Day 4.txt

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            string[] elfPairs = input.Split("\r\n");
            List<string[]> elfPairList = new List<string[]>();
            foreach (string s in elfPairs)
            {
                string[] temp = s.Split(",");
                elfPairList.Add(temp);
            }
            int resultCounter = 0;
            foreach (string[] elfPair in elfPairList)
            {
                string[] elf1 = elfPair[0].Split("-");
                string[] elf2 = elfPair[1].Split("-");
                if (Convert.ToInt32(elf1[0]) <= Convert.ToInt32(elf2[0]) &&
                    Convert.ToInt32(elf1[1]) >= Convert.ToInt32(elf2[1]))
                {
                    resultCounter++;
                }
                else if (Convert.ToInt32(elf2[0]) <= Convert.ToInt32(elf1[0]) &&
                    Convert.ToInt32(elf2[1]) >= Convert.ToInt32(elf1[1]))
                {
                    resultCounter++;
                }
            }
            Console.WriteLine(resultCounter);