Package g2301_2400.s2373_largest_local_values_in_a_matrix

Class Solution

  • public class Solution
extends Object
    2373 - Largest Local Values in a Matrix.

    Easy

    You are given an n x n integer matrix grid.

    Generate an integer matrix maxLocal of size (n - 2) x (n - 2) such that:

    • maxLocal[i][j] is equal to the largest value of the 3 x 3 matrix in grid centered around row i + 1 and column j + 1.

    In other words, we want to find the largest value in every contiguous 3 x 3 matrix in grid.

    Return the generated matrix.

    Example 1:

    Input: grid = [[9,9,8,1],[5,6,2,6],[8,2,6,4],[6,2,2,2]]

    Output: [[9,9],[8,6]]

    Explanation: The diagram above shows the original matrix and the generated matrix.

    Notice that each value in the generated matrix corresponds to the largest value of a contiguous 3 x 3 matrix in grid.

    Example 2:

    Input: 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]]

    Output: [[2,2,2],[2,2,2],[2,2,2]]

    Explanation: Notice that the 2 is contained within every contiguous 3 x 3 matrix in grid.

    Constraints:

    • n == grid.length == grid[i].length
    • 3 <= n <= 100
    • 1 <= grid[i][j] <= 100

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • largestLocal

        public int[][] largestLocal​(int[][] grid)