Problem 44523. Pattern Sum

Created by Dishant Varshney
Appears in Number Manipulation IV

Difficulty:Rate

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Write a function which receives two single digit positive integers, (k and m) as parameters and calculates the total sum as: k + kk + kkk + .... (the last number in the sequence should have m digits) For example, if the two integers are: (4, 5). Your function should return the total sum of: 4 + 44 + 444 + 4444 + 44444. Notice the last number in this sequence has 5 digits. The return value should be 49380.

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Last Solution submitted on Feb 12, 2025

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James on 2 Mar 2018

After some experimentation, I found that you need to multiplying the digit by the increasing powers of 10. The first term is a*10^0. The second term is a*10^1. The third term is a*10^2, and so on. So (10,4) would be 10+100+1000+10000. Granted, the problem statement says "single digit" so 10 and 56 shouldn't really be valid numbers, but we've all messed up problem descriptions and test suites before.

bainhome on 21 Apr 2018

if there are number like "10", "56" in test suite, what's the point for mentioning "single digit positive integers"? is there any misunderstanding about "single digit" between different culture?

goc3 on 13 Jul 2018

The test cases with double-digit numbers have been removed to prevent future confusion. Also, additional single-digit test cases have been added.

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