Redo: largest concatenation
Folks, two weeks ago, my puzzle was to write a function that returned the largest concatenation of integers. I got lots of answers, which I shared last week. But Val Waeselynck let me in on something: only his worked for this very simple case:
(maxcat [90 9])
The other solutions (including the one I called "exemplary" in the newsletter), return
990 is clearly bigger.
I have to admit something: I didn't test them thoroughly, either. I always expected you, the puzzle player, to test them yourselves. Wouldn't that make a better exercise? But I think it's too much to ask. Who has the time?
So this week, I'm resurfacing the same largest concatenation problem as before. But this time, I've created a testbed. It's a small project with tests. You fill in the stub function with your implementation and test it. Feel free to read the tests for insights.
Here's the problem again:
Largest integer from concatenation
If I have a list of integers, I can concatenate their base-10 strings to get one large integer. However, if I reorder them, then concatenate them, I could get a larger integer. The task here is to find the largest integer you can create by concatenating a given set of integers.
The testbed can be found here.