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			1.6 KiB
		
	
	
	
		
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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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