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            "title": "Number of Valid Move Combinations On Chessboard",
            "titleSlug": "number-of-valid-move-combinations-on-chessboard",
            "content": "<p>There is an <code>8 x 8</code> chessboard containing <code>n</code> pieces (rooks, queens, or bishops). You are given a string array <code>pieces</code> of length <code>n</code>, where <code>pieces[i]</code> describes the type (rook, queen, or bishop) of the <code>i<sup>th</sup></code> piece. In addition, you are given a 2D integer array <code>positions</code> also of length <code>n</code>, where <code>positions[i] = [r<sub>i</sub>, c<sub>i</sub>]</code> indicates that the <code>i<sup>th</sup></code> piece is currently at the <strong>1-based</strong> coordinate <code>(r<sub>i</sub>, c<sub>i</sub>)</code> on the chessboard.</p>\n\n<p>When making a <strong>move</strong> for a piece, you choose a <strong>destination</strong> square that the piece will travel toward and stop on.</p>\n\n<ul>\n\t<li>A rook can only travel <strong>horizontally or vertically</strong> from <code>(r, c)</code> to the direction of <code>(r+1, c)</code>, <code>(r-1, c)</code>, <code>(r, c+1)</code>, or <code>(r, c-1)</code>.</li>\n\t<li>A queen can only travel <strong>horizontally, vertically, or diagonally</strong> from <code>(r, c)</code> to the direction of <code>(r+1, c)</code>, <code>(r-1, c)</code>, <code>(r, c+1)</code>, <code>(r, c-1)</code>, <code>(r+1, c+1)</code>, <code>(r+1, c-1)</code>, <code>(r-1, c+1)</code>, <code>(r-1, c-1)</code>.</li>\n\t<li>A bishop can only travel <strong>diagonally</strong> from <code>(r, c)</code> to the direction of <code>(r+1, c+1)</code>, <code>(r+1, c-1)</code>, <code>(r-1, c+1)</code>, <code>(r-1, c-1)</code>.</li>\n</ul>\n\n<p>You must make a <strong>move</strong> for every piece on the board simultaneously. A <strong>move combination</strong> consists of all the <strong>moves</strong> performed on all the given pieces. Every second, each piece will instantaneously travel <strong>one square</strong> towards their destination if they are not already at it. All pieces start traveling at the <code>0<sup>th</sup></code> second. A move combination is <strong>invalid</strong> if, at a given time, <strong>two or more</strong> pieces occupy the same square.</p>\n\n<p>Return <em>the number of <strong>valid</strong> move combinations</em>​​​​​.</p>\n\n<p><strong>Notes:</strong></p>\n\n<ul>\n\t<li><strong>No two pieces</strong> will start in the<strong> same</strong> square.</li>\n\t<li>You may choose the square a piece is already on as its <strong>destination</strong>.</li>\n\t<li>If two pieces are <strong>directly adjacent</strong> to each other, it is valid for them to <strong>move past each other</strong> and swap positions in one second.</li>\n</ul>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/09/23/a1.png\" style=\"width: 215px; height: 215px;\" />\n<pre>\n<strong>Input:</strong> pieces = [&quot;rook&quot;], positions = [[1,1]]\n<strong>Output:</strong> 15\n<strong>Explanation:</strong> The image above shows the possible squares the piece can move to.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/09/23/a2.png\" style=\"width: 215px; height: 215px;\" />\n<pre>\n<strong>Input:</strong> pieces = [&quot;queen&quot;], positions = [[1,1]]\n<strong>Output:</strong> 22\n<strong>Explanation:</strong> The image above shows the possible squares the piece can move to.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2021/09/23/a3.png\" style=\"width: 214px; height: 215px;\" />\n<pre>\n<strong>Input:</strong> pieces = [&quot;bishop&quot;], positions = [[4,3]]\n<strong>Output:</strong> 12\n<strong>Explanation:</strong> The image above shows the possible squares the piece can move to.\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>n == pieces.length </code></li>\n\t<li><code>n == positions.length</code></li>\n\t<li><code>1 &lt;= n &lt;= 4</code></li>\n\t<li><code>pieces</code> only contains the strings <code>&quot;rook&quot;</code>, <code>&quot;queen&quot;</code>, and <code>&quot;bishop&quot;</code>.</li>\n\t<li>There will be at most one queen on the chessboard.</li>\n\t<li><code>1 &lt;= x<sub>i</sub>, y<sub>i</sub> &lt;= 8</code></li>\n\t<li>Each <code>positions[i]</code> is distinct.</li>\n</ul>\n",
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                    "code": "class Solution {\npublic:\n    int countCombinations(vector<string>& pieces, vector<vector<int>>& positions) {\n        \n    }\n};",
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                    "code": "class Solution(object):\n    def countCombinations(self, pieces, positions):\n        \"\"\"\n        :type pieces: List[str]\n        :type positions: List[List[int]]\n        :rtype: int\n        \"\"\"\n        ",
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                    "code": "/**\n * @param {string[]} pieces\n * @param {number[][]} positions\n * @return {number}\n */\nvar countCombinations = function(pieces, positions) {\n    \n};",
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                    "code": "# @param {String[]} pieces\n# @param {Integer[][]} positions\n# @return {Integer}\ndef count_combinations(pieces, positions)\n    \nend",
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                    "code": "class Solution {\n    func countCombinations(_ pieces: [String], _ positions: [[Int]]) -> Int {\n        \n    }\n}",
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                    "code": "func countCombinations(pieces []string, positions [][]int) int {\n    \n}",
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                    "code": "object Solution {\n    def countCombinations(pieces: Array[String], positions: Array[Array[Int]]): Int = {\n        \n    }\n}",
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                    "code": "class Solution {\n    fun countCombinations(pieces: Array<String>, positions: Array<IntArray>): Int {\n        \n    }\n}",
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                    "code": "impl Solution {\n    pub fn count_combinations(pieces: Vec<String>, positions: Vec<Vec<i32>>) -> i32 {\n        \n    }\n}",
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                    "code": "class Solution {\n\n    /**\n     * @param String[] $pieces\n     * @param Integer[][] $positions\n     * @return Integer\n     */\n    function countCombinations($pieces, $positions) {\n        \n    }\n}",
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                    "lang": "Erlang",
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                    "code": "-spec count_combinations(Pieces :: [unicode:unicode_binary()], Positions :: [[integer()]]) -> integer().\ncount_combinations(Pieces, Positions) ->\n  .",
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                    "code": "defmodule Solution do\n  @spec count_combinations(pieces :: [String.t], positions :: [[integer]]) :: integer\n  def count_combinations(pieces, positions) do\n\n  end\nend",
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            "hints": [
                "N is small, we can generate all possible move combinations.",
                "For each possible move combination, determine which ones are valid."
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