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41 lines
1.6 KiB
HTML
<p>Given the <code>root</code> of a binary tree and an integer <code>targetSum</code>, return <code>true</code> if the tree has a <strong>root-to-leaf</strong> path such that adding up all the values along the path equals <code>targetSum</code>.</p>
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<p>A <strong>leaf</strong> is a node with no children.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/01/18/pathsum1.jpg" style="width: 500px; height: 356px;" />
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<pre>
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<strong>Input:</strong> root = [5,4,8,11,null,13,4,7,2,null,null,null,1], targetSum = 22
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<strong>Output:</strong> true
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<strong>Explanation:</strong> The root-to-leaf path with the target sum is shown.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/01/18/pathsum2.jpg" />
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<pre>
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<strong>Input:</strong> root = [1,2,3], targetSum = 5
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<strong>Output:</strong> false
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<strong>Explanation:</strong> There two root-to-leaf paths in the tree:
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(1 --> 2): The sum is 3.
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(1 --> 3): The sum is 4.
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There is no root-to-leaf path with sum = 5.
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> root = [], targetSum = 0
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<strong>Output:</strong> false
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<strong>Explanation:</strong> Since the tree is empty, there are no root-to-leaf paths.
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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, 5000]</code>.</li>
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<li><code>-1000 <= Node.val <= 1000</code></li>
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<li><code>-1000 <= targetSum <= 1000</code></li>
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</ul>
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