mirror of
https://gitee.com/coder-xiaomo/leetcode-problemset
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164 lines
17 KiB
JSON
164 lines
17 KiB
JSON
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"questionId": "27",
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"title": "Remove Element",
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"content": "<p>Given an integer array <code>nums</code> and an integer <code>val</code>, remove all occurrences of <code>val</code> in <code>nums</code> <a href=\"https://en.wikipedia.org/wiki/In-place_algorithm\" target=\"_blank\"><strong>in-place</strong></a>. The order of the elements may be changed. Then return <em>the number of elements in </em><code>nums</code><em> which are not equal to </em><code>val</code>.</p>\n\n<p>Consider the number of elements in <code>nums</code> which are not equal to <code>val</code> be <code>k</code>, to get accepted, you need to do the following things:</p>\n\n<ul>\n\t<li>Change the array <code>nums</code> such that the first <code>k</code> elements of <code>nums</code> contain the elements which are not equal to <code>val</code>. The remaining elements of <code>nums</code> are not important as well as the size of <code>nums</code>.</li>\n\t<li>Return <code>k</code>.</li>\n</ul>\n\n<p><strong>Custom Judge:</strong></p>\n\n<p>The judge will test your solution with the following code:</p>\n\n<pre>\nint[] nums = [...]; // Input array\nint val = ...; // Value to remove\nint[] expectedNums = [...]; // The expected answer with correct length.\n // It is sorted with no values equaling val.\n\nint k = removeElement(nums, val); // Calls your implementation\n\nassert k == expectedNums.length;\nsort(nums, 0, k); // Sort the first k elements of nums\nfor (int i = 0; i < actualLength; i++) {\n assert nums[i] == expectedNums[i];\n}\n</pre>\n\n<p>If all assertions pass, then your solution will be <strong>accepted</strong>.</p>\n\n<p> </p>\n<p><strong class=\"example\">Example 1:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [3,2,2,3], val = 3\n<strong>Output:</strong> 2, nums = [2,2,_,_]\n<strong>Explanation:</strong> Your function should return k = 2, with the first two elements of nums being 2.\nIt does not matter what you leave beyond the returned k (hence they are underscores).\n</pre>\n\n<p><strong class=\"example\">Example 2:</strong></p>\n\n<pre>\n<strong>Input:</strong> nums = [0,1,2,2,3,0,4,2], val = 2\n<strong>Output:</strong> 5, nums = [0,1,4,0,3,_,_,_]\n<strong>Explanation:</strong> Your function should return k = 5, with the first five elements of nums containing 0, 0, 1, 3, and 4.\nNote that the five elements can be returned in any order.\nIt does not matter what you leave beyond the returned k (hence they are underscores).\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>0 <= nums.length <= 100</code></li>\n\t<li><code>0 <= nums[i] <= 50</code></li>\n\t<li><code>0 <= val <= 100</code></li>\n</ul>\n",
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"difficulty": "Easy",
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"exampleTestcases": "[3,2,2,3]\n3\n[0,1,2,2,3,0,4,2]\n2",
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"categoryTitle": "Algorithms",
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"name": "Array",
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"name": "Two Pointers",
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"code": "class Solution {\npublic:\n int removeElement(vector<int>& nums, int val) {\n \n }\n};",
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"code": "class Solution(object):\n def removeElement(self, nums, val):\n \"\"\"\n :type nums: List[int]\n :type val: int\n :rtype: int\n \"\"\"\n ",
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"code": "/**\n * @param {number[]} nums\n * @param {number} val\n * @return {number}\n */\nvar removeElement = function(nums, val) {\n \n};",
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"code": "class Solution {\n\n /**\n * @param Integer[] $nums\n * @param Integer $val\n * @return Integer\n */\n function removeElement(&$nums, $val) {\n \n }\n}",
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"code": "class Solution {\n func removeElement(_ nums: inout [Int], _ val: Int) -> Int {\n \n }\n}",
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"lang": "Kotlin",
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"code": "class Solution {\n fun removeElement(nums: IntArray, `val`: Int): Int {\n \n }\n}",
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"code": "class Solution {\n int removeElement(List<int> nums, int val) {\n \n }\n}",
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"code": "func removeElement(nums []int, val int) int {\n \n}",
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"lang": "Ruby",
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"langSlug": "ruby",
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"code": "# @param {Integer[]} nums\n# @param {Integer} val\n# @return {Integer}\ndef remove_element(nums, val)\n \nend",
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"lang": "Scala",
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"langSlug": "scala",
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"code": "object Solution {\n def removeElement(nums: Array[Int], `val`: Int): Int = {\n \n }\n}",
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{
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"lang": "Rust",
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"langSlug": "rust",
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"code": "impl Solution {\n pub fn remove_element(nums: &mut Vec<i32>, val: i32) -> i32 {\n \n }\n}",
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"stats": "{\"totalAccepted\": \"2.4M\", \"totalSubmission\": \"4.3M\", \"totalAcceptedRaw\": 2368579, \"totalSubmissionRaw\": 4286369, \"acRate\": \"55.3%\"}",
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"hints": [
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"The problem statement clearly asks us to modify the array in-place and it also says that the element beyond the new length of the array can be anything. Given an element, we need to remove all the occurrences of it from the array. We don't technically need to <b>remove</b> that element per-say, right?",
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"We can move all the occurrences of this element to the end of the array. Use two pointers!\r\n<br><img src=\"https://assets.leetcode.com/uploads/2019/10/20/hint_remove_element.png\" width=\"500\"/>",
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"Yet another direction of thought is to consider the elements to be removed as non-existent. In a single pass, if we keep copying the visible elements in-place, that should also solve this problem for us."
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"sampleTestCase": "[3,2,2,3]\n3",
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