g2201_2300.s2201_count_artifacts_that_can_be_extracted

Class Solution

java.lang.Object

g2201_2300.s2201_count_artifacts_that_can_be_extracted.Solution

public class Solution
extends Object

2201 - Count Artifacts That Can Be Extracted.

Medium

There is an n x n 0-indexed grid with some artifacts buried in it. You are given the integer n and a 0-indexed 2D integer array artifacts describing the positions of the rectangular artifacts where artifacts[i] = [r1i, c1i, r2i, c2i] denotes that the ith artifact is buried in the subgrid where:

• (r1i, c1i) is the coordinate of the top-left cell of the ith artifact and
• (r2i, c2i) is the coordinate of the bottom-right cell of the ith artifact.

You will excavate some cells of the grid and remove all the mud from them. If the cell has a part of an artifact buried underneath, it will be uncovered. If all the parts of an artifact are uncovered, you can extract it.

Given a 0-indexed 2D integer array dig where dig[i] = [ri, ci] indicates that you will excavate the cell (ri, ci), return the number of artifacts that you can extract.

The test cases are generated such that:

• No two artifacts overlap.
• Each artifact only covers at most 4 cells.
• The entries of dig are unique.

Example 1:

Input: n = 2, artifacts = [[0,0,0,0],[0,1,1,1]], dig = [[0,0],[0,1]]

Output: 1

Explanation: The different colors represent different artifacts. Excavated cells are labeled with a ‘D’ in the grid. There is 1 artifact that can be extracted, namely the red artifact. The blue artifact has one part in cell (1,1) which remains uncovered, so we cannot extract it. Thus, we return 1.

Example 2:

Input: n = 2, artifacts = [[0,0,0,0],[0,1,1,1]], dig = [[0,0],[0,1],[1,1]]

Output: 2

Explanation: Both the red and blue artifacts have all parts uncovered (labeled with a ‘D’) and can be extracted, so we return 2.

Constraints:

• 1 <= n <= 1000
• 1 <= artifacts.length, dig.length <= min(n2, 105)
• artifacts[i].length == 4
• dig[i].length == 2
• 0 <= r1i, c1i, r2i, c2i, ri, ci <= n - 1
• r1i <= r2i
• c1i <= c2i
• No two artifacts will overlap.
• The number of cells covered by an artifact is at most 4.
• The entries of dig are unique.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	digArtifacts(int n, int[][] artifacts, int[][] dig)

Methods inherited from class java.lang.Object

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

Constructor Detail

Solution

public Solution()

Method Detail

digArtifacts

public int digArtifacts(int n,
                        int[][] artifacts,
                        int[][] dig)