mirror of
https://github.com/freeCodeCamp/freeCodeCamp.git
synced 2026-04-11 16:00:12 -04:00
137 lines
2.2 KiB
Markdown
137 lines
2.2 KiB
Markdown
---
|
|
id: 594810f028c0303b75339acc
|
|
title: ABC 问题
|
|
challengeType: 1
|
|
forumTopicId: 302220
|
|
dashedName: abc-problem
|
|
---
|
|
|
|
# --description--
|
|
|
|
You are given a collection of ABC blocks (e.g., childhood alphabet blocks). There are 20 blocks with two letters on each block. A complete alphabet is guaranteed amongst all sides of the blocks. The sample collection of blocks:
|
|
|
|
<pre>(B O)
|
|
(X K)
|
|
(D Q)
|
|
(C P)
|
|
(N A)
|
|
(G T)
|
|
(R E)
|
|
(T G)
|
|
(Q D)
|
|
(F S)
|
|
(J W)
|
|
(H U)
|
|
(V I)
|
|
(A N)
|
|
(O B)
|
|
(E R)
|
|
(F S)
|
|
(L Y)
|
|
(P C)
|
|
(Z M)
|
|
</pre>
|
|
|
|
# --instructions--
|
|
|
|
实现一个函数，该函数接受一个字符串（单词），并确定该单词是否可以用给定的块集合拼写。
|
|
|
|
要记住的一些规则：
|
|
|
|
<ul>
|
|
<li>Once a letter on a block is used, that block cannot be used again.</li>
|
|
<li>该函数应该不区分大小写。</li>
|
|
</ul>
|
|
|
|
# --hints--
|
|
|
|
`canMakeWord` 应该是一个函数。
|
|
|
|
```js
|
|
assert(typeof canMakeWord === 'function');
|
|
```
|
|
|
|
`canMakeWord` 应该返回一个布尔值。
|
|
|
|
```js
|
|
assert(typeof canMakeWord('hi') === 'boolean');
|
|
```
|
|
|
|
`canMakeWord("bark")` 应该返回 true。
|
|
|
|
```js
|
|
assert(canMakeWord(words[0]));
|
|
```
|
|
|
|
`canMakeWord("BooK")` 应该返回 false。
|
|
|
|
```js
|
|
assert(!canMakeWord(words[1]));
|
|
```
|
|
|
|
`canMakeWord("TReAT")` 应该返回 true。
|
|
|
|
```js
|
|
assert(canMakeWord(words[2]));
|
|
```
|
|
|
|
`canMakeWord("COMMON")` should return false.
|
|
|
|
```js
|
|
assert(!canMakeWord(words[3]));
|
|
```
|
|
|
|
`canMakeWord("squAD")` 应该返回 true。
|
|
|
|
```js
|
|
assert(canMakeWord(words[4]));
|
|
```
|
|
|
|
`canMakeWord("conFUSE")` 应该返回 true。
|
|
|
|
```js
|
|
assert(canMakeWord(words[5]));
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --after-user-code--
|
|
|
|
```js
|
|
const words = ['bark', 'BooK', 'TReAT', 'COMMON', 'squAD', 'conFUSE'];
|
|
```
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
function canMakeWord(word) {
|
|
|
|
}
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
function canMakeWord(word) {
|
|
const characters = 'BO XK DQ CP NA GT RE TG QD FS JW HU VI AN OB ER FS LY PC ZM';
|
|
const blocks = characters.split(' ').map(pair => pair.split(''));
|
|
|
|
const letters = [...word.toUpperCase()];
|
|
let length = letters.length;
|
|
const copy = new Set(blocks);
|
|
|
|
letters.forEach(letter => {
|
|
for (let block of copy) {
|
|
const index = block.indexOf(letter);
|
|
|
|
if (index !== -1) {
|
|
length--;
|
|
copy.delete(block);
|
|
break;
|
|
}
|
|
}
|
|
});
|
|
return !length;
|
|
}
|
|
```
|