{ "data": { "question": { "questionId": "3390", "questionFrontendId": "3111", "categoryTitle": "Algorithms", "boundTopicId": 2734245, "title": "Minimum Rectangles to Cover Points", "titleSlug": "minimum-rectangles-to-cover-points", "content": "
You are given a 2D integer array points
, where points[i] = [xi, yi]
. You are also given an integer w
. Your task is to cover all the given points with rectangles.
Each rectangle has its lower end at some point (x1, 0)
and its upper end at some point (x2, y2)
, where x1 <= x2
, y2 >= 0
, and the condition x2 - x1 <= w
must be satisfied for each rectangle.
A point is considered covered by a rectangle if it lies within or on the boundary of the rectangle.
\n\nReturn an integer denoting the minimum number of rectangles needed so that each point is covered by at least one rectangle.
\n\nNote: A point may be covered by more than one rectangle.
\n\n\n
Example 1:
\n\nInput: points = [[2,1],[1,0],[1,4],[1,8],[3,5],[4,6]], w = 1
\n\nOutput: 2
\n\nExplanation:
\n\nThe image above shows one possible placement of rectangles to cover the points:
\n\n(1, 0)
and its upper end at (2, 8)
(3, 0)
and its upper end at (4, 8)
Example 2:
\n\nInput: points = [[0,0],[1,1],[2,2],[3,3],[4,4],[5,5],[6,6]], w = 2
\n\nOutput: 3
\n\nExplanation:
\n\nThe image above shows one possible placement of rectangles to cover the points:
\n\n(0, 0)
and its upper end at (2, 2)
(3, 0)
and its upper end at (5, 5)
(6, 0)
and its upper end at (6, 6)
Example 3:
\n\nInput: points = [[2,3],[1,2]], w = 0
\n\nOutput: 2
\n\nExplanation:
\n\nThe image above shows one possible placement of rectangles to cover the points:
\n\n(1, 0)
and its upper end at (1, 2)
(2, 0)
and its upper end at (2, 3)
\n
Constraints:
\n\n1 <= points.length <= 105
points[i].length == 2
0 <= xi == points[i][0] <= 109
0 <= yi == points[i][1] <= 109
0 <= w <= 109
(xi, yi)
are distinct.给你一个二维整数数组 point
,其中 points[i] = [xi, yi]
表示二维平面内的一个点。同时给你一个整数 w
。你需要用矩形 覆盖所有 点。
每个矩形的左下角在某个点 (x1, 0)
处,且右上角在某个点 (x2, y2)
处,其中 x1 <= x2
且 y2 >= 0
,同时对于每个矩形都 必须 满足 x2 - x1 <= w
。
如果一个点在矩形内或者在边上,我们说这个点被矩形覆盖了。
\n\n请你在确保每个点都 至少 被一个矩形覆盖的前提下,最少 需要多少个矩形。
\n\n注意:一个点可以被多个矩形覆盖。
\n\n\n\n
示例 1:
\n\n输入:points = [[2,1],[1,0],[1,4],[1,8],[3,5],[4,6]], w = 1
\n\n输出:2
\n\n解释:
\n\n上图展示了一种可行的矩形放置方案:
\n\n(1, 0)
,右上角在 (2, 8)
。(3, 0)
,右上角在 (4, 8)
。示例 2:
\n\n输入:points = [[0,0],[1,1],[2,2],[3,3],[4,4],[5,5],[6,6]], w = 2
\n\n输出:3
\n\n解释:
\n\n上图展示了一种可行的矩形放置方案:
\n\n(0, 0)
,右上角在 (2, 2)
。(3, 0)
,右上角在 (5, 5)
。(6, 0)
,右上角在 (6, 6)
。示例 3:
\n\n输入:points = [[2,3],[1,2]], w = 0
\n\n输出:2
\n\n解释:
\n\n上图展示了一种可行的矩形放置方案:
\n\n(1, 0)
,右上角在 (1, 2)
。(2, 0)
,右上角在 (2, 3)
。\n\n
提示:
\n\n1 <= points.length <= 105
points[i].length == 2
0 <= xi == points[i][0] <= 109
0 <= yi == points[i][1] <= 109
0 <= w <= 109
(xi, yi)
互不相同。y
values don't matter; only the x
values matter.",
"Sort all the points by xi
.",
"Each time, select the smallest x
value, x0
, from the unselected points, and then select all the points with x
values not larger than x0 + w
."
],
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