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"translatedContent": "<p>给你四个整数:<code>n</code> 、<code>a</code> 、<code>b</code> 、<code>c</code> ,请你设计一个算法来找出第 <code>n</code> 个丑数。</p>\n\n<p>丑数是可以被 <code>a</code> <strong>或</strong> <code>b</code> <strong>或</strong> <code>c</code> 整除的 <strong>正整数</strong> 。</p>\n\n<p> </p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 3, a = 2, b = 3, c = 5\n<strong>输出:</strong>4\n<strong>解释:</strong>丑数序列为 2, 3, 4, 5, 6, 8, 9, 10... 其中第 3 个是 4。</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 4, a = 2, b = 3, c = 4\n<strong>输出:</strong>6\n<strong>解释:</strong>丑数序列为 2, 3, 4, 6, 8, 9, 10, 12... 其中第 4 个是 6。\n</pre>\n\n<p><strong>示例 3:</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 5, a = 2, b = 11, c = 13\n<strong>输出:</strong>10\n<strong>解释:</strong>丑数序列为 2, 4, 6, 8, 10, 11, 12, 13... 其中第 5 个是 10。\n</pre>\n\n<p><strong>示例 4:</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 1000000000, a = 2, b = 217983653, c = 336916467\n<strong>输出:</strong>1999999984\n</pre>\n\n<p> </p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 <= n, a, b, c <= 10^9</code></li>\n\t<li><code>1 <= a * b * c <= 10^18</code></li>\n\t<li>本题结果在 <code>[1, 2 * 10^9]</code> 的范围内</li>\n</ul>\n",
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"Write a function f(k) to determine how many ugly numbers smaller than k. As f(k) is non-decreasing, try binary search.",
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"Find all ugly numbers in [1, LCM(a, b, c)] (LCM is Least Common Multiple). Use inclusion-exclusion principle to expand the result."
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