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38 lines
1.2 KiB
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38 lines
1.2 KiB
HTML
<p>给你一个整数数组 <code>arr</code> 和一个整数 <code>difference</code>，请你找出并返回 <code>arr</code> 中最长等差子序列的长度，该子序列中相邻元素之间的差等于 <code>difference</code> 。</p>
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<p><strong>子序列</strong> 是指在不改变其余元素顺序的情况下，通过删除一些元素或不删除任何元素而从 <code>arr</code> 派生出来的序列。</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>arr = [1,2,3,4], difference = 1
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<strong>输出：</strong>4
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<strong>解释：</strong>最长的等差子序列是 [1,2,3,4]。</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>arr = [1,3,5,7], difference = 1
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<strong>输出：</strong>1
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<strong>解释：</strong>最长的等差子序列是任意单个元素。
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre>
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<strong>输入：</strong>arr = [1,5,7,8,5,3,4,2,1], difference = -2
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<strong>输出：</strong>4
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<strong>解释：</strong>最长的等差子序列是 [7,5,3,1]。
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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 <= arr.length <= 10<sup>5</sup></code></li>
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<li><code>-10<sup>4</sup> <= arr[i], difference <= 10<sup>4</sup></code></li>
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</ul>
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