# GeetCode Hub

There is a 2D `grid` of size `n x n` where each cell of this grid has a lamp that is initially turned off.

You are given a 2D array of lamp positions `lamps`, where `lamps[i] = [rowi, coli]` indicates that the lamp at `grid[rowi][coli]` is turned on. Even if the same lamp is listed more than once, it is turned on.

When a lamp is turned on, it illuminates its cell and all other cells in the same row, column, or diagonal.

You are also given another 2D array `queries`, where `queries[j] = [rowj, colj]`. For the `jth` query, determine whether `grid[rowj][colj]` is illuminated or not. After answering the `jth` query, turn off the lamp at `grid[rowj][colj]` and its 8 adjacent lamps if they exist. A lamp is adjacent if its cell shares either a side or corner with `grid[rowj][colj]`.

Return an array of integers `ans`, where `ans[j]` should be `1` if the cell in the `jth` query was illuminated, or `0` if the lamp was not.

Example 1:

```Input: n = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,0]]
Output: [1,0]
Explanation: We have the initial grid with all lamps turned off. In the above picture we see the grid after turning on the lamp at grid[0][0] then turning on the lamp at grid[4][4].
The 0th query asks if the lamp at grid[1][1] is illuminated or not (the blue square). It is illuminated, so set ans[0] = 1. Then, we turn off all lamps in the red square.

The 1st query asks if the lamp at grid[1][0] is illuminated or not (the blue square). It is not illuminated, so set ans[1] = 0. Then, we turn off all lamps in the red rectangle.

```

Example 2:

```Input: n = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,1]]
Output: [1,1]
```

Example 3:

```Input: n = 5, lamps = [[0,0],[0,4]], queries = [[0,4],[0,1],[1,4]]
Output: [1,1,0]
```

Constraints:

• `1 <= n <= 109`
• `0 <= lamps.length <= 20000`
• `0 <= queries.length <= 20000`
• `lamps[i].length == 2`
• `0 <= rowi, coli < n`
• `queries[j].length == 2`
• `0 <= rowj, colj < n`

class Solution { public int[] gridIllumination(int n, int[][] lamps, int[][] queries) { } }
Hard