You are given a 0-indexed m x n integer matrix grid and an integer k. You are currently at position (0, 0) and you want to reach position (m - 1, n - 1) moving only down or right.
Return the number of paths where the sum of the elements on the path is divisible by k. Since the answer may be very large, return it modulo 109 + 7.
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Example 1:
\n![](\"https://assets.leetcode.com/uploads/2022/08/13/image-20220813183124-1.png\")
\n\nInput: grid = [[5,2,4],[3,0,5],[0,7,2]], k = 3\nOutput: 2\nExplanation: There are two paths where the sum of the elements on the path is divisible by k.\nThe first path highlighted in red has a sum of 5 + 2 + 4 + 5 + 2 = 18 which is divisible by 3.\nThe second path highlighted in blue has a sum of 5 + 3 + 0 + 5 + 2 = 15 which is divisible by 3.\n\n\n
Example 2:
\n![](\"https://assets.leetcode.com/uploads/2022/08/17/image-20220817112930-3.png\")
\n\nInput: grid = [[0,0]], k = 5\nOutput: 1\nExplanation: The path highlighted in red has a sum of 0 + 0 = 0 which is divisible by 5.\n\n\n
Example 3:
\n![](\"https://assets.leetcode.com/uploads/2022/08/12/image-20220812224605-3.png\")
\n\nInput: grid = [[7,3,4,9],[2,3,6,2],[2,3,7,0]], k = 1\nOutput: 10\nExplanation: Every integer is divisible by 1 so the sum of the elements on every possible path is divisible by k.\n\n\n
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Constraints:
\n\nm == grid.lengthn == grid[i].length1 <= m, n <= 5 * 1041 <= m * n <= 5 * 1040 <= grid[i][j] <= 1001 <= k <= 50Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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