Deduplicate - prefix sum

[hobovsky]

From #39

1. Running out of space

• 7kyu
• Input is a list of strings, output is cumulative concatenated string
• Satisfaction 91% with 4.3k completions
• 1 pending issue
• 4 languages + 1 pending translation (C++ exclusive)
• Published Nov 2015, author inactive

2. Number to digit tiers

• 7kyu
• Input is a stringified number, output is a cumulative concatenated string
• Satisfaction 92% with ~2.8k completions
• No pending issues
• 6 languages + 2 pending translations
• Published Jan 2017, author inactive

3. Sum it continuously

• 7kyu
• Input is a list of numbers, output is a cumulative sum
• Satisfaction 90% with 762 completions
• 1 pending issue
• 4 languages (Nim exclusive)
• Published Sep 2017, author active

[hobovsky]

I used almost identical solutions to solve all three kata, but maybe the string vs int input is different enough? I don't know, and I have no good candidate(s) to keep. Any suggestions?

[monadius]

3 asks to compute prefix sums of integers. It is a classical exercise. I am surprised that there are no other duplicates of this task. If it is not an identical duplicate of some other kata, then we should keep it.

1 is a variation of prefix sums with strings. It is not a big difference for languages like Python or JavaScript. But it can be more tricky in C or even Java (by the way its Java translation is broken). So we may keep it also.

2 can be solved in exactly the same way as 1 (with an additional number to string conversion). But it also allows simpler solutions with slices. I don't think that this kata adds anything new to the other two katas. So it can be retired.

[dramforever]

I think 2 allows a good variation of solutions, like slicing or dividing by 10 on the number instead.

I agree with monadius said above about 1 and 3.

I wouldn't consider these 3 duplicates. I'd say keep all.

[CiprianAmza]

I would say to keep all 3 (3 is basic accumulate exercise and I don't consider it a duplicate). 1 and 2 have a similar idea, but I don't think they are duplicates.