word-break

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Algorithms

Given a string <code>s</code> and a dictionary of strings <code>wordDict</code>, return <code>true</code> if <code>s</code> can be segmented into a space-separated sequence of one or more dictionary words.

Note that the same word in the dictionary may be reused multiple times in the segmentation.

&nbsp;
Example 1:

<pre>
Input: s = &quot;leetcode&quot;, wordDict = [&quot;leet&quot;,&quot;code&quot;]
Output: true
Explanation: Return true because &quot;leetcode&quot; can be segmented as &quot;leet code&quot;.
</pre>

Example 2:

<pre>
Input: s = &quot;applepenapple&quot;, wordDict = [&quot;apple&quot;,&quot;pen&quot;]
Output: true
Explanation: Return true because &quot;applepenapple&quot; can be segmented as &quot;apple pen apple&quot;.
Note that you are allowed to reuse a dictionary word.
</pre>

Example 3:

<pre>
Input: s = &quot;catsandog&quot;, wordDict = [&quot;cats&quot;,&quot;dog&quot;,&quot;sand&quot;,&quot;and&quot;,&quot;cat&quot;]
Output: false
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= s.length &lt;= 300</code></li>
	<li><code>1 &lt;= wordDict.length &lt;= 1000</code></li>
	<li><code>1 &lt;= wordDict[i].length &lt;= 20</code></li>
	<li><code>s</code> and <code>wordDict[i]</code> consist of only lowercase English letters.</li>
	<li>All the strings of <code>wordDict</code> are unique.</li>
</ul>

wordBreak

Word Break

Word Break II

word-break-ii

单词拆分 II

Extra Characters in a String

extra-characters-in-a-string

字符串中的额外字符

Trie

Memoization

Array

Hash Table

String

Dynamic Programming

给你一个字符串 <code>s</code> 和一个字符串列表 <code>wordDict</code> 作为字典。如果可以利用字典中出现的一个或多个单词拼接出 <code>s</code>&nbsp;则返回 <code>true</code>。

注意：不要求字典中出现的单词全部都使用，并且字典中的单词可以重复使用。

&nbsp;

示例 1：

<pre>
输入: s = "leetcode", wordDict = ["leet", "code"]
输出: true
解释: 返回 true 因为 "leetcode" 可以由 "leet" 和 "code" 拼接成。
</pre>

示例 2：

<pre>
输入: s = "applepenapple", wordDict = ["apple", "pen"]
输出: true
解释: 返回 true 因为 "applepenapple" 可以由 "apple" "pen" "apple" 拼接成。
&nbsp; 注意，你可以重复使用字典中的单词。
</pre>

示例 3：

<pre>
输入: s = "catsandog", wordDict = ["cats", "dog", "sand", "and", "cat"]
输出: false
</pre>

&nbsp;

提示：

<ul>
	<li><code>1 &lt;= s.length &lt;= 300</code></li>
	<li><code>1 &lt;= wordDict.length &lt;= 1000</code></li>
	<li><code>1 &lt;= wordDict[i].length &lt;= 20</code></li>
	<li><code>s</code> 和 <code>wordDict[i]</code> 仅由小写英文字母组成</li>
	<li><code>wordDict</code> 中的所有字符串 互不相同</li>
</ul>