The solution to the first problem is the Joe Morris algorithm. I first came across it about 20 years ago and really struggled to visualize what was going on.

The solution to the first problem is the Joe Morris algorithm. I first came across it about 20 years ago and really struggled to visualize what was going on. [1] https://yuyuan.org/MorrisAlgorithm/ https://yuyuan.org/MorrisAlgorithm/