6 kyu
link to kata
my solution
Your task is to construct a building which will be a pile of n cubes. The cube at the bottom will have a volume of n^3, the cube above will have volume of (n−1)^3 and so on until the top which will have a volume of 1^3.
You are given the total volume m of the building. Being given m can you find the number n of cubes you will have to build?
The parameter of the function findNb (find_nb, find-nb, findNb, ...) will be an integer m and you have to return the integer n such as n^3 +(n−1)^3+(n−2)^3+...+1^3= m if such a n exists or -1 if there is no such n.
Examples:
findNb(1071225) --> 45
findNb(91716553919377) --> -1