{ "data": { "question": { "questionId": "576", "questionFrontendId": "576", "categoryTitle": "Algorithms", "boundTopicId": 1515, "title": "Out of Boundary Paths", "titleSlug": "out-of-boundary-paths", "content": "
There is an m x n
grid with a ball. The ball is initially at the position [startRow, startColumn]
. You are allowed to move the ball to one of the four adjacent cells in the grid (possibly out of the grid crossing the grid boundary). You can apply at most maxMove
moves to the ball.
Given the five integers m
, n
, maxMove
, startRow
, startColumn
, return the number of paths to move the ball out of the grid boundary. Since the answer can be very large, return it modulo 109 + 7
.
\n
Example 1:
\n\nInput: m = 2, n = 2, maxMove = 2, startRow = 0, startColumn = 0\nOutput: 6\n\n\n
Example 2:
\n\nInput: m = 1, n = 3, maxMove = 3, startRow = 0, startColumn = 1\nOutput: 12\n\n\n
\n
Constraints:
\n\n1 <= m, n <= 50
0 <= maxMove <= 50
0 <= startRow < m
0 <= startColumn < n
给你一个大小为 m x n
的网格和一个球。球的起始坐标为 [startRow, startColumn]
。你可以将球移到在四个方向上相邻的单元格内(可以穿过网格边界到达网格之外)。你 最多 可以移动 maxMove
次球。
给你五个整数 m
、n
、maxMove
、startRow
以及 startColumn
,找出并返回可以将球移出边界的路径数量。因为答案可能非常大,返回对 109 + 7
取余 后的结果。
\n\n
示例 1:
\n\n输入:m = 2, n = 2, maxMove = 2, startRow = 0, startColumn = 0\n输出:6\n\n\n
示例 2:
\n\n输入:m = 1, n = 3, maxMove = 3, startRow = 0, startColumn = 1\n输出:12\n\n\n
\n\n
提示:
\n\n1 <= m, n <= 50
0 <= maxMove <= 50
0 <= startRow < m
0 <= startColumn < n
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