add leetcode problem-cn part1

算法题（国内版）/problem (English)/根到叶路径上的不足节点(English) [insufficient-nodes-in-root-to-leaf-paths].html

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+<p>Given the <code>root</code> of a binary tree and an integer <code>limit</code>, delete all <strong>insufficient nodes</strong> in the tree simultaneously, and return <em>the root of the resulting binary tree</em>.</p>
+
+<p>A node is <strong>insufficient</strong> if every root to <strong>leaf</strong> path intersecting this node has a sum strictly less than <code>limit</code>.</p>
+
+<p>A <strong>leaf</strong> is a node with no children.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2019/06/05/insufficient-11.png" style="width: 500px; height: 207px;" />
+<pre>
+<strong>Input:</strong> root = [1,2,3,4,-99,-99,7,8,9,-99,-99,12,13,-99,14], limit = 1
+<strong>Output:</strong> [1,2,3,4,null,null,7,8,9,null,14]
+</pre>
+
+<p><strong>Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2019/06/05/insufficient-3.png" style="width: 400px; height: 274px;" />
+<pre>
+<strong>Input:</strong> root = [5,4,8,11,null,17,4,7,1,null,null,5,3], limit = 22
+<strong>Output:</strong> [5,4,8,11,null,17,4,7,null,null,null,5]
+</pre>
+
+<p><strong>Example 3:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2019/06/11/screen-shot-2019-06-11-at-83301-pm.png" style="width: 250px; height: 199px;" />
+<pre>
+<strong>Input:</strong> root = [1,2,-3,-5,null,4,null], limit = -1
+<strong>Output:</strong> [1,null,-3,4]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li>The number of nodes in the tree is in the range <code>[1, 5000]</code>.</li>
+	<li><code>-10<sup>5</sup> &lt;= Node.val &lt;= 10<sup>5</sup></code></li>
+	<li><code>-10<sup>9</sup> &lt;= limit &lt;= 10<sup>9</sup></code></li>
+</ul>