{ "data": { "question": { "questionId": "1043", "questionFrontendId": "1001", "categoryTitle": "Algorithms", "boundTopicId": 3058, "title": "Grid Illumination", "titleSlug": "grid-illumination", "content": "
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.
\n\nYou 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.
\n
Example 1:
\n\n\nInput: n = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,0]]\nOutput: [1,0]\nExplanation: 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].\nThe 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.\n\nThe 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.\n\n\n\n
Example 2:
\n\n\nInput: n = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,1]]\nOutput: [1,1]\n\n\n
Example 3:
\n\n\nInput: n = 5, lamps = [[0,0],[0,4]], queries = [[0,4],[0,1],[1,4]]\nOutput: [1,1,0]\n\n\n
\n
Constraints:
\n\n1 <= 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
在大小为 n x n
的网格 grid
上,每个单元格都有一盏灯,最初灯都处于 关闭 状态。
给你一个由灯的位置组成的二维数组 lamps
,其中 lamps[i] = [rowi, coli]
表示 打开 位于 grid[rowi][coli]
的灯。即便同一盏灯可能在 lamps
中多次列出,不会影响这盏灯处于 打开 状态。
当一盏灯处于打开状态,它将会照亮 自身所在单元格 以及同一 行 、同一 列 和两条 对角线 上的 所有其他单元格 。
\n\n另给你一个二维数组 queries
,其中 queries[j] = [rowj, colj]
。对于第 j
个查询,如果单元格 [rowj, colj]
是被照亮的,则查询结果为 1
,否则为 0
。在第 j
次查询之后 [按照查询的顺序] ,关闭 位于单元格 grid[rowj][colj]
上及相邻 8 个方向上(与单元格 grid[rowi][coli]
共享角或边)的任何灯。
返回一个整数数组 ans
作为答案, ans[j]
应等于第 j
次查询 queries[j]
的结果,1
表示照亮,0
表示未照亮。
\n\n
示例 1:
\n\n\n输入:n = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,0]]\n输出:[1,0]\n解释:最初所有灯都是关闭的。在执行查询之前,打开位于 [0, 0] 和 [4, 4] 的灯。第 0 次查询检查 grid[1][1] 是否被照亮(蓝色方框)。该单元格被照亮,所以 ans[0] = 1 。然后,关闭红色方框中的所有灯。\n\n第 1 次查询检查 grid[1][0] 是否被照亮(蓝色方框)。该单元格没有被照亮,所以 ans[1] = 0 。然后,关闭红色矩形中的所有灯。\n\n\n\n
示例 2:
\n\n\n输入:n = 5, lamps = [[0,0],[4,4]], queries = [[1,1],[1,1]]\n输出:[1,1]\n\n\n
示例 3:
\n\n\n输入:n = 5, lamps = [[0,0],[0,4]], queries = [[0,4],[0,1],[1,4]]\n输出:[1,1,0]\n\n\n
\n\n
提示:
\n\n1 <= 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
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