-1,-1,-1,-1],[1,1,1,1,1,1],[-1,-1,-1,-1,-1,-1]]\nOutput: [0,1,2,3,4,-1]\n\n\n
\n
Constraints:
\n\nm == grid.lengthn == grid[i].length1 <= m, n <= 100grid[i][j] is 1 or -1.用一个大小为 m x n 的二维网格 grid 表示一个箱子。你有 n 颗球。箱子的顶部和底部都是开着的。
箱子中的每个单元格都有一个对角线挡板，跨过单元格的两个角，可以将球导向左侧或者右侧。
\n\n1 表示。-1 表示。在箱子每一列的顶端各放一颗球。每颗球都可能卡在箱子里或从底部掉出来。如果球恰好卡在两块挡板之间的 \"V\" 形图案，或者被一块挡导向到箱子的任意一侧边上，就会卡住。
\n\n返回一个大小为 n 的数组 answer ，其中 answer[i] 是球放在顶部的第 i 列后从底部掉出来的那一列对应的下标，如果球卡在盒子里，则返回 -1 。
\n\n
示例 1：
\n\n![\"\"](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2020/12/26/ball.jpg\")
\n输入：grid = [[1,1,1,-1,-1],[1,1,1,-1,-1],[-1,-1,-1,1,1],[1,1,1,1,-1],[-1,-1,-1,-1,-1]]\n输出：[1,-1,-1,-1,-1]\n解释：示例如图：\nb0 球开始放在第 0 列上，最终从箱子底部第 1 列掉出。\nb1 球开始放在第 1 列上，会卡在第 2、3 列和第 1 行之间的 \"V\" 形里。\nb2 球开始放在第 2 列上，会卡在第 2、3 列和第 0 行之间的 \"V\" 形里。\nb3 球开始放在第 3 列上，会卡在第 2、3 列和第 0 行之间的 \"V\" 形里。\nb4 球开始放在第 4 列上，会卡在第 2、3 列和第 1 行之间的 \"V\" 形里。\n\n\n
示例 2：
\n\n\n输入：grid = [[-1]]\n输出：[-1]\n解释：球被卡在箱子左侧边上。\n\n\n
示例 3：
\n\n\n输入：grid = [[1,1,1,1,1,1],[-1,-1,-1,-1,-1,-1],[1,1,1,1,1,1],[-1,-1,-1,-1,-1,-1]]\n输出：[0,1,2,3,4,-1]\n\n\n
\n\n
提示：
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