leetcode-problemset/leetcode-cn/originData/random-pick-index.json

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        "question": {
            "questionId": "398",
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            "categoryTitle": "Algorithms",
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            "title": "Random Pick Index",
            "titleSlug": "random-pick-index",
            "content": "<p>Given an integer array <code>nums</code> with possible <strong>duplicates</strong>, randomly output the index of a given <code>target</code> number. You can assume that the given target number must exist in the array.</p>\n\n<p>Implement the <code>Solution</code> class:</p>\n\n<ul>\n\t<li><code>Solution(int[] nums)</code> Initializes the object with the array <code>nums</code>.</li>\n\t<li><code>int pick(int target)</code> Picks a random index <code>i</code> from <code>nums</code> where <code>nums[i] == target</code>. If there are multiple valid i&#39;s, then each index should have an equal probability of returning.</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[&quot;Solution&quot;, &quot;pick&quot;, &quot;pick&quot;, &quot;pick&quot;]\n[[[1, 2, 3, 3, 3]], [3], [1], [3]]\n<strong>Output</strong>\n[null, 4, 0, 2]\n\n<strong>Explanation</strong>\nSolution solution = new Solution([1, 2, 3, 3, 3]);\nsolution.pick(3); // It should return either index 2, 3, or 4 randomly. Each index should have equal probability of returning.\nsolution.pick(1); // It should return 0. Since in the array only nums[0] is equal to 1.\nsolution.pick(3); // It should return either index 2, 3, or 4 randomly. Each index should have equal probability of returning.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 2 * 10<sup>4</sup></code></li>\n\t<li><code>-2<sup>31</sup> &lt;= nums[i] &lt;= 2<sup>31</sup> - 1</code></li>\n\t<li><code>target</code> is an integer from <code>nums</code>.</li>\n\t<li>At most <code>10<sup>4</sup></code> calls will be made to <code>pick</code>.</li>\n</ul>\n",
            "translatedTitle": "随机数索引",
            "translatedContent": "<p>给你一个可能含有 <strong>重复元素</strong> 的整数数组&nbsp;<code>nums</code> ，请你随机输出给定的目标数字&nbsp;<code>target</code> 的索引。你可以假设给定的数字一定存在于数组中。</p>\n\n<p>实现 <code>Solution</code> 类：</p>\n\n<ul>\n\t<li><code>Solution(int[] nums)</code> 用数组 <code>nums</code> 初始化对象。</li>\n\t<li><code>int pick(int target)</code> 从 <code>nums</code> 中选出一个满足 <code>nums[i] == target</code> 的随机索引 <code>i</code> 。如果存在多个有效的索引，则每个索引的返回概率应当相等。</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><strong>示例：</strong></p>\n\n<pre>\n<strong>输入</strong>\n[\"Solution\", \"pick\", \"pick\", \"pick\"]\n[[[1, 2, 3, 3, 3]], [3], [1], [3]]\n<strong>输出</strong>\n[null, 4, 0, 2]\n\n<strong>解释</strong>\nSolution solution = new Solution([1, 2, 3, 3, 3]);\nsolution.pick(3); // 随机返回索引 2, 3 或者 4 之一。每个索引的返回概率应该相等。\nsolution.pick(1); // 返回 0 。因为只有 nums[0] 等于 1 。\nsolution.pick(3); // 随机返回索引 2, 3 或者 4 之一。每个索引的返回概率应该相等。\n</pre>\n\n<p>&nbsp;</p>\n\n<div class=\"top-view__1vxA\">\n<div class=\"original__bRMd\">\n<div>\n<p><strong>提示：</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= nums.length &lt;= 2 * 10<sup>4</sup></code></li>\n\t<li><code>-2<sup>31</sup> &lt;= nums[i] &lt;= 2<sup>31</sup> - 1</code></li>\n\t<li><code>target</code> 是 <code>nums</code> 中的一个整数</li>\n\t<li>最多调用 <code>pick</code> 函数 <code>10<sup>4</sup></code> 次</li>\n</ul>\n</div>\n</div>\n</div>\n\n<div class=\"fullscreen-btn-layer__2kn7\">&nbsp;</div>\n",
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