Given an array rectangles where rectangles[i] = [x_i, y_i, a_i, b_i] represents an axis aligned rectangle with bottom left corner $(x_i, y_i)$ and top right corner $(a_i, b_i)$, return true if all the given rectangles form an exact cover of a rectangular region without any gaps or overlapping areas, otherwise return false.

Constraints:

• $1 \leq$ rectangles.length $\leq 2 imes 10^4$

• rectangles[i].length $= 4$

• $-10^5 \leq x_i < a_i \leq 10^5$

• $-10^5 \leq y_i < b_i \leq 10^5$

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