leetcode-problemset/leetcode-cn/originData/subarray-sum-equals-k.json

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        "question": {
            "questionId": "560",
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            "categoryTitle": "Algorithms",
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            "title": "Subarray Sum Equals K",
            "titleSlug": "subarray-sum-equals-k",
            "content": "<p>Given an array of integers <code>nums</code> and an integer <code>k</code>, return <em>the total number of subarrays whose sum equals to</em> <code>k</code>.</p>\n\n<p>A subarray is a contiguous <strong>non-empty</strong> sequence of elements within an array.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n<pre><strong>Input:</strong> nums = [1,1,1], k = 2\n<strong>Output:</strong> 2\n</pre><p><strong class=\"example\">Example 2:</strong></p>\n<pre><strong>Input:</strong> nums = [1,2,3], k = 3\n<strong>Output:</strong> 2\n</pre>\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>-1000 &lt;= nums[i] &lt;= 1000</code></li>\n\t<li><code>-10<sup>7</sup> &lt;= k &lt;= 10<sup>7</sup></code></li>\n</ul>\n",
            "translatedTitle": "和为 K 的子数组",
            "translatedContent": "<p>给你一个整数数组 <code>nums</code> 和一个整数&nbsp;<code>k</code> ，请你统计并返回 <em>该数组中和为&nbsp;<code>k</code><strong>&nbsp;</strong>的子数组的个数&nbsp;</em>。</p>\n\n<p>子数组是数组中元素的连续非空序列。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,1,1], k = 2\n<strong>输出：</strong>2\n</pre>\n\n<p><strong>示例 2：</strong></p>\n\n<pre>\n<strong>输入：</strong>nums = [1,2,3], k = 3\n<strong>输出：</strong>2\n</pre>\n\n<p>&nbsp;</p>\n\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>-1000 &lt;= nums[i] &lt;= 1000</code></li>\n\t<li><code>-10<sup>7</sup> &lt;= k &lt;= 10<sup>7</sup></code></li>\n</ul>\n",
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                    "code": "class Solution {\npublic:\n    int subarraySum(vector<int>& nums, int k) {\n\n    }\n};",
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                    "code": "class Solution(object):\n    def subarraySum(self, nums, k):\n        \"\"\"\n        :type nums: List[int]\n        :type k: int\n        :rtype: int\n        \"\"\"",
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                    "code": "/**\n * @param {number[]} nums\n * @param {number} k\n * @return {number}\n */\nvar subarraySum = function(nums, k) {\n\n};",
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                    "code": "class Solution {\n\n    /**\n     * @param Integer[] $nums\n     * @param Integer $k\n     * @return Integer\n     */\n    function subarraySum($nums, $k) {\n\n    }\n}",
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                    "code": "# @param {Integer[]} nums\n# @param {Integer} k\n# @return {Integer}\ndef subarray_sum(nums, k)\n\nend",
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                    "lang": "Erlang",
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                    "code": "defmodule Solution do\n  @spec subarray_sum(nums :: [integer], k :: integer) :: integer\n  def subarray_sum(nums, k) do\n    \n  end\nend",
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            "hints": [
                "Will Brute force work here? Try to optimize it.",
                "Can we optimize it by using some extra space?",
                "What about storing sum frequencies in a hash table? Will it be useful?",
                "sum(i,j)=sum(0,j)-sum(0,i), where sum(i,j) represents the sum of all the elements from index i to j-1.\r\n\r\nCan we use this property to optimize it."
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