You are given a 0-indexed integer array arr, and an m x n integer matrix mat. arr and mat both contain all the integers in the range [1, m * n].
Go through each index i in arr starting from index 0 and paint the cell in mat containing the integer arr[i].
Return the smallest index i at which either a row or a column will be completely painted in mat.
\n
Example 1:
\n![\"image](\"https://assets.leetcode.com/uploads/2023/01/18/grid1.jpg\")
\n\nInput: arr = [1,3,4,2], mat = [[1,4],[2,3]]\nOutput: 2\nExplanation: The moves are shown in order, and both the first row and second column of the matrix become fully painted at arr[2].\n\n\n
Example 2:
\n![\"image](\"https://assets.leetcode.com/uploads/2023/01/18/grid2.jpg\")
\n\nInput: arr = [2,8,7,4,1,3,5,6,9], mat = [[3,2,5],[1,4,6],[8,7,9]]\nOutput: 3\nExplanation: The second column becomes fully painted at arr[3].\n\n\n
\n
Constraints:
\n\nm == mat.lengthn = mat[i].lengtharr.length == m * n1 <= m, n <= 1051 <= m * n <= 1051 <= arr[i], mat[r][c] <= m * narr are unique.mat are unique.Compiled 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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