One technique I've seen for tomatoes is that if you cut two slices in half you can make a square with the rounded edges facing in towards each other: I'm sure y

One technique I've seen for tomatoes is that if you cut two slices in half you can make a square with the rounded edges facing in towards each other: I'm sure you could do the same with bananas. You could possibly extend your algorigthm to match similarly sized slices to get the most optimal pairings.