/***
* Problem 8 -- Largest Product in a Series
*
* @author RepeaterCreeper
*/
var grid = `73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450`;
/**
* Largest Adjacent Numbers
*
* @returns int
*/
function largestAdjacentNumbers(grid, consecutiveLength = 4, separator = "\n") {
let gridData = grid.split("\n"),
largestProduct = 0;
for (var row in gridData) {
currentRow = gridData[row].split('').map(x => parseInt(x));
for (var i = 0; i < currentRow.length - consecutiveLength; i++) {
combination = currentRow.slice(i, i + consecutiveLength);
if (!combination.includes(0)) {
product = combination.reduce(function(a, b) {
return a * b
});
if (largestProduct < product) largestProduct = product;
}
}
}
return largestProduct;
}
console.log(largestAdjacentNumbers(grid, 13));
问题:
所以问题是,无论我做什么,我的代码都停留在获取:
5377010688
正确答案是:
23514624000
正如您所看到的,这是一个巨大的差异。如果我只是在网格中做一个 4 相邻数字,它就会工作,因为它与 4 相邻数字示例给出的解决方案相匹配。这是:
5832
问题状态:
https://projecteuler.net/problem=8 -- 问题链接
The four adjacent digits in the 1000-digit number that have the greatest product are 9 × 9 × 8 × 9 = 5832.
73167176531330624919225119674426574742355349194934 96983520312774506326239578318016984801869478851843 85861560789112949495459501737958331952853208805511 12540698747158523863050715693290963295227443043557 66896648950445244523161731856403098711121722383113 62229893423380308135336276614282806444486645238749 30358907296290491560440772390713810515859307960866 70172427121883998797908792274921901699720888093776 65727333001053367881220235421809751254540594752243 52584907711670556013604839586446706324415722155397 53697817977846174064955149290862569321978468622482 83972241375657056057490261407972968652414535100474 82166370484403199890008895243450658541227588666881 16427171479924442928230863465674813919123162824586 17866458359124566529476545682848912883142607690042 24219022671055626321111109370544217506941658960408 07198403850962455444362981230987879927244284909188 84580156166097919133875499200524063689912560717606 05886116467109405077541002256983155200055935729725 71636269561882670428252483600823257530420752963450
Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?
最佳答案
问题说:
The four adjacent digits in the 1000-digit number that have the greatest product are 9 × 9 × 8 × 9 = 5832.
(some number over multiple lines, 1000 digits long)
Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?
它并不是要求您迭代每一行 - 它要求您将整个事物解释为一个字符串(或数字)并比较相邻的数字。最初将 grid
转换为单个字符串,您的代码将按预期工作:
var grid = `73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450`
.split('\n').join('');
/**
* Largest Adjacent Numbers
*
* @returns int
*/
function largestAdjacentNumbers(grid, consecutiveLength = 4, separator = "\n") {
let gridData = grid.split("\n"),
largestProduct = 0;
for (var row in gridData) {
currentRow = gridData[row].split('').map(x => parseInt(x));
for (var i = 0; i < currentRow.length - consecutiveLength; i++) {
combination = currentRow.slice(i, i + consecutiveLength);
if (!combination.includes(0)) {
product = combination.reduce(function(a, b) {
return a * b
});
if (largestProduct < product) largestProduct = product;
}
}
}
return largestProduct;
}
console.log(largestAdjacentNumbers(grid, 13));
但是,既然输入中没有行或换行符,最好删除在每一行上迭代的部分,并修复离一错误,如评论中所述:
var grid = `73167176531330624919225119674426574742355349194934
96983520312774506326239578318016984801869478851843
85861560789112949495459501737958331952853208805511
12540698747158523863050715693290963295227443043557
66896648950445244523161731856403098711121722383113
62229893423380308135336276614282806444486645238749
30358907296290491560440772390713810515859307960866
70172427121883998797908792274921901699720888093776
65727333001053367881220235421809751254540594752243
52584907711670556013604839586446706324415722155397
53697817977846174064955149290862569321978468622482
83972241375657056057490261407972968652414535100474
82166370484403199890008895243450658541227588666881
16427171479924442928230863465674813919123162824586
17866458359124566529476545682848912883142607690042
24219022671055626321111109370544217506941658960408
07198403850962455444362981230987879927244284909188
84580156166097919133875499200524063689912560717606
05886116467109405077541002256983155200055935729725
71636269561882670428252483600823257530420752963450`;
var gridData = grid.split('\n').join('').split('').map(Number);
/**
* Largest Adjacent Numbers
*
* @returns int
*/
function largestAdjacentNumbers(grid, consecutiveLength = 4, separator = "\n") {
let largestProduct = 0;
for (var i = 0; i <= gridData.length - consecutiveLength; i++) {
combination = gridData.slice(i, i + consecutiveLength);
if (!combination.includes(0)) {
const product = combination.reduce(function(a, b) {
return a * b
});
if (largestProduct < product) largestProduct = product;
}
}
return largestProduct;
}
console.log(largestAdjacentNumbers(grid, 13));
关于javascript - 欧拉项目#8——Javascript,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51073915/