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Subject: [PATCH] Create README - LeetHub

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+<h2><a href="https://leetcode.com/problems/count-good-nodes-in-binary-tree/?envType=study-plan-v2&envId=leetcode-75">1544. Count Good Nodes in Binary Tree</a></h2><h3>Medium</h3><hr><p>Given a binary tree <code>root</code>, a node <em>X</em> in the tree is named&nbsp;<strong>good</strong> if in the path from root to <em>X</em> there are no nodes with a value <em>greater than</em> X.</p>
+
+<p>Return the number of <strong>good</strong> nodes in the binary tree.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<p><strong><img alt="" src="https://assets.leetcode.com/uploads/2020/04/02/test_sample_1.png" style="width: 263px; height: 156px;" /></strong></p>
+
+<pre>
+<strong>Input:</strong> root = [3,1,4,3,null,1,5]
+<strong>Output:</strong> 4
+<strong>Explanation:</strong> Nodes in blue are <strong>good</strong>.
+Root Node (3) is always a good node.
+Node 4 -&gt; (3,4) is the maximum value in the path starting from the root.
+Node 5 -&gt; (3,4,5) is the maximum value in the path
+Node 3 -&gt; (3,1,3) is the maximum value in the path.</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<p><strong><img alt="" src="https://assets.leetcode.com/uploads/2020/04/02/test_sample_2.png" style="width: 157px; height: 161px;" /></strong></p>
+
+<pre>
+<strong>Input:</strong> root = [3,3,null,4,2]
+<strong>Output:</strong> 3
+<strong>Explanation:</strong> Node 2 -&gt; (3, 3, 2) is not good, because &quot;3&quot; is higher than it.</pre>
+
+<p><strong class="example">Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> root = [1]
+<strong>Output:</strong> 1
+<strong>Explanation:</strong> Root is considered as <strong>good</strong>.</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in the binary tree is in the range&nbsp;<code>[1, 10^5]</code>.</li>
+	<li>Each node&#39;s value is between <code>[-10^4, 10^4]</code>.</li>
+</ul>
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