public class Solution {    public int FindMinDifference(IList
     
       timePoints) {        var ary = new int[24 * 60];            foreach (var time in timePoints)            {                var tp = time.Split(':');                var hour = tp[0];                var minute = tp[1];                var h = Convert.ToInt32(hour[0].ToString()) * 10 + Convert.ToInt32(hour[1].ToString());                var m = Convert.ToInt32(minute[0].ToString()) * 10 + Convert.ToInt32(minute[1].ToString());                var index = h * 60 + m;                if (ary[index] == 1)                {                    return 0;                }                else                {                    ary[index] = 1;                }            }            var min = int.MaxValue;            bool first = true;            var firstNum = int.MaxValue;            var lastNum = int.MinValue;            var pre = 0;            for (int i = 0; i < ary.Length; i++)            {                if (ary[i] == 1)                {                    if (first)                    {                        pre = i;                        first = false;                        firstNum = i;                        continue;                    }                    var diff = Math.Abs(i - pre);                    if (diff > 1440 / 2)                    {                        diff = 1440 - diff;                    }                    if (min > diff)                    {                        min = diff;                    }                    pre = i;                    lastNum = i;                }            }            min = Math.Min(min, (24 * 60 - lastNum + firstNum));            return min;    }}