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29 lines
1.1 KiB
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29 lines
1.1 KiB
HTML
<p>Given the <code>root</code> of a binary tree and an integer <code>targetSum</code>, return <em>the number of paths where the sum of the values along the path equals</em> <code>targetSum</code>.</p>
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<p>The path does not need to start or end at the root or a leaf, but it must go downwards (i.e., traveling only from parent nodes to child nodes).</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/04/09/pathsum3-1-tree.jpg" style="width: 450px; height: 386px;" />
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<pre>
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<strong>Input:</strong> root = [10,5,-3,3,2,null,11,3,-2,null,1], targetSum = 8
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> The paths that sum to 8 are shown.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> root = [5,4,8,11,null,13,4,7,2,null,null,5,1], targetSum = 22
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<strong>Output:</strong> 3
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li>The number of nodes in the tree is in the range <code>[0, 1000]</code>.</li>
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<li><code>-10<sup>9</sup> <= Node.val <= 10<sup>9</sup></code></li>
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<li><code>-1000 <= targetSum <= 1000</code></li>
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</ul>
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