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add Project Euler problem8 solution #652
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| /* | ||
| Project Euler Problem 8: https://projecteuler.net/problem=8 | ||
| Largest product in a series | ||
| */ | ||
|
|
||
| // Get the number into an array | ||
| const grid = ` | ||
| 73167176531330624919225119674426574742355349194934 | ||
| 96983520312774506326239578318016984801869478851843 | ||
| 85861560789112949495459501737958331952853208805511 | ||
| 12540698747158523863050715693290963295227443043557 | ||
| 66896648950445244523161731856403098711121722383113 | ||
| 62229893423380308135336276614282806444486645238749 | ||
| 30358907296290491560440772390713810515859307960866 | ||
| 70172427121883998797908792274921901699720888093776 | ||
| 65727333001053367881220235421809751254540594752243 | ||
| 52584907711670556013604839586446706324415722155397 | ||
| 53697817977846174064955149290862569321978468622482 | ||
| 83972241375657056057490261407972968652414535100474 | ||
| 82166370484403199890008895243450658541227588666881 | ||
| 16427171479924442928230863465674813919123162824586 | ||
| 17866458359124566529476545682848912883142607690042 | ||
| 24219022671055626321111109370544217506941658960408 | ||
| 07198403850962455444362981230987879927244284909188 | ||
| 84580156166097919133875499200524063689912560717606 | ||
| 05886116467109405077541002256983155200055935729725 | ||
| 71636269561882670428252483600823257530420752963450 | ||
| `.trim().replace(/\n/g, "").split("") | ||
|
|
||
| const x = 13 | ||
| let max = 0 | ||
|
|
||
| function largestProduct () { | ||
| grid.forEach((str) => { | ||
| if (str.length < x) { | ||
| return | ||
| } | ||
| for (let i = 0, l = str.length; i <= l - x; i++) { | ||
| // substring() method returns the part of the string between the start and end indexes | ||
| const digits = str.substring(i, i + x).split('') | ||
| const product = digits.reduce((prod, c) => prod * parseInt(c), 1) | ||
| // update the max variable in case if our product is larger then max | ||
| if (product > max) max = product | ||
| } | ||
| }) | ||
| return max | ||
| } | ||
| console.log(largestProduct()) // output 23514624000 |
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