1591. Strange Printer II
https://leetcode.com/problems/strange-printer-ii
Description
There is a strange printer with the following two special requirements:
On each turn, the printer will print a solid rectangular pattern of a single color on the grid. This will cover up the existing colors in the rectangle.
Once the printer has used a color for the above operation, the same color cannot be used again.
You are given a m x n
matrix targetGrid
, where targetGrid[row][col]
is the color in the position (row, col)
of the grid.
Return true
if it is possible to print the matrix targetGrid
, otherwise, return false
.
Example 1:

**Input:** targetGrid = [[1,1,1,1],[1,2,2,1],[1,2,2,1],[1,1,1,1]]
**Output:** true
Example 2:

**Input:** targetGrid = [[1,1,1,1],[1,1,3,3],[1,1,3,4],[5,5,1,4]]
**Output:** true
Example 3:
**Input:** targetGrid = [[1,2,1],[2,1,2],[1,2,1]]
**Output:** false
**Explanation:** It is impossible to form targetGrid because it is not allowed to print the same color in different turns.
Example 4:
**Input:** targetGrid = [[1,1,1],[3,1,3]]
**Output:** false
Constraints:
m == targetGrid.length
n == targetGrid[i].length
1 <= m, n <= 60
1 <= targetGrid[row][col] <= 60
ac
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