40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
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<p>如果一个数列 <strong>至少有三个元素</strong> ，并且任意两个相邻元素之差相同，则称该数列为等差数列。</p>
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<ul>
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<li>例如，<code>[1,3,5,7,9]</code>、<code>[7,7,7,7]</code> 和 <code>[3,-1,-5,-9]</code> 都是等差数列。</li>
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</ul>
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<div class="original__bRMd">
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<div>
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<p>给你一个整数数组 <code>nums</code> ，返回数组 <code>nums</code> 中所有为等差数组的 <strong>子数组</strong> 个数。</p>
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<p><strong>子数组</strong> 是数组中的一个连续序列。</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>nums = [1,2,3,4]
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<strong>输出：</strong>3
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<strong>解释：</strong>nums 中有三个子等差数组：[1, 2, 3]、[2, 3, 4] 和 [1,2,3,4] 自身。
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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>nums = [1]
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<strong>输出：</strong>0
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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 <= nums.length <= 5000</code></li>
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<li><code>-1000 <= nums[i] <= 1000</code></li>
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</ul>
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</div>
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</div>
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<div><div>Related Topics</div><div><li>数组</li><li>动态规划</li></div></div>\n<div><li>👍 309</li><li>👎 0</li></div>
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