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.

Example

Consider the following matrix:

[
    [1, 3, 5, 7],
    [10, 11, 16, 20],
    [23, 30, 34, 50]
]

Giventarget = 3, returntrue.

Challenge

O(log(n) + log(m)) time