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53 lines
2.6 KiB
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53 lines
2.6 KiB
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<p data-end="128" data-start="0">给你一个长度为 <code data-end="51" data-start="48">n</code> 的整数数组 <code data-end="37" data-start="31">nums</code>。</p>
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<p data-end="128" data-start="0">如果存在索引 <code data-end="117" data-start="100">0 < p < q < n − 1</code>，使得数组满足以下条件，则称其为 <strong data-end="76" data-start="65">三段式数组（trionic）</strong>：</p>
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<ul>
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<li data-end="170" data-start="132"><code data-end="144" data-start="132">nums[0...p]</code> <strong>严格</strong> 递增，</li>
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<li data-end="211" data-start="173"><code data-end="185" data-start="173">nums[p...q]</code> <strong>严格</strong> 递减，</li>
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<li data-end="252" data-start="214"><code data-end="228" data-start="214">nums[q...n − 1]</code> <strong>严格</strong> 递增。</li>
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</ul>
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<p data-end="315" data-is-last-node="" data-is-only-node="" data-start="254">如果 <code data-end="277" data-start="271">nums</code> 是三段式数组，返回 <code data-end="267" data-start="261">true</code>；否则，返回 <code data-end="314" data-start="307">false</code>。</p>
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<p> </p>
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<p><strong class="example">示例 1:</strong></p>
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<div class="example-block">
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<p><strong>输入:</strong> <span class="example-io">nums = [1,3,5,4,2,6]</span></p>
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<p><strong>输出:</strong> <span class="example-io">true</span></p>
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<p><strong>解释:</strong></p>
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<p>选择 <code data-end="91" data-start="84">p = 2</code>, <code data-end="100" data-start="93">q = 4</code>：</p>
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<ul>
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<li><code data-end="130" data-start="108">nums[0...2] = [1, 3, 5]</code> 严格递增 (<code data-end="166" data-start="155">1 < 3 < 5</code>)。</li>
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<li><code data-end="197" data-start="175">nums[2...4] = [5, 4, 2]</code> 严格递减 (<code data-end="233" data-start="222">5 > 4 > 2</code>)。</li>
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<li><code data-end="262" data-start="242">nums[4...5] = [2, 6]</code> 严格递增 (<code data-end="294" data-start="287">2 < 6</code>)。</li>
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</ul>
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</div>
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<p><strong class="example">示例 2:</strong></p>
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<div class="example-block">
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<p><strong>输入:</strong> <span class="example-io">nums = [2,1,3]</span></p>
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<p><strong>输出:</strong> <span class="example-io">false</span></p>
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<p><strong>解释:</strong></p>
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<p>无法选出能使数组满足三段式要求的 <code>p</code> 和 <code>q</code> 。</p>
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</div>
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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 data-end="41" data-start="26"><code data-end="39" data-start="26">3 <= n <= 100</code></li>
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<li data-end="70" data-start="44"><code data-end="70" data-start="44">-1000 <= nums[i] <= 1000</code></li>
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</ul>
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