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leetcode-cn/problem (Chinese)/回旋镖的数量 [number-of-boomerangs].html
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<p>给定平面上<em>&nbsp;</em><code>n</code><em> </em>对 <strong>互不相同</strong> 的点&nbsp;<code>points</code> ，其中 <code>points[i] = [x<sub>i</sub>, y<sub>i</sub>]</code> 。<strong>回旋镖</strong> 是由点&nbsp;<code>(i, j, k)</code> 表示的元组 ，其中&nbsp;<code>i</code>&nbsp;和&nbsp;<code>j</code>&nbsp;之间的距离和&nbsp;<code>i</code>&nbsp;和&nbsp;<code>k</code>&nbsp;之间的欧式距离相等（<strong>需要考虑元组的顺序</strong>）。</p>
<p>给定平面上<em>&nbsp;</em><code>n</code><em> </em>对 <strong>互不相同</strong> 的点&nbsp;<code>points</code> ，其中 <code>points[i] = [x<sub>i</sub>, y<sub>i</sub>]</code> 。<strong>回旋镖</strong> 是由点&nbsp;<code>(i, j, k)</code> 表示的元组 ，其中&nbsp;<code>i</code>&nbsp;和&nbsp;<code>j</code>&nbsp;之间的欧式距离和&nbsp;<code>i</code>&nbsp;和&nbsp;<code>k</code>&nbsp;之间的欧式距离相等（<strong>需要考虑元组的顺序</strong>）。</p>
<p>返回平面上所有回旋镖的数量。</p>
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