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34 lines
1.2 KiB
HTML
34 lines
1.2 KiB
HTML
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<p>给定 <code>pushed</code> 和 <code>popped</code> 两个序列，每个序列中的 <strong>值都不重复</strong>，只有当它们可能是在最初空栈上进行的推入 push 和弹出 pop 操作序列的结果时，返回 <code>true</code>；否则，返回 <code>false</code> 。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>pushed = [1,2,3,4,5], popped = [4,5,3,2,1]
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<strong>输出：</strong>true
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<strong>解释：</strong>我们可以按以下顺序执行：
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push(1), push(2), push(3), push(4), pop() -> 4,
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push(5), pop() -> 5, pop() -> 3, pop() -> 2, pop() -> 1
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>pushed = [1,2,3,4,5], popped = [4,3,5,1,2]
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<strong>输出：</strong>false
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<strong>解释：</strong>1 不能在 2 之前弹出。
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</pre>
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<p> </p>
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<p><strong>提示：</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><code>pushed</code> 的所有元素 <strong>互不相同</strong></li>
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<li><code>popped.length == pushed.length</code></li>
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<li><code>popped</code> 是 <code>pushed</code> 的一个排列</li>
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</ul>
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