struct RectI {
    int left; int top; int right; int bottom;

    BOOL Intersects(const RectI& rc) { return (!(left > rc.left || right < rc.right || top > rc.bottom || bottom < rc.top)); }
    BOOL Intersects(int l, int t, int r, int b) { return Intersects(RectI(l, t, r, b)); }
};