Leetcode Problem 128. Longest Consecutive Sequence

128. Longest Consecutive Sequence

Leetcode Solutions

Create a HashSet and add all the numbers from the input array to it.
Initialize a variable to keep track of the length of the longest sequence found so far.
Iterate through each number in the input array.
For each number, check if the HashSet contains the number immediately preceding it. If it does, continue to the next number.
If the number is the start of a sequence, incrementally check for the next numbers in the sequence and count the sequence length.
Update the longest sequence length if the current sequence is longer.
Return the length of the longest sequence after checking all numbers.

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