6 kyu
Simple Fun #151: Rocks
80 of 641myjinxin2015
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Algorithms
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The code doesn't work with large numbers. I used for loop. Suggestions ?
Well, you are saving each digits to an array. If you look at the sample tests,
36123011will results in277872985(277 million) digits. Array cannot store that many items. You need to look for alternative way to count them.You've got to find an optimal approach mathematically and logically speaking to not go through all numbers one by one
Ruby 3.0 version in this fork
Approved, keep those updates coming!
nice little kata, took some time and scribbling on actual paper to work it out the first time...
I can't get it:
//1..9 = (9 * 1) = 9
//10..99 = (100 * 2) = 200
//100..999 = (1_000 * 3) = 3_000
//1000..9999 = (10_000 * 4) = 40_000
//10_000..99_999 = (100_000 * 5) = 500_000
//100_000..999_999 = (1_000_000 * 4) = 6_000_000
//1_000_000..9_999_999 = (10_000_000 * 7) = 70_000_000
//10_000_000..36_123_011 = (26123011 * 8) = 208_984_088
//sum: 208_984_088 + 70_000_000 + 6_000_000 + 500_000 + 40_000 + 3_000 + 200 + 9 = 285_527_297
//And solution is telling 277_872_985
What am I doing wrong?
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python new test framework is required. updated in this fork
Approved
Duplicate of https://www.codewars.com/kata/55905b7597175ffc1a00005a ? (Just a difference of performance?)
Ruby translation should be updated 3.0, see relevent information here: https://github.com/codewars/content-issues/wiki/List-of-Ruby-Kata-to-Update
Done in latest fork
I'm not a great connoisseur of C#, but is there a good reason for the input and output to be double and not merely integers? It does not make much sense at first glance.
changed to
long, existing solutions will not be invalidatedfunction rocks(int $n): int { $result = 0; for ($i=1;$i<$n+1;$i++) { $result += strlen($i); } return $result; }
works but times out lol
Brute-force solution can not deal with large number
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Your solution is s(l)m(a)a(z)r(y)t, but I think it can not deal with the large numbers such as 1000000000. Try to find the law, make a O(1) solution ;-)
Beta Status:Awaiting smile67 approval
^_^approved;-)
The instructions were quite confusing. However the actual task was great.
Can you point out where is
quite confusing? Thanks.Maybe add some example to description would be better.
OK, good idea ;-)
example added:
For
n = 13, the result should be17.你好
jinxin，一如既往 PHP 和 Coffee :-)好的，已批准。 谢谢！
:D Nice!