"content":"<p>You are given two integers <code>m</code> and <code>n</code> representing the dimensions of a <strong>0-indexed</strong> <code>m x n</code> grid.</p>\n\n<p>You are also given a <strong>0-indexed</strong> 2D integer matrix <code>coordinates</code>, where <code>coordinates[i] = [x, y]</code> indicates that the cell with coordinates <code>[x, y]</code> is colored <strong>black</strong>. All cells in the grid that do not appear in <code>coordinates</code> are <strong>white</strong>.</p>\n\n<p>A block is defined as a <code>2 x 2</code> submatrix of the grid. More formally, a block with cell <code>[x, y]</code> as its top-left corner where <code>0 <= x < m - 1</code> and <code>0 <= y < n - 1</code> contains the coordinates <code>[x, y]</code>, <code>[x + 1, y]</code>, <code>[x, y + 1]</code>, and <code>[x + 1, y + 1]</code>.</p>\n\n<p>Return <em>a <strong>0-indexed</strong> integer array</em> <code>arr</code> <em>of size</em> <code>5</code> <em>such that</em> <code>arr[i]</code> <em>is the number of blocks that contains exactly</em> <code>i</code> <em><strong>black</strong> cells</em>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> m = 3, n = 3, coordinates = [[0,0]]\n<strong>Output:</strong> [3,1,0,0,0]\n<strong>Explanation:</strong> The grid looks like this:\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2023/06/18/screen-shot-2023-06-18-at-44656-am.png\" style=\"width: 150px; height: 128px;\" />\nThere is only 1 block with one black cell, and it is the block starting with cell [0,0].\nThe other 3 blocks start with cells [0,1], [1,0] and [1,1]. They all have zero black cells. \nThus, we return [3,1,0,0,0]. \n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> m = 3, n = 3, coordinates = [[0,0],[1,1],[0,2]]\n<strong>Output:</strong> [0,2,2,0,0]\n<strong>Explanation:</strong> The grid looks like this:\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2023/06/18/screen-shot-2023-06-18-at-45018-am.png\" style=\"width: 150px; height: 128px;\" />\nThere are 2 blocks with two black cells (the ones starting with cell coordinates [0,0] and [0,1]).\nThe other 2 blocks have starting cell coordinates of [1,0] and [1,1]. They both have 1 black cell.\nTherefore, we return [0,2,2,0,0].\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>2 <= m <= 10<sup>5</sup></code></li>\n\t<li><code>2 <= n <= 10<sup>5</sup></code></li>\n\t<li><code>0 <= coordinates.length <= 10<sup>4</sup></code></li>\n\t<li><code>coordinates[i].length == 2</code></li>\n\t<li><code>0 <= coordinates[i][0] < m</code></li>\n\t<li><code>0 <= coordinates[i][1] < n</code></li>\n\t<li>It is guaranteed that <code>coordinates</code> contains pairwise distinct coordinates.</li>\n</ul>\n",
"code":"/**\n * Note: The returned array must be malloced, assume caller calls free().\n */\nlong long* countBlackBlocks(int m, int n, int** coordinates, int coordinatesSize, int* coordinatesColSize, int* returnSize){\n\n}",
"__typename":"CodeSnippetNode"
},
{
"lang":"C#",
"langSlug":"csharp",
"code":"public class Solution {\n public long[] CountBlackBlocks(int m, int n, int[][] coordinates) {\n \n }\n}",
"The number of blocks is too much but the number of black cells is less than that.",
"It means the number of blocks with at least one black cell is O(|coordinates|). let’s just hold them.",
"Iterate through the coordinates and update the block counts accordingly. For each coordinate, determine which block(s) it belongs to and increment the count of black cells for those block(s).",
"After processing all the coordinates, count the number of blocks with different numbers of black cells. You can use another data structure to keep track of the counts of blocks with 0 black cells, 1 black cell, and so on."
"envInfo":"{\"cpp\": [\"C++\", \"<p>Compiled with <code> clang 11 </code> using the latest C++ 20 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level two optimization (<code>-O2</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\"], \"java\": [\"Java\", \"<p><code>OpenJDK 17</code>. 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>. If you need more libraries, you can import it yourself.</p>\\r\\n\\r\\n<p>For Map/TreeMap data structure, you may use <a href=\\\"http://www.grantjenks.com/docs/sortedcontainers/\\\" target=\\\"_blank\\\">sortedcontainers</a> library.</p>\\r\\n\\r\\n<p>Note that Python 2.7 <a href=\\\"https://www.python.org/dev/peps/pep-0373/\\\" target=\\\"_blank\\\">will not be maintained past 2020</a>. For the latest Python, please choose Python3 instead.</p>\"], \"c\": [\"C\", \"<p>Compiled with <code>gcc 8.2</code> using the gnu11 standard.</p>\\r\\n\\r\\n<p>Your code is compiled with level one optimization (<code>-O1</code>). <a href=\\\"https://github.com/google/sanitizers/wiki/AddressSanitizer\\\" target=\\\"_blank\\\">AddressSanitizer</a> is also enabled to help detect out-of-bounds and use-after-free bugs.</p>\\r\\n\\r\\n<p>Most standard library headers are already included automatically for your convenience.</p>\\r\\n\\r\\n<p>For hash table operations, you may use <a href=\\\"https://troydhanson.github.io/uthash/\\\" target=\\\"_blank\\\">uthash</a>. \\\"uthash.h\\\" is included by default. Below are some examples:</p>\\r\\n\\r\\n<p><b>1. Adding an item to a hash.</b>\\r\\n<pre>\\r\\nstruct hash_entry {\\r\\n int id; /* we'll use this field as the key */\\r\\n char name[10];\\r\\n UT_hash_handle hh; /* makes this structure hashable */\\r\\n};\\r\\n\\r\\nstruct hash_entry *users = NULL;\\r\\n\\r\\nvoid add_user(struct hash_entry *s) {\\r\\n HASH_ADD_INT(users, id, s);\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>2. Looking up an item in a hash:</b>\\r\\n<pre>\\r\\nstruct hash_entry *find_user(int user_id) {\\r\\n struct hash_entry *s;\\r\\n HASH_FIND_INT(users, &user_id, s);\\r\\n return s;\\r\\n}\\r\\n</pre>\\r\\n</p>\\r\\n\\r\\n<p><b>3. Deleting an item in a hash:</b>\\r\\n<pre>\\r\\nvoid delete_user(struct hash_entry *user) {\\r\\n HASH_DEL(users, user); \\r\\n}\\r\\n</pre>\\r\\n</p>\"], \"csharp\": [\"C#\", \"<p><a href=\\\"https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10\\\" target=\\\"_blank\\\">C# 10 with .NET 6 runtime</a></p>\"], \"javascript\": [\"JavaScript\", \"<p><code>Node.js 16.13.2</code>.</p>\\r\\n\\r\\n<p>Your code is run with <code>--harmony</code> flag, enabling <a href=\\\"http://node.green/\\\" target=\\\"_blank\\\">new ES6 features</a>.</p>\\r\\n\\r\\n<p><a href=\\\"https://lodash.com\\\" target=\\\"_blank\\\">lodash.js</a> library is included by default.</p>\\r\\n\\r\\n<p>For Priority Queue / Queue data structures, you may use 5.3.0 version of <a href=\\\"https://github.com/datastructures-js/priority-queue/tree/fb4fdb984834421279aeb081df7af624d17c2a03\\\" target=\\\"_blank\\\">datastructures-js/priority-queue</a> and 4.2.1 version of <a href=\\\"https://githu
