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.
\n\nGiven 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:
\n\n4 cells.dig are unique.\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/09/16/untitled-diagram.jpg\")
\n\nInput: n = 2, artifacts = [[0,0,0,0],[0,1,1,1]], dig = [[0,0],[0,1]]\nOutput: 1\nExplanation: \nThe different colors represent different artifacts. Excavated cells are labeled with a 'D' in the grid.\nThere is 1 artifact that can be extracted, namely the red artifact.\nThe blue artifact has one part in cell (1,1) which remains uncovered, so we cannot extract it.\nThus, we return 1.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2019/09/16/untitled-diagram-1.jpg\")
\n\nInput: n = 2, artifacts = [[0,0,0,0],[0,1,1,1]], dig = [[0,0],[0,1],[1,1]]\nOutput: 2\nExplanation: Both the red and blue artifacts have all parts uncovered (labeled with a 'D') and can be extracted, so we return 2. \n\n\n
\n
Constraints:
\n\n1 <= n <= 10001 <= artifacts.length, dig.length <= min(n2, 105)artifacts[i].length == 4dig[i].length == 20 <= r1i, c1i, r2i, c2i, ri, ci <= n - 1r1i <= r2ic1i <= c2i4.dig are unique.Compiled with clang 11 using the latest C++ 17 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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