longest consecutive elementsYou need to write a function that takes an unsorted array of integers as input and returns the length of the longest consecutive elements sequence in the array. A consecutive elements sequence is a subarray where the elements are adjacent in value, such as [1, 2, 3, 4] or [5, 6, 7, 8]. The order of the elements in the input array does not matter.For example, given the input array [100, 4, 200, 1, 3, 2], the longest consecutive elements sequence is [1, 2, 3, 4], which has a length of 4. Therefore, your function should return 4.In this case, there are no consecutive elements in the array, so the length of the longest consecutive element sequence is 1.Testcase:Input11 // no of elements of array8 10 12 14 1 2 3 4 5 6 7 // array elementsOutput:8
Question
longest consecutive elementsYou need to write a function that takes an unsorted array of integers as input and returns the length of the longest consecutive elements sequence in the array. A consecutive elements sequence is a subarray where the elements are adjacent in value, such as [1, 2, 3, 4] or [5, 6, 7, 8]. The order of the elements in the input array does not matter.For example, given the input array [100, 4, 200, 1, 3, 2], the longest consecutive elements sequence is [1, 2, 3, 4], which has a length of 4. Therefore, your function should return 4.In this case, there are no consecutive elements in the array, so the length of the longest consecutive element sequence is 1.Testcase:Input11 // no of elements of array8 10 12 14 1 2 3 4 5 6 7 // array elementsOutput:8
Solution
Sure, here is a Python solution for the problem:
def longest_consecutive(nums):
if not nums:
return 0
nums = set(nums)
longest_streak = 0
for num in nums:
if num - 1 not in nums:
current_num = num
current_streak = 1
while current_num + 1 in nums:
current_num += 1
current_streak += 1
longest_streak = max(longest_streak, current_streak)
return longest_streak
This function works by first converting the input list into a set. This allows us to efficiently check for the presence of an element in O(1) time.
The function then iterates over each number in the set. If the number is the start of a sequence (i.e., num - 1 is not in the set), then it checks for the presence of the rest of the sequence in the set, and keeps track of the length of the longest sequence found.
Finally, it returns the length of the longest sequence.
For example, if you call longest_consecutive([8, 10, 12, 14, 1, 2, 3, 4, 5, 6, 7]), it will return 8, which is the length of the longest consecutive sequence [1, 2, 3, 4, 5, 6, 7, 8].
Similar Questions
Given an array, find the length of the longest subsequence whose elements can be re-arranged in a strictly increasing contiguous order. The difference between 2 adjacent elements in the subsequence, after re-arrangement, should be exactly 1.Input FormatThe first line of input contains T - the number of test cases. It's followed by 2T lines. The first line of each test case contains N - size of the array. The next line contains N integers - the elements of the array.Output FormatFor each test case, print the length of the longest subsequence, separated by a new line.Constraints1 <= T <= 10001 <= N <= 10000-100000 <= ar[i] <= 100000ExampleInput3821 -22 -22 5 -31 -24 5 -231018 -33 31 33 30 -14 32 30 16 1766 3 8 5 2 5Output342ExplanationTest Case 1Subsequence is: -22, -24, -23.Test Case 2Subsequence is: 31, 33, 30, 32.Test Case 3Subsequence is: 6, 5 or 3, 2.
You are given an array of size N containing unique integers. Find the size of the largest subarray that can be rearranged to form a contiguous sequence.A contiguous sequence means that the difference of adjacent elements should be 1.Input FormatThe first line of input contains T - the number of test cases. It's followed by 2T lines, the first line contains N - the size of the array. The second line contains the elements of the array.Output FormatFor each test case, print the size of the largest subarray that can be rearranged to form a contiguous sequence, on a new line.Constraints30 points1 <= T <= 1004 <= N <= 10070 points1 <= T <= 1004 <= N <= 1000General Constraints0 <= A[i] <= 105ExampleInput251 3 2 6 590 8 6 5 7 10 3 2 1Output34ExplanationTest-Case 1The largest subarray that can be rearranged to form a contiguous sequence is [1, 3, 2] which can be rearranged to form [1, 2, 3].Test-Case 2The largest subarray that can be rearranged to form a contiguous sequence is [8, 6, 5, 7] which can be rearranged to form [5, 6, 7, 8].
length of the longest subarrayGiven an array of elements, return the length of the longest subarray where all its elements are distinct.For example,given the array `[5, 1, 3, 5, 2, 3, 4, 1]`, return `5` as the longest subarray of distinct elements is `[5, 2, 3, 4, 1]`.Sample Test CasesTest Case 1:Expected Output:Enter·elements·of·the·list·separated·by·,(comma):·5,1,3,5,2,3,4,1Unique·no.of·elements·are:·5Test Case 2:Expected Output:Enter·elements·of·the·list·separated·by·,(comma):·5,5,5Unique·no.of·elements·are:·1
You are given an integer array nums.A subsequence sub of nums with length x is called valid if it satisfies:(sub[0] + sub[1]) % 2 == (sub[1] + sub[2]) % 2 == ... == (sub[x - 2] + sub[x - 1]) % 2.Return the length of the longest valid subsequence of nums.A subsequence is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements. Example 1:Input: nums = [1,2,3,4]Output: 4Explanation:The longest valid subsequence is [1, 2, 3, 4].Example 2:Input: nums = [1,2,1,1,2,1,2]Output: 6Explanation:The longest valid subsequence is [1, 2, 1, 2, 1, 2].Example 3:Input: nums = [1,3]Output: 2Explanation:The longest valid subsequence is [1, 3]. Constraints:2 <= nums.length <= 2 * 1051 <= nums[i] <= 107
Given an array of integers, find the longest subarray where the absolute difference between any two elements is less than or equal to .
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