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41 lines
1.4 KiB
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41 lines
1.4 KiB
HTML
<p>给你一个下标从 <strong>0</strong> 开始、<strong>严格递增</strong> 的整数数组 <code>nums</code> 和一个正整数 <code>diff</code> 。如果满足下述全部条件，则三元组 <code>(i, j, k)</code> 就是一个 <strong>算术三元组</strong> ：</p>
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<ul>
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<li><code>i < j < k</code> ，</li>
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<li><code>nums[j] - nums[i] == diff</code> 且</li>
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<li><code>nums[k] - nums[j] == diff</code></li>
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</ul>
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<p>返回不同 <strong>算术三元组</strong> 的数目<em>。</em></p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<pre><strong>输入：</strong>nums = [0,1,4,6,7,10], diff = 3
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<strong>输出：</strong>2
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<strong>解释：</strong>
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(1, 2, 4) 是算术三元组：7 - 4 == 3 且 4 - 1 == 3 。
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(2, 4, 5) 是算术三元组：10 - 7 == 3 且 7 - 4 == 3 。
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre><strong>输入：</strong>nums = [4,5,6,7,8,9], diff = 2
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<strong>输出：</strong>2
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<strong>解释：</strong>
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(0, 2, 4) 是算术三元组：8 - 6 == 2 且 6 - 4 == 2 。
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(1, 3, 5) 是算术三元组：9 - 7 == 2 且 7 - 5 == 2 。
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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>3 <= nums.length <= 200</code></li>
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<li><code>0 <= nums[i] <= 200</code></li>
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<li><code>1 <= diff <= 50</code></li>
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<li><code>nums</code> <strong>严格</strong> 递增</li>
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</ul>
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