# 2373. Largest Local Values in a Matrix """ given an 'n n' integer matrix grid. generate an integer matrix 'max_local' of size '(n - 2) (n - 2)' such that 'max_local[i][j]' is equal to the largest value of the 3 3 matrix in 'grid' centred around row 'i + 1' and column 'j + 1'. in other words, we want to find the largest value in every contiguous 3 3 matrix in 'grid'. return the generated matrix. """ class Solution(object): def largestLocal(self, grid): """ :type grid: List[List[int]] :rtype: List[List[int]] """ n = len(grid) ans = [[0] * (n - 2) for _ in range(n - 2)] for i in range(n - 2): for j in range(n - 2): ans[i][j] = max( grid[ii][jj] for ii in range(i, i + 3) for jj in range(j, j + 3) ) return ans if __name__ == "__main__": obj = Solution() print( obj.largestLocal(grid=[[9, 9, 8, 1], [5, 6, 2, 6], [8, 2, 6, 4], [6, 2, 2, 2]]) ) print( obj.largestLocal( grid=[ [1, 1, 1, 1, 1], [1, 1, 1, 1, 1], [1, 1, 2, 1, 1], [1, 1, 1, 1, 1], [1, 1, 1, 1, 1], ] ) )