> For the complete documentation index, see [llms.txt](https://nataliekung.gitbook.io/ladder_code/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nataliekung.gitbook.io/ladder_code/dropbox/grid-illumination.md).

# Grid Illumination

On a `N x N` grid of cells, each cell `(x, y)` with `0 <= x < N` and `0 <= y < N` has a lamp.

Initially, some number of lamps are on.  `lamps[i]` tells us the location of the `i`-th lamp that is on.  Each lamp that is on illuminates every square on its x-axis, y-axis, and both diagonals (similar to a Queen in chess).

For the i-th query `queries[i] = (x, y)`, the answer to the query is 1 if the cell (x, y) is illuminated, else 0.

After each query `(x, y)` \[in the order given by `queries`], we turn off any lamps that are at cell `(x, y)` or are adjacent 8-directionally (ie., share a corner or edge with cell `(x, y)`.)

Return an array of answers.  Each value `answer[i]` should be equal to the answer of the `i`-th query `queries[i]`.

**Example 1:**

```
Input: N = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,0]]
Output: [1,0]
Explanation: 
Before performing the first query we have both lamps [0,0] and [4,4] on.
The grid representing which cells are lit looks like this, where [0,0] is the top left corner, and [4,4] is the bottom right corner:
1 1 1 1 1
1 1 0 0 1
1 0 1 0 1
1 0 0 1 1
1 1 1 1 1
Then the query at [1, 1] returns 1 because the cell is lit.  After this query, the lamp at [0, 0] turns off, and the grid now looks like this:
1 0 0 0 1
0 1 0 0 1
0 0 1 0 1
0 0 0 1 1
1 1 1 1 1
Before performing the second query we have only the lamp [4,4] on.  Now the query at [1,0] returns 0, because the cell is no longer lit.
```

分析

N 皇后 sodoku

此做法python TLE

```
from collections import Counter
class Solution:
    def gridIllumination(self, N: int, lamps: List[List[int]], queries: List[List[int]]) -> List[int]:
        lamps = set(list(map(tuple, lamps)))
        h,v,l,r = Counter(),Counter(),Counter(),Counter()
        res = []
        for x,y in lamps:
            h[x]+=1
            v[y]+=1
            l[x+y]+=1
            r[x-y]+=1
        for x,y in queries:
            if (x,y) in lamps or h[x] or v[y] or l[x+y] or r[x-y]:
                res.append(1)
            else:
                res.append(0)
            for nx in range(x-1,x+2):
                for ny in range(y-1,y+2):
                    if (nx,ny) in lamps:
                        lamps.remove((nx,ny))
                        h[nx] -= 1
                        if h[nx] == 0:
                            del h[nx]
                        v[ny] -= 1
                        if v[ny] == 0:
                            del v[ny]
                        l[nx+ny] -= 1
                        if l[nx+ny] == 0:
                            del l[nx+ny]
                        r[nx-ny] -= 1
                        if r[nx-ny] == 0:
                            del r[nx-ny]
        return res
                
                
                
        
        
```