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leetcode-problemset/leetcode-cn/originData/count-distinct-numbers-on-board.json
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"question": {
"questionId": "2679",
"questionFrontendId": "2549",
"categoryTitle": "Algorithms",
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"title": "Count Distinct Numbers on Board",
"titleSlug": "count-distinct-numbers-on-board",
"content": "<p>You are given a positive integer <code>n</code>, that is initially placed on a board. Every day, for <code>10<sup>9</sup></code> days, you perform the following procedure:</p>\n\n<ul>\n\t<li>For each number <code>x</code> present on the board, find all numbers <code>1 &lt;= i &lt;= n</code> such that <code>x % i == 1</code>.</li>\n\t<li>Then, place those numbers on the board.</li>\n</ul>\n\n<p>Return<em> the number of <strong>distinct</strong> integers present on the board after</em> <code>10<sup>9</sup></code> <em>days have elapsed</em>.</p>\n\n<p><strong>Note:</strong></p>\n\n<ul>\n\t<li>Once a number is placed on the board, it will remain on it until the end.</li>\n\t<li><code>%</code>&nbsp;stands&nbsp;for the modulo operation. For example,&nbsp;<code>14 % 3</code> is <code>2</code>.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 5\n<strong>Output:</strong> 4\n<strong>Explanation:</strong> Initially, 5 is present on the board. \nThe next day, 2 and 4 will be added since 5 % 2 == 1 and 5 % 4 == 1. \nAfter that day, 3 will be added to the board because 4 % 3 == 1. \nAt the end of a billion days, the distinct numbers on the board will be 2, 3, 4, and 5. \n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> n = 3\n<strong>Output:</strong> 2\n<strong>Explanation:</strong> \nSince 3 % 2 == 1, 2 will be added to the board. \nAfter a billion days, the only two distinct numbers on the board are 2 and 3. \n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 100</code></li>\n</ul>\n",
"translatedTitle": "统计桌é<C592>¢ä¸Šçš„ä¸<C3A4>å<EFBFBD>Œæ•°å­—",
"translatedContent": "<p>给你一个正整数 <code>n</code> ,开å§æ—¶ï¼Œå®ƒæ”¾åœ¨æ¡Œé<C592>¢ä¸Šã€åœ¨ <code>10<sup>9</sup></code> 天内,æ¯<C3A6>天都è¦<C3A8>执行ä¸è¿°æ­¥éª¤ï¼š</p>\n\n<ul>\n\t<li>对于出现在桌é<C592>¢ä¸Šçš„æ¯<C3A6>个数字 <code>x</code> ,找出符å<C2A6>ˆ <code>1 &lt;= i &lt;= n</code> 且满足 <code>x % i == 1</code> 的所有数字 <code>i</code> 。</li>\n\t<li>然å<C2B6>Žï¼Œå°†è¿™äºæ•°å­—放在桌é<C592>¢ä¸Šã€</li>\n</ul>\n\n<p>返回在 <code>10<sup>9</sup></code> 天ä¹å<E280B9>Žï¼Œå‡ºçŽ°åœ¨æ¡Œé<C592>¢ä¸Šçš„ <strong>ä¸<C3A4>å<EFBFBD>Œ</strong> 整数的数目。</p>\n\n<p><strong>注æ„<C3A6>:</strong></p>\n\n<ul>\n\t<li>一旦数字放在桌é<C592>¢ä¸Šï¼Œåˆ™ä¼šä¸€ç´ä¿<C3A4>ç•™ç´åˆ°ç»“æ<E2809C>Ÿã€</li>\n\t<li><code>%</code> 表示å<C2BA>ä½™è¿<C3A8>ç®—ã€ä¾å¦ï¼Œ<code>14 % 3</code> 等于 <code>2</code> 。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 5\n<strong>输出:</strong>4\n<strong>解释:</strong>最开å§ï¼Œ5 在桌é<C592>¢ä¸Šã€ \n第二天,2 å’Œ 4 也出现在桌é<C592>¢ä¸Šï¼Œå ä¸º 5 % 2 == 1 且 5 % 4 == 1 。 \nå†<C3A5>过一天 3 也出现在桌é<C592>¢ä¸Šï¼Œå ä¸º 4 % 3 == 1 。 \n在å<C2A8><C3A5>亿天结æ<E2809C>Ÿæ—¶ï¼Œæ¡Œé<C592>¢ä¸Šçš„ä¸<C3A4>å<EFBFBD>Œæ•°å­—有 2 ã€<C3A3>3 ã€<C3A3>4 ã€<C3A3>5 。\n</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong>n = 3 \n<strong>输出:</strong>2\n<strong>解释:</strong> \nå ä¸º 3 % 2 == 1 ,2 也出现在桌é<C592>¢ä¸Šã€ \n在å<C2A8><C3A5>亿天结æ<E2809C>Ÿæ—¶ï¼Œæ¡Œé<C592>¢ä¸Šçš„ä¸<C3A4>å<EFBFBD>Œæ•°å­—å<E28094>ªæœ‰ä¸¤ä¸ªï¼š2 å’Œ 3 。 \n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>æ<><C3A6>示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= n &lt;= 100</code></li>\n</ul>\n",
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"hints": [
"For n > 2, n % (n - 1) == 1 thus n - 1 will be added on the board the next day.",
"As the operations are performed for so long time, all the numbers lesser than n except 1 will be added to the board.",
"What will happen if n == 1?"
],
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