* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
2.5 KiB
2.5 KiB
id, title, challengeType, videoUrl, dashedName
id | title | challengeType | videoUrl | dashedName |
---|---|---|---|---|
594810f028c0303b75339ad6 | 勾选村号码表示 | 5 | zeckendorf-number-representation |
--description--
正如数字可以用位置表示法表示为十(十进制)或二(二进制)的幂的倍数之和;所有正整数都可以表示为Fibonacci系列的不同成员的一次或零次的总和。
回想一下,第一六个不同斐波那契数是: 1, 2, 3, 5, 8, 13
。十进制数11可以用位置表示法写成0*13 + 1*8 + 0*5 + 1*3 + 0*2 + 0*1
或010100
,其中列表示乘以序列的特定成员。前导零被丢弃,因此十进制11变为10100
。
10100不是从斐波那契数字中得到11的唯一方法,但是0*13 + 1*8 + 0*5 + 0*3 + 1*2 + 1*1
或010011也代表十进制11。对于真正的Zeckendorf数字还有一个额外的限制,即“不能使用两个连续的Fibonacci数”,这导致了前一个独特的解决方案。
任务:编写一个函数,按顺序生成并返回前N个Zeckendorf数的数组。
--hints--
zeckendorf必须是功能
assert.equal(typeof zeckendorf, 'function');
你的zeckendorf
函数应该返回正确的答案
assert.deepEqual(answer, solution20);
--seed--
--after-user-code--
const range = (m, n) => (
Array.from({
length: Math.floor(n - m) + 1
}, (_, i) => m + i)
);
const solution20 = [
'1', '10', '100', '101', '1000', '1001', '1010', '10000', '10001',
'10010', '10100', '10101', '100000', '100001', '100010', '100100', '100101',
'101000', '101001', '101010'
];
const answer = range(1, 20).map(zeckendorf);
--seed-contents--
function zeckendorf(n) {
}
--solutions--
// zeckendorf :: Int -> String
function zeckendorf(n) {
const f = (m, x) => (m < x ? [m, 0] : [m - x, 1]);
return (n === 0 ? ([0]) :
mapAccumL(f, n, reverse(
tail(fibUntil(n))
))[1]).join('');
}
// fibUntil :: Int -> [Int]
let fibUntil = n => {
const xs = [];
until(
([a]) => a > n,
([a, b]) => (xs.push(a), [b, a + b]), [1, 1]
);
return xs;
};
let mapAccumL = (f, acc, xs) => (
xs.reduce((a, x) => {
const pair = f(a[0], x);
return [pair[0], a[1].concat(pair[1])];
}, [acc, []])
);
let until = (p, f, x) => {
let v = x;
while (!p(v)) v = f(v);
return v;
};
const tail = xs => (
xs.length ? xs.slice(1) : undefined
);
const reverse = xs => xs.slice(0).reverse();