74 lines
2.7 KiB
C#
74 lines
2.7 KiB
C#
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using System;
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using System.Collections;
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namespace Advent24
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{
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internal class Program
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{
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static void Main(string[] args)
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{
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string fileData = System.IO.File.ReadAllText(@"..\..\..\inputd1.txt");
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var pairsArray = fileData.Split('\n');
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var list1 = new SortedList<Int32, Int32>(pairsArray.Length);
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var list2 = new SortedList<Int32, Int32>(pairsArray.Length);
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foreach(var pair in pairsArray)
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{
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if (System.String.IsNullOrEmpty(pair)) continue;
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// pairArray has 4 elements, and the middle two are blanks
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// because there are 3 spaces between the two numbers
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var pairArray = pair.Split(' ');
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Int32 myInteger = System.Convert.ToInt32(pairArray[0]);
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if (list1.TryGetValue(myInteger, out int value1)) list1[myInteger] = ++value1;
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else list1.Add(myInteger, 1);
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Console.WriteLine("{0:d} {1:d}", myInteger, list1[myInteger]);
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myInteger = System.Convert.ToInt32(pairArray[3]);
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if (list2.TryGetValue(myInteger, out int value2)) list2[myInteger] = ++value2;
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else list2.Add(myInteger, 1);
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Console.WriteLine("{0:d} {1:d}", myInteger, list2[myInteger]);
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}
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Int32 sumOfDifferences = 0;
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Int32 i = 0, j = 0;
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var list1Copy = new SortedList<Int32, Int32>(list1);
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var list2Copy = new SortedList<Int32, Int32>(list2);
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while (i < list1.Count && j < list2.Count)
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{
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Int32 value1 = list1.GetKeyAtIndex(i);
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Int32 value2 = list2.GetKeyAtIndex(j);
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if (value1 > value2) sumOfDifferences += (value1 - value2);
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else sumOfDifferences += (value2 - value1);
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list1[value1]--; list2[value2]--;
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if (list1[value1] == 0) i++;
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if (list2[value2] == 0) j++;
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}
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Console.WriteLine("{0:s} {1:d}", "Sum of differences = ", sumOfDifferences);
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i = 0; Int32 similarityScore = 0;
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while (i < list1Copy.Count)
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{
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Int32 value1 = list1Copy.GetKeyAtIndex(i);
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list2Copy.TryGetValue(value1, out Int32 numberOfAppearancesInList2);
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// default value of Int32 numberOfAppearancesInList2 is 0
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similarityScore += value1 * numberOfAppearancesInList2;
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list1Copy[value1]--;
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if (list1Copy[value1] == 0) i++;
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}
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Console.WriteLine("{0:s} {1:d}", "Similarity score = ", similarityScore);
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Console.ReadLine();
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}
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}
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}
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