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Add project euler problem 17 #775

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vlecommandeur wants to merge 1 commit into TheAlgorithms:master from vlecommandeur:problem17
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1 change: 1 addition & 0 deletions DIRECTORY.md
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* [Problem014](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem014.js)
* [Problem015](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem015.js)
* [Problem016](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem016.js)
* [Problem017](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem017.js)
* [Problem020](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem020.js)
* [Problem1](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem1.js)
* [Problem10](https://github.com/TheAlgorithms/Javascript/blob/master/Project-Euler/Problem10.js)
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77 changes: 77 additions & 0 deletions Project-Euler/Problem017.js
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/*
https://projecteuler.net/problem=17

If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 +たす 3 +たす 5 +たす 4 +たす 4 =わ 19 letters used in total.
If all the numbers from 1 to 1000 (one thousand) inclusive were written out in words, how many letters would be used?

NOTE: Do not count spaces or hyphens. For example, 342 (three hundred and forty-two) contains 23 letters and 115 (one hundred and fifteen) contains 20 letters. The use of "and" when writing out numbers is in compliance with British usage.
*/

const numberToCharMap = {
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@raklaptudirm raklaptudirm Oct 20, 2021

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Move the variable inside the function.

0: '',
1: 'one',
2: 'two',
3: 'three',
4: 'four',
5: 'five',
6: 'six',
7: 'seven',
8: 'eight',
9: 'nine',
10: 'ten',
11: 'eleven',
12: 'twelve',
13: 'thirteen',
14: 'fourteen',
15: 'fifteen',
16: 'sixteen',
17: 'seventeen',
18: 'eighteen',
19: 'nineteen',
20: 'twenty',
30: 'thirty',
40: 'forty',
50: 'fifty',
60: 'sixty',
70: 'seventy',
80: 'eighty',
90: 'ninety',
100: 'hundred',
1000: 'onethousand'
}

const getOnes = (n) => Math.floor(n % 10)
const getTens = (n) => Math.floor((n / 10) % 10)
const getHundreds = (n) => Math.floor((n / 100) % 10)

const countNumberLetter = (n) => {
let numberLetter = ''

for (let i = 1; i <= n; i++) {
const ones = getOnes(i)
const tens = getTens(i)
const hundreds = getHundreds(i)

if (i <= 20 || (i < 100 && ones === 0) || i === 1000)
numberLetter += numberToCharMap[i]
else if (i < 100)
numberLetter += numberToCharMap[tens * 10] + numberToCharMap[ones]
else if (i < 1000) {
if (ones !== 0 || tens !== 0) numberLetter += 'and'
const tensPlusOnes = tens * 10 + ones
numberLetter +=
tensPlusOnes < 20
? numberToCharMap[hundreds] +
numberToCharMap[100] +
numberToCharMap[tensPlusOnes]
: numberToCharMap[hundreds] +
numberToCharMap[100] +
numberToCharMap[tens * 10] +
numberToCharMap[ones]
}
}

return numberLetter.length
}

export { countNumberLetter }
13 changes: 13 additions & 0 deletions Project-Euler/test/Problem017.test.js
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import { countNumberLetter } from '../Problem017'

describe('checkCountNumberLetter', () => {
it('Solves the problem statement example', () => {
const numberLetter = countNumberLetter(1000)
expect(numberLetter).toBe(21124)
})

it('Returns first five numbers count', () => {
const numberLetter = countNumberLetter(5)
expect(numberLetter).toBe(19)
})
})

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