An axis-aligned rectangle is represented as a list `[x1, y1, x2, y2]`, where `(x1, y1)` is the coordinate of its bottom-left corner, and `(x2, y2)` is the coordinate of its top-right corner. Its top and bottom edges are parallel to the X-axis, and its left and right edges are parallel to the Y-axis.

Two rectangles overlap if the area of their intersection is positive. To be clear, two rectangles that only touch at the corner or edges do not overlap.

Given two axis-aligned rectangles `rec1` and `rec2`, return `true` if they overlap, otherwise return `false`.

Example 1:

    Input: rec1 = [0,0,2,2], rec2 = [1,1,3,3]
    Output: true

Example 2:

    Input: rec1 = [0,0,1,1], rec2 = [1,0,2,1]
    Output: false

Example 3:

    Input: rec1 = [0,0,1,1], rec2 = [2,2,3,3]
    Output: false

Constraints:

- `rect1.length == 4`
- `rect2.length == 4`
- `-109 <= rec1[i], rec2[i] <= 109`
- `rec1` and `rec2` represent a valid rectangle with a non-zero area.