CODE

public class Solution {
  public int LongestConsecutive(int[] nums) {

    Array.Sort(nums);
    int longestSequence = 1;
    int lastNumber = 0;
    int lS = 1;

    if (nums.Length < 1)
      return 0;

    for (int i = 0; i < nums.Length; i++)
    {
      if (i == 0)
      {
        lastNumber = nums[0];
        Console.WriteLine("Initial val, lastNumber = " + lastNumber);                
        continue;
      }
      else if (nums[i] == lastNumber)
      {
        Console.WriteLine("Repeated val = " + nums[i]);                
        continue;
      }
      else if (nums[i] == lastNumber + 1)
      {                
        longestSequence++;
        lastNumber = nums[i];
        Console.WriteLine("Longest sequence = " + longestSequence);                
      }
      else
      {
        if (lS < longestSequence)
          lS = longestSequence;
        longestSequence = 1;
        lastNumber = nums[i];
        Console.WriteLine("Pattern broke");                
      }
    }
    if (lS < longestSequence)
      lS = longestSequence;
    return lS;        
  }
}