# Longest Consecutive Sequence

Given an unsorted array of integers `nums`

, find the length of the longest sequence of consecutive elements.

**Constraints**

`n ≤ 100,000`

where`n`

is the length of`nums`

https://binarysearch.com/problems/Longest-Consecutive-Sequence

## Examples

### Example 1

**Input**

- nums =
`[100, 4, 200, 1, 3, 2, 101, 105, 103, 102, 104]`

**Output**

- answer =
`6`

**Explanation**

The longest sequence of consecutive elements is `[100, 101, 102, 103, 104, 105]`

. so we return its length: `6`

.

### Example 2

**Input**

- nums =
`[100, 4, 200, 1, 3, 2]`

**Output**

- answer =
`4`

**Explanation**

The longest sequence of consecutive elements is `[1, 2, 3, 4]`

. so we return its length: `4`

.

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