I completed this kata in Ruby but hated it. Here are my issues:

• Why did the levels switch from perfect squares to not?
• Why did gold move from the top level in 1 through 4 but the fourth level for 5, the third level for 6, the second level for 7, etc.?
• Why is the parameter called "level" and can go up to 15, but there are never more than 4 levels in the answer hash?

Maybe if I had played Minecraft before, I could have solved this kata without using a kind of brute force case statement. I feel as if there was not enough detail in the description. Plus, nothing I Googled explained how the beacon tower needed to go beyond the four basic levels (9 to 25 to 49 to 81 blocks) only that you could make the tower shorter.

I feel like I wasted a couple of hours of my time with this kata and that it was more like a level 3 or 4 kata.

Python translation: https://www.codewars.com/kumite/647dede6fdf80bbaded8558e?sel=647dede6fdf80bbaded8558e

Write a function that calculates the minimum amount of fuel needed to produce a certain number of iron ingots.
This function should return a dictionary of the form ...

When there are multiple solution, which one return?

1. any valid combination of items?
2. maximize large items?
3. minimum total number of items?

(spoiler: 2)

The orange area represents areas where air could catch flame if the gray and orange areas are not clear of flammable blocks (for example, wood blocks).
Does it means the wood can not in both area?
Or wood can in gray area, and orange area would change depend on gray area?

Trivial map/filter/reduce is not a novel kata idea at this point.

Python translation kumited. Please review and approve.

Note: kata author is inactive

When reading the exercise i was confused about the goal. I got the impression the goal was to have the minimum number of items that add exactly to the fuel needed, then i realized it was far more simple and it was only a matter of adding the largest that fitted until getting the final value.

If there was a cost associated to each item (the largest would have the least cost per unit) the problem could be re-phrased and less dubious.

Good Kata, simpler than i expected.

JS:

• The description is incomplete. It should be mentioned that lava expands exactly as it's shown in the image: always same blocks, and always in same direction (upwards).
• Random tests always generate inputs that result in expected false (easy to cheat, see my solution)
• Why limit it to just small houses? Add bigger houses to complete the kata. (you can use reference solution of other users to make it work)
• It seems that js and ruby versions have different behavior, and different houses. I'm confused as to what the expected behaviour for spreading lava is.

A case of number like 4,444,444 (without a dot, meaning 4 mil) and number 4,4 (meaning 4.40) should be added to fixed tests, because they change how numbers should be handled and are only encountered in one or 2 random tests. (nothing mentioned in description either)

Also it would be helpful if description mentioned padding not only decimal places to 2 digits, but also hundreds to 3 digits, if neccessary.

Lastly some more edge cases could be added, say sum of 4,000,000.00.

Typescript translation and Julia translation