# 10.14 Study Log 1.75h all on 2 codewars problems.

This one took me an hour, and then I see that the highest rated answer is only 5 lines long!

```//https://www.codewars.com/kata/5592e3bd57b64d00f3000047/train/javascript

// 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 + ...
// + 1^3 = m if such a n exists or -1 if there is no such n.

var cubeHash={}
function findNb(m) {

for (let n = 0; findVol(n) <= m; n++){
if (findVol(n) == m ) return n
}
return (-1);
}

function findVol(n) {
let volume = 0
for (let i = n; i > 0; i--) { //iterate down and add up
volume += cubeLookup(i)
}
return volume
}

function cubeLookup(n) { //get and set cached values
if (n in cubeHash) { //check for cached value
return cubeHash[n]
} else { //make it and cache it
cubeHash[n] = Math.pow(n,3)
delete cubeHash[n-3]
return cubeHash[n]
}
}```

Then I worked for about 45 min on this problem. I’m getting there, but it’s time for bed. I’m coding in a hotel bathroom while my family sleeps close by. It’s not very comfortable or motivational, but it’s also not a 0-day for the study log!

Today was a good day in that I stayed focused on one language, I remembered to use an es6 arrow function and Math.pow(), and I solved one problem. Small steps, but they are all in the right direction.

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