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| // @Title: 网格照明 (Grid Illumination)
// @Author: 15816537946@163.com
// @Date: 2022-02-08 23:55:29
// @Runtime: 184 ms
// @Memory: 16.5 MB
func gridIllumination(n int, lamps, queries [][]int) []int {
type pair struct{ x, y int }
points := map[pair]bool{}
row := map[int]int{}
col := map[int]int{}
diagonal := map[int]int{}
antiDiagonal := map[int]int{}
for _, lamp := range lamps {
r, c := lamp[0], lamp[1]
p := pair{r, c}
if points[p] {
continue
}
points[p] = true
row[r]++
col[c]++
diagonal[r-c]++
antiDiagonal[r+c]++
}
ans := make([]int, len(queries))
for i, query := range queries {
r, c := query[0], query[1]
if row[r] > 0 || col[c] > 0 || diagonal[r-c] > 0 || antiDiagonal[r+c] > 0 {
ans[i] = 1
}
for x := r - 1; x <= r+1; x++ {
for y := c - 1; y <= c+1; y++ {
if x < 0 || y < 0 || x >= n || y >= n || !points[pair{x, y}] {
continue
}
delete(points, pair{x, y})
row[x]--
col[y]--
diagonal[x-y]--
antiDiagonal[x+y]--
}
}
}
return ans
}
|