 Klee's measure problem

Klee's measure problem is a question in computational geometry, specifically concerning the computation of the volume (or measure) of a union of axis-aligned rectangles in a high-dimensional space. The problem can be succinctly stated as follows: Given a set of \( n \) axis-aligned rectangular boxes in \( d \)-dimensional space, the goal is to compute the measure (or volume) of the union of these rectangles.