symfomany/dojoseventeen

dojoSeventeen

Dojo Seventeen

Dojo time Math( Niveau 6)

Given two times in hours, minutes, and seconds (ie '15:04:24'), add or subtract them. This is a 24 hour clock. Output should be two digits for all numbers: hours, minutes, seconds (ie '04:02:09').

    timeMath('01:24:31', '+', '02:16:05') === '03:40:36'

    timeMath('01:24:31', '-', '02:31:41') === '22:52:50'

Bonus: Utiliser Moment

https://www.codewars.com/kata/time-math

Josephus Survivor ( Niveau 5)

Il est juste mortel... il en restera 1 comme dans Highlander

In this kata you have to correctly return who is the "survivor", ie: the last element of a Josephus permutation.

Basically you have to assume that n people are put into a circle and that they are eliminated in steps of k elements, like this:

Exemple:

    josephus_survivor(7,3) => means 7 people in a circle;
    one every 3 is eliminated until one remains

    [1,2,3,4,5,6,7] - initial sequence
    [1,2,4,5,6,7] => 3 is counted out
    [1,2,4,5,7] => 6 is counted out
    [1,4,5,7] => 2 is counted out
    [1,4,5] => 7 is counted out
    [1,4] => 5 is counted out
    [4] => 1 counted out, 4 is the last element - the survivor!

The above link about the "base" kata description will give you a more thorough insight about the origin of this kind of permutation, but basically that's all that there is to know to solve this kata.

Notes and tips: using the solution to the other kata to check your function may be helpful, but as much larger numbers will be used, using an array/list to compute the number of the survivor may be too slow; you may assume that both n and k will always be >=1.

https://www.codewars.com/kata/josephus-survivor