43 lines
1.7 KiB
Markdown
43 lines
1.7 KiB
Markdown
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<p>给你一个整数数组 <code>nums</code> （下标 <strong>从 0 开始</strong> 计数）以及两个整数：<code>low</code> 和 <code>high</code> ，请返回 <strong>漂亮数对</strong> 的数目。</p>
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<p><strong>漂亮数对</strong> 是一个形如 <code>(i, j)</code> 的数对，其中 <code>0 <= i < j < nums.length</code> 且 <code>low <= (nums[i] XOR nums[j]) <= high</code> 。</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 = [1,4,2,7], low = 2, high = 6
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<strong>输出：</strong>6
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<strong>解释：</strong>所有漂亮数对 (i, j) 列出如下：
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- (0, 1): nums[0] XOR nums[1] = 5
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- (0, 2): nums[0] XOR nums[2] = 3
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- (0, 3): nums[0] XOR nums[3] = 6
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- (1, 2): nums[1] XOR nums[2] = 6
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- (1, 3): nums[1] XOR nums[3] = 3
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- (2, 3): nums[2] XOR nums[3] = 5
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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 = [9,8,4,2,1], low = 5, high = 14
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<strong>输出：</strong>8
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<strong>解释：</strong>所有漂亮数对 (i, j) 列出如下：
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- (0, 2): nums[0] XOR nums[2] = 13
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- (0, 3): nums[0] XOR nums[3] = 11
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- (0, 4): nums[0] XOR nums[4] = 8
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- (1, 2): nums[1] XOR nums[2] = 12
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- (1, 3): nums[1] XOR nums[3] = 10
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- (1, 4): nums[1] XOR nums[4] = 9
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- (2, 3): nums[2] XOR nums[3] = 6
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- (2, 4): nums[2] XOR nums[4] = 5</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 <= 2 * 10<sup>4</sup></code></li>
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<li><code>1 <= nums[i] <= 2 * 10<sup>4</sup></code></li>
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<li><code>1 <= low <= high <= 2 * 10<sup>4</sup></code></li>
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</ul>
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<div><div>Related Topics</div><div><li>字典树</li></div></div>\n<div><li>👍 40</li><li>👎 0</li></div>
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