Package g0301_0400.s0391_perfect_rectangle

Class Solution

java.lang.Object

g0301_0400.s0391_perfect_rectangle.Solution

public class Solution
extends Object

391 - Perfect Rectangle.

Hard

Given an array rectangles where rectangles[i] = [xi, yi, ai, bi] represents an axis-aligned rectangle. The bottom-left point of the rectangle is (xi, yi) and the top-right point of it is (ai, bi).

Return true if all the rectangles together form an exact cover of a rectangular region.

Example 1:

Input: rectangles = [[1,1,3,3],[3,1,4,2],[3,2,4,4],[1,3,2,4],[2,3,3,4]]

Output: true

Explanation: All 5 rectangles together form an exact cover of a rectangular region.

Example 2:

Input: rectangles = [[1,1,2,3],[1,3,2,4],[3,1,4,2],[3,2,4,4]]

Output: false

Explanation: Because there is a gap between the two rectangular regions.

Example 3:

Input: rectangles = [[1,1,3,3],[3,1,4,2],[1,3,2,4],[3,2,4,4]]

Output: false

Explanation: Because there is a gap in the top center.

Example 4:

Input: rectangles = [[1,1,3,3],[3,1,4,2],[1,3,2,4],[2,2,4,4]]

Output: false

Explanation: Because two of the rectangles overlap with each other.

Constraints:

• 1 <= rectangles.length <= 2 * 104
• rectangles[i].length == 4
• -105 <= xi, yi, ai, bi <= 105

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
boolean	isRectangleCover(int[][] rectangles)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

isRectangleCover

public boolean isRectangleCover(int[][] rectangles)