uncommon-words-from-two-sentences

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Algorithms

A sentence is a string of single-space separated words where each word consists only of lowercase letters.

A word is uncommon if it appears exactly once in one of the sentences, and does not appear in the other sentence.

Given two sentences <code>s1</code> and <code>s2</code>, return a list of all the uncommon words. You may return the answer in any order.

&nbsp;
Example 1:

<div class="example-block">
Input: s1 = &quot;this apple is sweet&quot;, s2 = &quot;this apple is sour&quot;

Output: [&quot;sweet&quot;,&quot;sour&quot;]

Explanation:

The word <code>&quot;sweet&quot;</code> appears only in <code>s1</code>, while the word <code>&quot;sour&quot;</code> appears only in <code>s2</code>.
</div>

Example 2:

<div class="example-block">
Input: s1 = &quot;apple apple&quot;, s2 = &quot;banana&quot;

Output: [&quot;banana&quot;]
</div>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= s1.length, s2.length &lt;= 200</code></li>
	<li><code>s1</code> and <code>s2</code> consist of lowercase English letters and spaces.</li>
	<li><code>s1</code> and <code>s2</code> do not have leading or trailing spaces.</li>
	<li>All the words in <code>s1</code> and <code>s2</code> are separated by a single space.</li>
</ul>

uncommonFromSentences

Uncommon Words from Two Sentences

Count Common Words With One Occurrence

count-common-words-with-one-occurrence

统计出现过一次的公共字符串

Hash Table

String

Counting

句子 是一串由空格分隔的单词。每个 单词 仅由小写字母组成。

如果某个单词在其中一个句子中恰好出现一次，在另一个句子中却 没有出现 ，那么这个单词就是 不常见的 。

给你两个 句子 <code>s1</code> 和 <code>s2</code> ，返回所有 不常用单词 的列表。返回列表中单词可以按 任意顺序 组织。

&nbsp;

<ol>
</ol>

示例 1：

<pre>
输入：s1 = "this apple is sweet", s2 = "this apple is sour"
输出：["sweet","sour"]
</pre>

示例 2：

<pre>
输入：s1 = "apple apple", s2 = "banana"
输出：["banana"]
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= s1.length, s2.length &lt;= 200</code></li>
	<li><code>s1</code> 和 <code>s2</code> 由小写英文字母和空格组成</li>
	<li><code>s1</code> 和 <code>s2</code> 都不含前导或尾随空格</li>
	<li><code>s1</code> 和 <code>s2</code> 中的所有单词间均由单个空格分隔</li>
</ul>