# Accepted C#, O(N) time & O(N) space, Undirected Cyclic Graph Solution

• Hi All,

In my approach I created an undirected cyclic Graph where the connected components represent consecutive sequences.

I welcome constructive criticism.

```public class Solution
{
public int LongestConsecutive(int[] num)
{

var d = new Dictionary<int, Bucket>();

for (var i = 0; i < num.Length; ++i)
{
Bucket p;
Bucket n;
Bucket c;

d.TryGetValue(num[i] - 1, out p);
d.TryGetValue(num[i] + 1, out n);

if (!d.TryGetValue(num[i], out c))
{
c = new Bucket();
}

if (n != null)
{
}

if (p != null)
{
}
}

var visited = new Dictionary<Bucket, bool>();
var maxSequenceCount = 0;
var q = new Queue<Bucket>();

foreach (var bucket in d.Values)
{
q.Enqueue(bucket);

var setSize = 0;

while (q.Count > 0)
{
var b = q.Peek();
q.Dequeue();
bool beenThere = false;

if (visited.TryGetValue(b, out beenThere) && beenThere)
continue;

visited[b] = true;

foreach (var n in b.Neighbours)
{
beenThere = false;

if (visited.TryGetValue(n, out beenThere) && beenThere)
continue;

q.Enqueue(n);
}

++setSize;
}

maxSequenceCount = Math.Max(maxSequenceCount, setSize);
}

return maxSequenceCount;
}

private class Bucket
{
public HashSet<Bucket> Neighbours = new HashSet<Bucket>();
}
}
```

• Absolutely nice idea. But the code is kind of long. Not sure if being able to finish this in an interview.

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