coder-xiaomo/leetcode-problemset
1
0
Fork 0
mirror of https://gitee.com/coder-xiaomo/leetcode-problemset synced 2025-09-05 15:31:43 +08:00
Code Issues Projects Releases Wiki Activity GitHub Gitee

update

Browse Source
This commit is contained in:
小墨
2024-02-19 15:29:53 +08:00
parent 6bfbd3556c
commit 5028bd771c
70 changed files with 21089 additions and 14223 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
leetcode/problem/apply-operations-to-make-string-empty.html Normal file
View File

@@ -0,0 +1,44 @@
<p>You are given a string <code>s</code>.</p>
<p>Consider performing the following operation until <code>s</code> becomes <strong>empty</strong>:</p>
<ul>
<li>For <strong>every</strong> alphabet character from <code>&#39;a&#39;</code> to <code>&#39;z&#39;</code>, remove the <strong>first</strong> occurrence of that character in <code>s</code> (if it exists).</li>
</ul>
<p>For example, let initially <code>s = &quot;aabcbbca&quot;</code>. We do the following operations:</p>
<ul>
<li>Remove the underlined characters <code>s = &quot;<u><strong>a</strong></u>a<strong><u>bc</u></strong>bbca&quot;</code>. The resulting string is <code>s = &quot;abbca&quot;</code>.</li>
<li>Remove the underlined characters <code>s = &quot;<u><strong>ab</strong></u>b<u><strong>c</strong></u>a&quot;</code>. The resulting string is <code>s = &quot;ba&quot;</code>.</li>
<li>Remove the underlined characters <code>s = &quot;<u><strong>ba</strong></u>&quot;</code>. The resulting string is <code>s = &quot;&quot;</code>.</li>
</ul>
<p>Return <em>the value of the string </em><code>s</code><em> right <strong>before</strong> applying the <strong>last</strong> operation</em>. In the example above, answer is <code>&quot;ba&quot;</code>.</p>
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;aabcbbca&quot;
<strong>Output:</strong> &quot;ba&quot;
<strong>Explanation:</strong> Explained in the statement.
</pre>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;abcd&quot;
<strong>Output:</strong> &quot;abcd&quot;
<strong>Explanation:</strong> We do the following operation:
- Remove the underlined characters s = &quot;<u><strong>abcd</strong></u>&quot;. The resulting string is s = &quot;&quot;.
The string just before the last operation is &quot;abcd&quot;.
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>1 &lt;= s.length &lt;= 5 * 10<sup>5</sup></code></li>
<li><code>s</code> consists only of lowercase English letters.</li>
</ul>