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3sum.json
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"title": "3Sum",
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"content": "<p>Given an integer array nums, return all the triplets <code>[nums[i], nums[j], nums[k]]</code> such that <code>i != j</code>, <code>i != k</code>, and <code>j != k</code>, and <code>nums[i] + nums[j] + nums[k] == 0</code>.</p>\n\n<p>Notice that the solution set must not contain duplicate triplets.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<pre><strong>Input:</strong> nums = [-1,0,1,2,-1,-4]\n<strong>Output:</strong> [[-1,-1,2],[-1,0,1]]\n</pre><p><strong>Example 2:</strong></p>\n<pre><strong>Input:</strong> nums = []\n<strong>Output:</strong> []\n</pre><p><strong>Example 3:</strong></p>\n<pre><strong>Input:</strong> nums = [0]\n<strong>Output:</strong> []\n</pre>\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 <= nums.length <= 3000</code></li>\n\t<li><code>-10<sup>5</sup> <= nums[i] <= 10<sup>5</sup></code></li>\n</ul>\n",
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"code": "class Solution {\npublic:\n vector<vector<int>> threeSum(vector<int>& nums) {\n \n }\n};",
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"code": "class Solution(object):\n def threeSum(self, nums):\n \"\"\"\n :type nums: List[int]\n :rtype: List[List[int]]\n \"\"\"\n ",
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"code": "/**\n * @param {number[]} nums\n * @return {number[][]}\n */\nvar threeSum = function(nums) {\n \n};",
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"code": "impl Solution {\n pub fn three_sum(nums: Vec<i32>) -> Vec<Vec<i32>> {\n \n }\n}",
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"code": "(define/contract (three-sum nums)\n (-> (listof exact-integer?) (listof (listof exact-integer?)))\n\n )",
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"hints": [
"So, we essentially need to find three numbers x, y, and z such that they add up to the given value. If we fix one of the numbers say x, we are left with the two-sum problem at hand!",
"For the two-sum problem, if we fix one of the numbers, say <pre>x</pre>, we have to scan the entire array to find the next number<pre>y</pre> which is <pre>value - x</pre> where value is the input parameter. Can we change our array somehow so that this search becomes faster?",
"The second train of thought for two-sum is, without changing the array, can we use additional space somehow? Like maybe a hash map to speed up the search?"
],
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Java 8 features such as lambda expressions and stream API can be used. </p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n<p>Includes <code>Pair</code> class from https://docs.oracle.com/javase/8/javafx/api/javafx/util/Pair.html.</p>\"], \"python\": [\"Python\", \"<p><code>Python 2.7.12</code>.</p>\\r\\n\\r\\n<p>Most libraries are already imported automatically for your convenience, such as <a href=\\\"https://docs.python.org/2/library/array.html\\\" target=\\\"_blank\\\">array</a>, <a href=\\\"https://docs.python.org/2/library/bisect.html\\\" target=\\\"_blank\\\">bisect</a>, <a href=\\\"https://docs.python.org/2/library/collections.html\\\" target=\\\"_blank\\\">collections</a>. 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