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0020-valid-parentheses/README.md

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+<h2><a href="https://leetcode.com/problems/valid-parentheses">20. Valid Parentheses</a></h2><h3>Easy</h3><hr><p>Given a string <code>s</code> containing just the characters <code>&#39;(&#39;</code>, <code>&#39;)&#39;</code>, <code>&#39;{&#39;</code>, <code>&#39;}&#39;</code>, <code>&#39;[&#39;</code> and <code>&#39;]&#39;</code>, determine if the input string is valid.</p>
+
+<p>An input string is valid if:</p>
+
+<ol>
+<li>Open brackets must be closed by the same type of brackets.</li>
+<li>Open brackets must be closed in the correct order.</li>
+<li>Every close bracket has a corresponding open bracket of the same type.</li>
+</ol>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;()&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">true</span></p>
+</div>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;()[]{}&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">true</span></p>
+</div>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;(]&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">false</span></p>
+</div>
+
+<p><strong class="example">Example 4:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;([])&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">true</span></p>
+</div>
+
+<p><strong class="example">Example 5:</strong></p>
+
+<div class="example-block">
+<p><strong>Input:</strong> <span class="example-io">s = &quot;([)]&quot;</span></p>
+
+<p><strong>Output:</strong> <span class="example-io">false</span></p>
+</div>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+<li><code>1 &lt;= s.length &lt;= 10<sup>4</sup></code></li>
+<li><code>s</code> consists of parentheses only <code>&#39;()[]{}&#39;</code>.</li>
+</ul>