2373. Largest Local Values in a Matrix.cpp

class Solution {
public:
    int LocalMax(vector<vector<int>>& grid, int x, int y) {
        int maxValue = 0;
        for (int i = x; i < x + 3; i++) {
            for (int j = y; j < y + 3; j++) {
                maxValue = max(maxValue, grid[i][j]);
            }
        }
        return maxValue;
    }
    
    vector<vector<int>> largestLocal(vector<vector<int>>& grid) {
        int n = grid.size();
        vector<vector<int>> maxLocal(n - 2, vector<int>(n - 2, 0));
        for (int i = 0; i < n - 2; i++) {
            for (int j = 0; j < n - 2; j++) {
                maxLocal[i][j] = LocalMax(grid, i, j);
            }
        }
        return maxLocal;
    }
};