Add AoC 2025 project structure and first solutions

2025-12-04 21:40:42 +01:00
parent c83642d286
commit 1e98d90c33
15 changed files with 754 additions and 0 deletions
@@ -0,0 +1,88 @@
+using System;
+using System.IO;
+using System.Linq;
+using AdvenOfCode.Contracts;
+
+namespace AoC_2025;
+
+public class Day03 : IPuzzleSolver<long>
+{
+    private string[] ParsePuzzleInput(string path)
+    {
+        var puzzleInput = File.ReadAllLines(path)
+            .Where(line => !string.IsNullOrWhiteSpace(line))
+            .ToArray();
+        return puzzleInput;
+    }
+
+    public long SolvePart1(string pathToPuzzleInput)
+    {
+        var batterieBankStrings = ParsePuzzleInput(pathToPuzzleInput);
+        var batterieBanks = batterieBankStrings.Select(bbs => ParseBatterieBank(bbs));
+        var voltages = batterieBanks.Select(bb => FindMaxVoltage(bb));
+        var sumVoltages = voltages.Sum();
+        return sumVoltages;
+    }
+    
+    public long SolvePart2(string pathToPuzzleInput)
+    {
+        const int voltageLength = 12;
+        var batterieBankStrings = ParsePuzzleInput(pathToPuzzleInput);
+        var batterieBanks = batterieBankStrings.Select(bbs => ParseBatterieBank(bbs));
+        var voltages = batterieBanks.Select(bb => GetMaxSuperVoltage(bb, voltageLength));
+        var sumVoltages = voltages.Sum();
+        return sumVoltages;
+    }
+
+    private int[] ParseBatterieBank(string batterieBank)
+    {
+        return batterieBank
+            .Select(c => new string(c, 1))
+            .Select(value => int.Parse(value))
+            .ToArray();
+    }
+
+    private long FindMaxVoltage(Span<int> batterieBank)
+    {
+        var (firstNumber, position) = GetMax(batterieBank[..^1]);
+        var (secondNumber, _) = GetMax(batterieBank[(position + 1)..]);
+        var voltage = Combine(firstNumber, secondNumber);
+        return voltage;
+    }
+
+    private long Combine(long first, long second)
+    {
+        return (first * 10) + second;
+    }
+    
+    private long GetMaxSuperVoltage(Span<int> batterieBank, int voltageLength)
+    {
+        var indexedVoltageLength = voltageLength - 1;
+        var currentBankPosition = 0;
+        var superVoltage = 0L;
+        for (var i = 0; i < voltageLength; i++)
+        {
+            var (max, numberPosition) = GetMax(batterieBank[currentBankPosition..^(indexedVoltageLength - i)]);
+            superVoltage = Combine(superVoltage, max);
+            currentBankPosition += numberPosition + 1;
+        }
+
+        return superVoltage;
+    }
+
+    private (int max, int currentPosition) GetMax(Span<int> batterieBank)
+    {
+        var max = batterieBank[0];
+        var currentPosition = 0;
+        for (var i = 1; i < batterieBank.Length; i++)
+        {
+            if (max < batterieBank[i])
+            {
+                max = batterieBank[i];
+                currentPosition = i;
+            }
+        }
+
+        return (max, currentPosition);
+    }
+}