Algorithm week 7 challenge

Program.cs

using System;
using System.Linq;

namespace minimumDifference
{
    class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine(Program.getMinimumDifference(new string[] { "16:15", "16:00", "12:20" }));
        }

        public static int getMinimumDifference(string[] times)
        {
            if (times.Length == 0)
            {
                return 0;
            }

            var validTimes = times
                .Where(time => Program.getTimeInMinutes(time).HasValue)
                .Select(time => Program.getTimeInMinutes(time).Value)
                .ToArray();
            
            if (validTimes.Length == 0)
            {
                throw new InvalidOperationException("No valid input exists");
            }

            if (validTimes.Length == 1)
            {
                return validTimes[0];
            }

            Array.Sort(validTimes);

            int? minimumDifference = null;

            for (var i = 0; i < validTimes.Length - 1; i++)
            {
                var diff = validTimes[i+1] - validTimes[i];
                if (!minimumDifference.HasValue) {
                    minimumDifference = diff;
                    continue;
                }

                if (diff < minimumDifference)
                {
                    minimumDifference = diff;
                }    
            }

            return minimumDifference.GetValueOrDefault();
        }

        private static int? getTimeInMinutes(string time)
        {
            var parts = time.Split(":");
            if (parts.Length != 2)
            {
                return null;
            }

            try
            {
                var hour = Convert.ToInt32(parts[0]);
                var mins = Convert.ToInt32(parts[1]);

                if (hour < 0 || hour > 23 || mins < 0 || mins > 59)
                {
                    return null;
                }

                return hour * 60 + mins;
            }
            catch (FormatException)
            {
                return null;
            }
        }
    }
}

Hello @chygoz2, congratulations 🎉 your solution has been selected as one of the winning solutions in Week 7 of #AlgorithmFridays. Your solution is clean and readable and passed the test cases.

Out of the many winning solutions, only 3 will be selected for the $20 prize in a raffle draw. The raffle draw will hold today, Friday May 28 at 3.00pm WAT (7.00 am PST)

If you are interested in being a part of the raffle draw, please send me a DM on Twitter @meekg33k so I can share the event invite with you.

NB: Only solutions of participants who indicated interest in the raffle draw will be considered.

Thanks once again for participating and see you later today for Week 8 of #AlgorithmFridays.

Thank you @meekg33k