Search a 2D Matrix
Write an efficient algorithm that searches for a value in an m x n matrix.
This matrix has the following properties:
Integers in each row are sorted from left to right.
The first integer of each row is greater than the last integer of the previous row.
Consider the following matrix:
[1, 3, 5, 7],
[10, 11, 16, 20],
[23, 30, 34, 50]
Given target = 3, return true.
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