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"title": "Count Good Triplets",
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"content": "<p>Given an array of integers <code>arr</code>, and three integers <code>a</code>, <code>b</code> and <code>c</code>. You need to find the number of good triplets.</p>\r\n\r\n<p>A triplet <code>(arr[i], arr[j], arr[k])</code> is <strong>good</strong> if the following conditions are true:</p>\r\n\r\n<ul>\r\n\t<li><code>0 <= i < j < k < arr.length</code></li>\r\n\t<li><code>|arr[i] - arr[j]| <= a</code></li>\r\n\t<li><code>|arr[j] - arr[k]| <= b</code></li>\r\n\t<li><code>|arr[i] - arr[k]| <= c</code></li>\r\n</ul>\r\n\r\n<p>Where <code>|x|</code> denotes the absolute value of <code>x</code>.</p>\r\n\r\n<p>Return<em> the number of good triplets</em>.</p>\r\n\r\n<p> </p>\r\n<p><strong>Example 1:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> arr = [3,0,1,1,9,7], a = 7, b = 2, c = 3\r\n<strong>Output:</strong> 4\r\n<strong>Explanation:</strong> There are 4 good triplets: [(3,0,1), (3,0,1), (3,1,1), (0,1,1)].\r\n</pre>\r\n\r\n<p><strong>Example 2:</strong></p>\r\n\r\n<pre>\r\n<strong>Input:</strong> arr = [1,1,2,2,3], a = 0, b = 0, c = 1\r\n<strong>Output:</strong> 0\r\n<strong>Explanation: </strong>No triplet satisfies all conditions.\r\n</pre>\r\n\r\n<p> </p>\r\n<p><strong>Constraints:</strong></p>\r\n\r\n<ul>\r\n\t<li><code>3 <= arr.length <= 100</code></li>\r\n\t<li><code>0 <= arr[i] <= 1000</code></li>\r\n\t<li><code>0 <= a, b, c <= 1000</code></li>\r\n</ul>",
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"code": "class Solution {\npublic:\n int countGoodTriplets(vector<int>& arr, int a, int b, int c) {\n \n }\n};",
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"code": "class Solution {\n public int countGoodTriplets(int[] arr, int a, int b, int c) {\n \n }\n}",
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"code": "class Solution(object):\n def countGoodTriplets(self, arr, a, b, c):\n \"\"\"\n :type arr: List[int]\n :type a: int\n :type b: int\n :type c: int\n :rtype: int\n \"\"\"\n ",
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"code": "class Solution:\n def countGoodTriplets(self, arr: List[int], a: int, b: int, c: int) -> int:\n ",
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"code": "public class Solution {\n public int CountGoodTriplets(int[] arr, int a, int b, int c) {\n \n }\n}",
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"code": "/**\n * @param {number[]} arr\n * @param {number} a\n * @param {number} b\n * @param {number} c\n * @return {number}\n */\nvar countGoodTriplets = function(arr, a, b, c) {\n \n};",
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"code": "# @param {Integer[]} arr\n# @param {Integer} a\n# @param {Integer} b\n# @param {Integer} c\n# @return {Integer}\ndef count_good_triplets(arr, a, b, c)\n \nend",
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"code": "class Solution {\n func countGoodTriplets(_ arr: [Int], _ a: Int, _ b: Int, _ c: Int) -> Int {\n \n }\n}",
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"lang": "Go",
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"code": "func countGoodTriplets(arr []int, a int, b int, c int) int {\n \n}",
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"code": "object Solution {\n def countGoodTriplets(arr: Array[Int], a: Int, b: Int, c: Int): Int = {\n \n }\n}",
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"code": "class Solution {\n fun countGoodTriplets(arr: IntArray, a: Int, b: Int, c: Int): Int {\n \n }\n}",
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"lang": "Rust",
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"code": "impl Solution {\n pub fn count_good_triplets(arr: Vec<i32>, a: i32, b: i32, c: i32) -> i32 {\n \n }\n}",
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"lang": "PHP",
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"code": "class Solution {\n\n /**\n * @param Integer[] $arr\n * @param Integer $a\n * @param Integer $b\n * @param Integer $c\n * @return Integer\n */\n function countGoodTriplets($arr, $a, $b, $c) {\n \n }\n}",
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"code": "function countGoodTriplets(arr: number[], a: number, b: number, c: number): number {\n\n};",
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"hints": [
"Notice that the constraints are small enough for a brute force solution to pass.",
"Loop through all triplets, and count the ones that are good."
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