836. Rectangle Overlap

just draw the pic,

draw the ways of no interaction in left, right, top , buttom, then can conduct the result.

time: O(1)

space:(1)

class Solution {
    public boolean isRectangleOverlap(int[] rec1, int[] rec2) {
        return !(rec1[2] <= rec2[0] ||
                rec1[0] >= rec2[2] ||
                rec1[1] >= rec2[3] ||
                rec1[3] <= rec2[1]);
        
    }
}