Breaking News: Grepper is joining You.com. Read the official announcement!

Longest Consecutive Sequence

kouqhar answered on April 22, 2024 Popularity 3/10 Helpfulness 1/10

answer Longest Consecutive Sequence

related longest consecutive sequence in array

Longest Consecutive Sequence

Comment

/*
  Given an array of integers nums, return the length of the longest consecutive
  sequence of elements.

  A consecutive sequence is a sequence of elements in which each element is 
  exactly 1 greater than the previous element.

  You must write an algorithm that runs in O(n) time.
  Example 1:
  Input: nums = [2,20,4,10,3,4,5]
  Output: 4
  Explanation: The longest consecutive sequence is [2, 3, 4, 5].

  Example 2:
  Input: nums = [0,3,2,5,4,6,1,1]
  Output: 7
*/

  const longestConsecutive = nums => {
    let [result, sortedNums, counter, finalLength] = [
      [],
      nums.sort((a, b) => a - b),
      0,
      0,
    ];

    for (let i = 0; i < sortedNums.length; i++) {
      if (i === 0) result.push(sortedNums[i]);
      else {
        const subtract = sortedNums[i] - sortedNums[i - 1];

        if (subtract === 1) result.push(sortedNums[i]);
        else if (subtract === 0) continue;
        else {
          counter++;
          if (counter > 0) {
            result = [sortedNums[0]];
            counter = 0;
          }
        }
      }

      result.length > finalLength ? (finalLength = result.length) : null;
    }

    return finalLength;
  }
  
  const nums = [9,1,-3,2,4,8,3,-1,6,-2,-4,7]
  longestConsecutive(nums) // 4


// With love @kouqhar

Popularity 3/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript sequence

Link to this answer
Share Copy Link

Contributed on Oct 18 2024

kouqhar

0 Answers Avg Quality 2/10

Closely Related Answers

longest consecutive sequence in array

Comment

def longestSuccessiveElements(a):
    n = len(a)
    if n == 0:
        return 0

    # sort the array
    a.sort()
    lastSmaller = float('-inf')
    cnt = 0
    longest = 1

    # find longest sequence
    for i in range(n):
        if a[i] - 1 == lastSmaller:
            # a[i] is the next element of the
            # current sequence
            cnt += 1
            lastSmaller = a[i]
        elif a[i] != lastSmaller:
            cnt = 1
            lastSmaller = a[i]
        longest = max(longest, cnt)
    return longest

a = [100, 200, 1, 2, 3, 4]
ans = longestSuccessiveElements(a)
print("The longest consecutive sequence is", ans)

Popularity 8/10 Helpfulness 1/10 Language whatever

Source: takeuforward.org

Tags: sequence whatever whateve

Link to this answer
Share Copy Link

Contributed on Apr 22 2024

Vikash Kumar

0 Answers Avg Quality 2/10

Longest Consecutive Sequence

Contents

More Related Answers

Longest Consecutive Sequence

Closely Related Answers

longest consecutive sequence in array

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.