mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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174 lines
16 KiB
JSON
174 lines
16 KiB
JSON
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"questionId": "2509",
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"title": "Minimize XOR",
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"content": "<p>Given two positive integers <code>num1</code> and <code>num2</code>, find the positive integer <code>x</code> such that:</p>\n\n<ul>\n\t<li><code>x</code> has the same number of set bits as <code>num2</code>, and</li>\n\t<li>The value <code>x XOR num1</code> is <strong>minimal</strong>.</li>\n</ul>\n\n<p>Note that <code>XOR</code> is the bitwise XOR operation.</p>\n\n<p>Return <em>the integer </em><code>x</code>. The test cases are generated such that <code>x</code> is <strong>uniquely determined</strong>.</p>\n\n<p>The number of <strong>set bits</strong> of an integer is the number of <code>1</code>'s in its binary representation.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> num1 = 3, num2 = 5\n<strong>Output:</strong> 3\n<strong>Explanation:</strong>\nThe binary representations of num1 and num2 are 0011 and 0101, respectively.\nThe integer <strong>3</strong> has the same number of set bits as num2, and the value <code>3 XOR 3 = 0</code> is minimal.\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> num1 = 1, num2 = 12\n<strong>Output:</strong> 3\n<strong>Explanation:</strong>\nThe binary representations of num1 and num2 are 0001 and 1100, respectively.\nThe integer <strong>3</strong> has the same number of set bits as num2, and the value <code>3 XOR 1 = 2</code> is minimal.\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= num1, num2 <= 10<sup>9</sup></code></li>\n</ul>\n",
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"exampleTestcases": "3\n5\n1\n12",
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"categoryTitle": "Algorithms",
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"code": "-spec minimize_xor(Num1 :: integer(), Num2 :: integer()) -> integer().\nminimize_xor(Num1, Num2) ->\n .",
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"To arrive at a small xor, try to turn off some bits from num1",
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"If there are still left bits to set, try to set them from the least significant bit"
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