项目欧拉号8

Question

他们让我学习JavaScript工作，所以我在Project Euler上做一些帮助我学习的解决方案。

我problem 8的解决方案适用于他们给出的4个数字示例，如果我将13s更改为4s，但不能得到13个数字的正确答案，如问题所示。

我在C中永远解决了这个问题，并且不记得它给了我这么多麻烦。我是用JavaScript做错了还是我的代码出错了？在任何一种情况下，请指出我正确的方向。

我的代码：

var numbas = "\
73167176531330624919225119674426574742355349194934\
96983520312774506326239578318016984801869478851843\
85861560789112949495459501737958331952853208805511\
12540698747158523863050715693290963295227443043557\
66896648950445244523161731856403098711121722383113\
62229893423380308135336276614282806444486645238749\
30358907296290491560440772390713810515859307960866\
70172427121883998797908792274921901699720888093776\
65727333001053367881220235421809751254540594752243\
52584907711670556013604839586446706324415722155397\
53697817977846174064955149290862569321978468622482\
83972241375657056057490261407972968652414535100474\
82166370484403199890008895243450658541227588666881\
16427171479924442928230863465674813919123162824586\
17866458359124566529476545682848912883142607690042\
24219022671055626321111109370544217506941658960408\
07198403850962455444362981230987879927244284909188\
84580156166097919133875499200524063689912560717606\
05886116467109405077541002256983155200055935729725\
71636269561882670428252483600823257530420752963450";

var biggestProduct = 0;
var currentProduct = 0;
var currentNumbas = {};

function product (proddedNumbas){
    var productHolda = 1;
    for (var i = 0; i < 13; i++)
        productHolda *= proddedNumbas[i];
    return productHolda;
}

for (var j = 0; j < 1000; j++)
    for (var i = 0; i < 13; i++){
        currentNumbas[i] = numbas[j+i];
        currentProduct = product(currentNumbas);
        if (currentProduct > biggestProduct)
            biggestProduct = currentProduct;
    }

console.log(biggestProduct);

Answer 1

你的循环应该是

for (var j = 0; j < 1000; j++) {
    for (var i = 0; i < 13; i++) {
        currentNumbas[i] = numbas[j+i];
        currentProduct = product(currentNumbas);
    }
    if (currentProduct > biggestProduct)
        biggestProduct = currentProduct;
}

你只需要将if子句移到内部循环之外;这将比较完成后的产品。

这给出了预期答案23514624000。