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            "title": "Number of Pairs of Interchangeable Rectangles",
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            "content": "<p>You are given <code>n</code> rectangles represented by a <strong>0-indexed</strong> 2D integer array <code>rectangles</code>, where <code>rectangles[i] = [width<sub>i</sub>, height<sub>i</sub>]</code> denotes the width and height of the <code>i<sup>th</sup></code> rectangle.</p>\n\n<p>Two rectangles <code>i</code> and <code>j</code> (<code>i &lt; j</code>) are considered <strong>interchangeable</strong> if they have the <strong>same</strong> width-to-height ratio. More formally, two rectangles are <strong>interchangeable</strong> if <code>width<sub>i</sub>/height<sub>i</sub> == width<sub>j</sub>/height<sub>j</sub></code> (using decimal division, not integer division).</p>\n\n<p>Return <em>the <strong>number</strong> of pairs of <strong>interchangeable</strong> rectangles in </em><code>rectangles</code>.</p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> rectangles = [[4,8],[3,6],[10,20],[15,30]]\n<strong>Output:</strong> 6\n<strong>Explanation:</strong> The following are the interchangeable pairs of rectangles by index (0-indexed):\n- Rectangle 0 with rectangle 1: 4/8 == 3/6.\n- Rectangle 0 with rectangle 2: 4/8 == 10/20.\n- Rectangle 0 with rectangle 3: 4/8 == 15/30.\n- Rectangle 1 with rectangle 2: 3/6 == 10/20.\n- Rectangle 1 with rectangle 3: 3/6 == 15/30.\n- Rectangle 2 with rectangle 3: 10/20 == 15/30.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> rectangles = [[4,5],[7,8]]\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> There are no interchangeable pairs of rectangles.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == rectangles.length</code></li>\n\t<li><code>1 &lt;= n &lt;= 10<sup>5</sup></code></li>\n\t<li><code>rectangles[i].length == 2</code></li>\n\t<li><code>1 &lt;= width<sub>i</sub>, height<sub>i</sub> &lt;= 10<sup>5</sup></code></li>\n</ul>\n",
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                    "lang": "C++",
                    "langSlug": "cpp",
                    "code": "class Solution {\npublic:\n    long long interchangeableRectangles(vector<vector<int>>& rectangles) {\n        \n    }\n};",
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                    "code": "class Solution {\n    public long interchangeableRectangles(int[][] rectangles) {\n        \n    }\n}",
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                    "code": "class Solution(object):\n    def interchangeableRectangles(self, rectangles):\n        \"\"\"\n        :type rectangles: List[List[int]]\n        :rtype: int\n        \"\"\"\n        ",
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                    "code": "class Solution:\n    def interchangeableRectangles(self, rectangles: List[List[int]]) -> int:\n        ",
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                    "lang": "C",
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                    "code": "\n\nlong long interchangeableRectangles(int** rectangles, int rectanglesSize, int* rectanglesColSize){\n\n}",
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                    "code": "public class Solution {\n    public long InterchangeableRectangles(int[][] rectangles) {\n        \n    }\n}",
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                    "lang": "JavaScript",
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                    "code": "/**\n * @param {number[][]} rectangles\n * @return {number}\n */\nvar interchangeableRectangles = function(rectangles) {\n    \n};",
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                    "code": "# @param {Integer[][]} rectangles\n# @return {Integer}\ndef interchangeable_rectangles(rectangles)\n    \nend",
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                    "code": "class Solution {\n    func interchangeableRectangles(_ rectangles: [[Int]]) -> Int {\n        \n    }\n}",
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                    "code": "func interchangeableRectangles(rectangles [][]int) int64 {\n    \n}",
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                    "code": "object Solution {\n    def interchangeableRectangles(rectangles: Array[Array[Int]]): Long = {\n        \n    }\n}",
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                    "code": "class Solution {\n    fun interchangeableRectangles(rectangles: Array<IntArray>): Long {\n        \n    }\n}",
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                    "code": "impl Solution {\n    pub fn interchangeable_rectangles(rectangles: Vec<Vec<i32>>) -> i64 {\n        \n    }\n}",
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                    "code": "class Solution {\n\n    /**\n     * @param Integer[][] $rectangles\n     * @return Integer\n     */\n    function interchangeableRectangles($rectangles) {\n        \n    }\n}",
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                    "lang": "Erlang",
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                    "lang": "Elixir",
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                    "code": "defmodule Solution do\n  @spec interchangeable_rectangles(rectangles :: [[integer]]) :: integer\n  def interchangeable_rectangles(rectangles) do\n\n  end\nend",
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            "hints": [
                "Store the rectangle height and width ratio in a hashmap.",
                "Traverse the ratios, and for each ratio, use the frequency of the ratio to add to the total pair count."
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