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<p>给定一棵二叉树,其中每个节点都含有一个整数数值(该值或正或负)。设计一个算法,打印节点数值总和等于某个给定值的所有路径的数量。注意,路径不一定非得从二叉树的根节点或叶节点开始或结束,但是其方向必须向下(只能从父节点指向子节点方向)。</p>
<p><strong>示例:</strong><br>
<p><strong>示例</strong><br />
给定如下二叉树,以及目标和&nbsp;<code>sum = 22</code></p>
<pre> 5
<pre>
5
/ \
4 8
/ / \
@@ -12,9 +13,10 @@
7 2 5 1
</pre>
<p>返回:</p>
<p>输出:</p>
<pre>3
<pre>
3
<strong>解释:</strong>和为 22&nbsp;的路径有:[5,4,11,2], [5,8,4,5], [4,11,7]</pre>
<p>提示:</p>