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            "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>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>给定一个可能含有重复元素的整数数组，要求随机输出给定的数字的索引。 您可以假设给定的数字一定存在于数组中。</p>\n\n<p><strong>注意：</strong><br />\n数组大小可能非常大。 使用太多额外空间的解决方案将不会通过测试。</p>\n\n<p><strong>示例:</strong></p>\n\n<pre>\nint[] nums = new int[] {1,2,3,3,3};\nSolution solution = new Solution(nums);\n\n// pick(3) 应该返回索引 2,3 或者 4。每个索引的返回概率应该相等。\nsolution.pick(3);\n\n// pick(1) 应该返回 0。因为只有nums[0]等于1。\nsolution.pick(1);\n</pre>\n",
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                    "lang": "C++",
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                    "code": "class Solution {\npublic:\n    Solution(vector<int>& nums) {\n\n    }\n    \n    int pick(int target) {\n\n    }\n};\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution* obj = new Solution(nums);\n * int param_1 = obj->pick(target);\n */",
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                    "code": "class Solution {\n\n    public Solution(int[] nums) {\n\n    }\n    \n    public int pick(int target) {\n\n    }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution obj = new Solution(nums);\n * int param_1 = obj.pick(target);\n */",
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                    "code": "class Solution(object):\n\n    def __init__(self, nums):\n        \"\"\"\n        :type nums: List[int]\n        \"\"\"\n\n\n    def pick(self, target):\n        \"\"\"\n        :type target: int\n        :rtype: int\n        \"\"\"\n\n\n\n# Your Solution object will be instantiated and called as such:\n# obj = Solution(nums)\n# param_1 = obj.pick(target)",
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                    "code": "class Solution:\n\n    def __init__(self, nums: List[int]):\n\n\n    def pick(self, target: int) -> int:\n\n\n\n# Your Solution object will be instantiated and called as such:\n# obj = Solution(nums)\n# param_1 = obj.pick(target)",
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                    "code": "\n\n\ntypedef struct {\n\n} Solution;\n\n\nSolution* solutionCreate(int* nums, int numsSize) {\n\n}\n\nint solutionPick(Solution* obj, int target) {\n\n}\n\nvoid solutionFree(Solution* obj) {\n\n}\n\n/**\n * Your Solution struct will be instantiated and called as such:\n * Solution* obj = solutionCreate(nums, numsSize);\n * int param_1 = solutionPick(obj, target);\n \n * solutionFree(obj);\n*/",
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                    "code": "public class Solution {\n\n    public Solution(int[] nums) {\n\n    }\n    \n    public int Pick(int target) {\n\n    }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * Solution obj = new Solution(nums);\n * int param_1 = obj.Pick(target);\n */",
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                    "code": "/**\n * @param {number[]} nums\n */\nvar Solution = function(nums) {\n\n};\n\n/** \n * @param {number} target\n * @return {number}\n */\nSolution.prototype.pick = function(target) {\n\n};\n\n/**\n * Your Solution object will be instantiated and called as such:\n * var obj = new Solution(nums)\n * var param_1 = obj.pick(target)\n */",
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                    "code": "class Solution\n\n=begin\n    :type nums: Integer[]\n=end\n    def initialize(nums)\n\n    end\n\n\n=begin\n    :type target: Integer\n    :rtype: Integer\n=end\n    def pick(target)\n\n    end\n\n\nend\n\n# Your Solution object will be instantiated and called as such:\n# obj = Solution.new(nums)\n# param_1 = obj.pick(target)",
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                    "code": "type Solution struct {\n\n}\n\n\nfunc Constructor(nums []int) Solution {\n\n}\n\n\nfunc (this *Solution) Pick(target int) int {\n\n}\n\n\n/**\n * Your Solution object will be instantiated and called as such:\n * obj := Constructor(nums);\n * param_1 := obj.Pick(target);\n */",
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                    "code": "class Solution(_nums: Array[Int]) {\n\n    def pick(target: Int): Int = {\n\n    }\n\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * var obj = new Solution(nums)\n * var param_1 = obj.pick(target)\n */",
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                    "code": "class Solution(nums: IntArray) {\n\n    fun pick(target: Int): Int {\n\n    }\n\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * var obj = Solution(nums)\n * var param_1 = obj.pick(target)\n */",
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                    "code": "class Solution {\n    /**\n     * @param Integer[] $nums\n     */\n    function __construct($nums) {\n\n    }\n\n    /**\n     * @param Integer $target\n     * @return Integer\n     */\n    function pick($target) {\n\n    }\n}\n\n/**\n * Your Solution object will be instantiated and called as such:\n * $obj = Solution($nums);\n * $ret_1 = $obj->pick($target);\n */",
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