A rectangle is represented as a list [x1, y1, x2, y2], where (x1, y1) are the coordinates of its bottom-left corner, and (x2, y2) are the coordinates of its top-right corner.
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.
Input: rec1 = [0,0,2,2], rec2 = [1,1,3,3]
Input: rec1 = [0,0,1,1], rec2 = [1,0,2,1]
1.Both rectangles rec1 and rec2 are lists of 4 integers.
2.All coordinates in rectangles will be between -10^9 and 10^9.
def isRectangleOverlap(rec1, rec2):