leetcode-problemset/leetcode/originData/flatten-deeply-nested-array.json

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            "title": "Flatten Deeply Nested Array",
            "titleSlug": "flatten-deeply-nested-array",
            "content": "<p>Given a&nbsp;<strong>multi-dimensional</strong> array&nbsp;<code>arr</code>&nbsp;and a depth <code>n</code>, return&nbsp;a&nbsp;<strong>flattened</strong>&nbsp;version of that array.</p>\n\n<p>A <strong>multi-dimensional</strong>&nbsp;array is a recursive data structure that contains integers or other&nbsp;<strong>multi-dimensional</strong>&nbsp;arrays.</p>\n\n<p>A&nbsp;<strong>flattened</strong>&nbsp;array is a version of that array with some or all of the sub-arrays removed and replaced with the actual elements in that sub-array. This flattening operation should only be done if the current depth of nesting&nbsp;is less&nbsp;than&nbsp;<code>n</code>. The depth of the elements in the first array are considered to be&nbsp;<code>0</code>.</p>\n\n<p>Please solve it without the built-in&nbsp;<code>Array.flat</code> method.</p>\n\n<p>&nbsp;</p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input</strong>\narr = [1, 2, 3, [4, 5, 6], [7, 8, [9, 10, 11], 12], [13, 14, 15]]\nn = 0\n<strong>Output</strong>\n[1, 2, 3, [4, 5, 6], [7, 8, [9, 10, 11], 12], [13, 14, 15]]\n\n<strong>Explanation</strong>\nPassing a depth of n=0 will always result in the original array. This is because the smallest possible depth of a subarray (0) is not less than n=0. Thus, no subarray should be flattened. </pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input</strong>\narr = [1, 2, 3, [4, 5, 6], [7, 8, [9, 10, 11], 12], [13, 14, 15]]\nn = 1\n<strong>Output</strong>\n[1, 2, 3, 4, 5, 6, 7, 8, [9, 10, 11], 12, 13, 14, 15]\n\n<strong>Explanation</strong>\nThe subarrays starting with 4, 7, and 13 are all flattened. This is because their depth of 0 is less than 1. However [9, 10, 11] remains unflattened because its depth is 1.</pre>\n\n<p><strong class=\"example\">Example 3:</strong></p>\n\n<pre>\n<strong>Input</strong>\narr = [[1, 2, 3], [4, 5, 6], [7, 8, [9, 10, 11], 12], [13, 14, 15]]\nn = 2\n<strong>Output</strong>\n[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]\n\n<strong>Explanation</strong>\nThe maximum depth of any subarray is 1. Thus, all of them are flattened.</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 &lt;= count of numbers in arr &lt;=&nbsp;10<sup>5</sup></code></li>\n\t<li><code>0 &lt;= count of subarrays in arr &lt;=&nbsp;10<sup>5</sup></code></li>\n\t<li><code>maxDepth &lt;= 1000</code></li>\n\t<li><code>-1000 &lt;= each number &lt;= 1000</code></li>\n\t<li><code><font face=\"monospace\">0 &lt;= n &lt;= 1000</font></code></li>\n</ul>\n",
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                    "code": "/**\n * @param {Array} arr\n * @param {number} depth\n * @return {Array}\n */\nvar flat = function (arr, n) {\n    \n};",
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                    "code": "type MultiDimensionalArray = (number | MultiDimensionalArray)[];\n\nvar flat = function (arr:  MultiDimensionalArray, n: number):  MultiDimensionalArray {\n    \n};",
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                "Write a recursive function that keeps track of the current depth.",
                "if the current depth >= the maximum depth, always just push the value to the returned array. Otherwise recursively call flat on the array."
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