leetcode-problemset/leetcode-cn/originData/check-if-n-and-its-double-exist.json

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            "questionId": "1468",
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            "title": "Check If N and Its Double Exist",
            "titleSlug": "check-if-n-and-its-double-exist",
            "content": "<p>Given an array <code>arr</code> of integers, check if there exist two indices <code>i</code> and <code>j</code> such that :</p>\n\n<ul>\n\t<li><code>i != j</code></li>\n\t<li><code>0 &lt;= i, j &lt; arr.length</code></li>\n\t<li><code>arr[i] == 2 * arr[j]</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> arr = [10,2,5,3]\n<strong>Output:</strong> true\n<strong>Explanation:</strong> For i = 0 and j = 2, arr[i] == 10 == 2 * 5 == 2 * arr[j]\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> arr = [3,1,7,11]\n<strong>Output:</strong> false\n<strong>Explanation:</strong> There is no i and j that satisfy the conditions.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= arr.length &lt;= 500</code></li>\n\t<li><code>-10<sup>3</sup> &lt;= arr[i] &lt;= 10<sup>3</sup></code></li>\n</ul>\n",
            "translatedTitle": "检查整数及其两倍数是否存在",
            "translatedContent": "<p>给你一个整数数组&nbsp;<code>arr</code>，请你检查是否存在两个整数&nbsp;<code>N</code> 和 <code>M</code>，满足&nbsp;<code>N</code>&nbsp;是&nbsp;<code>M</code>&nbsp;的两倍（即，<code>N = 2 * M</code>）。</p>\n\n<p>更正式地，检查是否存在两个下标&nbsp;<code>i</code> 和 <code>j</code> 满足：</p>\n\n<ul>\n\t<li><code>i != j</code></li>\n\t<li><code>0 &lt;= i, j &lt; arr.length</code></li>\n\t<li><code>arr[i] == 2 * arr[j]</code></li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre><strong>输入：</strong>arr = [10,2,5,3]\n<strong>输出：</strong>true\n<strong>解释：</strong>N<code> = 10</code> 是 M<code> = 5 的两倍</code>，即 <code>10 = 2 * 5 。</code>\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre><strong>输入：</strong>arr = [7,1,14,11]\n<strong>输出：</strong>true\n<strong>解释：</strong>N<code> = 14</code> 是 M<code> = 7 的两倍</code>，即 <code>14 = 2 * 7 </code>。\n</pre>\n\n<p><strong>示例 3：</strong></p>\n\n<pre><strong>输入：</strong>arr = [3,1,7,11]\n<strong>输出：</strong>false\n<strong>解释：</strong>在该情况下不存在 N 和 M 满足 N = 2 * M 。\n</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>2 &lt;= arr.length &lt;= 500</code></li>\n\t<li><code>-10^3 &lt;= arr[i] &lt;= 10^3</code></li>\n</ul>\n",
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                "Loop from i = 0 to arr.length, maintaining in a hashTable the array elements from [0, i - 1].",
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