106 lines
2.8 KiB
Markdown
106 lines
2.8 KiB
Markdown
---
|
|
title: Combinations
|
|
id: 5958469238c0d8d2632f46db
|
|
localeTitle: 5958469238c0d8d2632f46db
|
|
challengeType: 5
|
|
---
|
|
|
|
## Description
|
|
<section id='description'>
|
|
Tarea:
|
|
<p> Dado los enteros no negativos <big>m</big> y <big>n</big> , genere todas las <a href="http://mathworld.wolfram.com/Combination.html" title="enlace: http://mathworld.wolfram.com/Combination.html">combinaciones</a> de tamaño <big>m</big> de los enteros de <big>0</big> (cero) a <big>n-1</big> en orden ordenado (cada combinación está ordenada y la tabla completa está ordenada). </p>
|
|
Ejemplo:
|
|
<p> <big>3</big> peine <big>5</big> es: </p>
|
|
<pre>
|
|
0 1 2
|
|
0 1 3
|
|
0 1 4
|
|
0 2 2
|
|
0 2 4
|
|
0 3 4
|
|
1 2 3
|
|
1 2 4
|
|
1 3 4
|
|
2 3 4
|
|
</pre>
|
|
</section>
|
|
|
|
## Instructions
|
|
<section id='instructions'>
|
|
|
|
</section>
|
|
|
|
## Tests
|
|
<section id='tests'>
|
|
|
|
```yml
|
|
tests:
|
|
- text: <code>combinations</code> son una función.
|
|
testString: 'assert(typeof combinations === "function", "<code>combinations</code> is a function.");'
|
|
- text: ' <code>combinations(3, 5)</code> deben devolver <code>[[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code> . '
|
|
testString: 'assert.deepEqual(combinations(testInput1[0], testInput1[1]), testOutput1, "<code>combinations(3, 5)</code> should return <code>[[0, 1, 2], [0, 1, 3], [0, 1, 4], [0, 2, 3], [0, 2, 4], [0, 3, 4], [1, 2, 3], [1, 2, 4], [1, 3, 4], [2, 3, 4]]</code>.");'
|
|
- text: ' <code>combinations(4, 6)</code> deben devolver <code>[[0,1,2,3], [0,1,2,4], [0,1,2,5], [0,1,3,4], [0,1,3,5], [0,1,4,5], [0,2,3,4], [0,2,3,5], [0,2,4,5], [0,3,4,5], [1,2,3,4], [1,2,3,5], [1,2,4,5], [1,3,4,5], [2,3,4,5]]</code> '
|
|
testString: 'assert.deepEqual(combinations(testInput2[0], testInput2[1]), testOutput2, "<code>combinations(4, 6)</code> should return <code>[[0,1,2,3], [0,1,2,4], [0,1,2,5], [0,1,3,4], [0,1,3,5], [0,1,4,5], [0,2,3,4], [0,2,3,5], [0,2,4,5], [0,3,4,5], [1,2,3,4], [1,2,3,5], [1,2,4,5], [1,3,4,5], [2,3,4,5]]</code>");'
|
|
|
|
```
|
|
|
|
</section>
|
|
|
|
## Challenge Seed
|
|
<section id='challengeSeed'>
|
|
|
|
<div id='js-seed'>
|
|
|
|
```js
|
|
function combinations (m, n) {
|
|
// Good luck!
|
|
return true;
|
|
}
|
|
```
|
|
|
|
</div>
|
|
|
|
|
|
### After Test
|
|
<div id='js-teardown'>
|
|
|
|
```js
|
|
console.info('after the test');
|
|
```
|
|
|
|
</div>
|
|
|
|
</section>
|
|
|
|
## Solution
|
|
<section id='solution'>
|
|
|
|
|
|
```js
|
|
function combinations (m, n) {
|
|
const nArr = [...Array(n).keys()];
|
|
|
|
return (function generateCombinations (size, numArr) {
|
|
const ret = [];
|
|
|
|
for (let i = 0; i < numArr.length; i++) {
|
|
if (size === 1) {
|
|
ret.push([numArr[i]]);
|
|
}
|
|
else {
|
|
const sub = generateCombinations(size - 1, numArr.slice(i + 1, numArr.length));
|
|
for (let subI = 0; subI < sub.length; subI++) {
|
|
const next = sub[subI];
|
|
next.unshift(numArr[i]);
|
|
ret.push(next);
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}(m, nArr));
|
|
}
|
|
|
|
```
|
|
|
|
</section>
|