mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
synced 2025-01-10 18:48:13 +08:00
36 lines
1.2 KiB
HTML
36 lines
1.2 KiB
HTML
<p>Given a <strong>0-indexed</strong> integer array <code>nums</code> of size <code>n</code> and two integers <code>lower</code> and <code>upper</code>, return <em>the number of fair pairs</em>.</p>
|
|
|
|
<p>A pair <code>(i, j)</code> is <b>fair </b>if:</p>
|
|
|
|
<ul>
|
|
<li><code>0 <= i < j < n</code>, and</li>
|
|
<li><code>lower <= nums[i] + nums[j] <= upper</code></li>
|
|
</ul>
|
|
|
|
<p> </p>
|
|
<p><strong class="example">Example 1:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong> nums = [0,1,7,4,4,5], lower = 3, upper = 6
|
|
<strong>Output:</strong> 6
|
|
<strong>Explanation:</strong> There are 6 fair pairs: (0,3), (0,4), (0,5), (1,3), (1,4), and (1,5).
|
|
</pre>
|
|
|
|
<p><strong class="example">Example 2:</strong></p>
|
|
|
|
<pre>
|
|
<strong>Input:</strong> nums = [1,7,9,2,5], lower = 11, upper = 11
|
|
<strong>Output:</strong> 1
|
|
<strong>Explanation:</strong> There is a single fair pair: (2,3).
|
|
</pre>
|
|
|
|
<p> </p>
|
|
<p><strong>Constraints:</strong></p>
|
|
|
|
<ul>
|
|
<li><code>1 <= nums.length <= 10<sup>5</sup></code></li>
|
|
<li><code>nums.length == n</code></li>
|
|
<li><code><font face="monospace">-10<sup>9</sup></font> <= nums[i] <= 10<sup>9</sup></code></li>
|
|
<li><code><font face="monospace">-10<sup>9</sup> <= lower <= upper <= 10<sup>9</sup></font></code></li>
|
|
</ul>
|