Nice explanation, very in depth. I had to check one of the algorithms a number of times, thinking I was missing something as I couldn't see why it wouldn't iter

Nice explanation, very in depth. I had to check one of the algorithms a number of times, thinking I was missing something as I couldn't see why it wouldn't iterate beyond the array. Figured it out as the initial arrays are labeled with the 1 as the first index, but as you pointed out the whole iterator changes subtley and looks alien.