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34 lines
1.2 KiB
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34 lines
1.2 KiB
HTML
<p>Given two integer arrays <code>pushed</code> and <code>popped</code> each with distinct values, return <code>true</code><em> if this could have been the result of a sequence of push and pop operations on an initially empty stack, or </em><code>false</code><em> otherwise.</em></p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> pushed = [1,2,3,4,5], popped = [4,5,3,2,1]
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<strong>Output:</strong> true
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<strong>Explanation:</strong> We might do the following sequence:
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push(1), push(2), push(3), push(4),
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pop() -> 4,
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push(5),
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pop() -> 5, pop() -> 3, pop() -> 2, pop() -> 1
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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> pushed = [1,2,3,4,5], popped = [4,3,5,1,2]
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<strong>Output:</strong> false
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<strong>Explanation:</strong> 1 cannot be popped before 2.
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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><code>1 <= pushed.length <= 1000</code></li>
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<li><code>0 <= pushed[i] <= 1000</code></li>
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<li>All the elements of <code>pushed</code> are <strong>unique</strong>.</li>
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<li><code>popped.length == pushed.length</code></li>
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<li><code>popped</code> is a permutation of <code>pushed</code>.</li>
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</ul>
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