Added Day 9 code and input

AOC2021.Test/AOC2021.Test.csproj

@@ -66,6 +66,12 @@
     <None Update="Input\Day8_test.txt">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Update="Input\Day9_input.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
+    <None Update="Input\Day9_test.txt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>

AOC2021.Test/AOCTester.cs

@@ -18,20 +18,20 @@ namespace AOC2021.Test
 
             Console.WriteLine($"Testing {request.Day} Part A, Test data");
             if (!string.IsNullOrEmpty(request.Answer.Day_A_Test))
-                response.Answer.Day_A_Test = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = test, Version = AOCVersion.A }).Answer.ToString();
+                response.Answer.Day_A_Test = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = test, Version = AOCVersion.A, IgnoreLogMessages = true }).Answer.ToString();
             Console.WriteLine(response.Answer.Day_A_Test);
             Console.WriteLine($"Testing {request.Day} Part A, Input data");
             if (!string.IsNullOrEmpty(request.Answer.Day_A_Input))
-                response.Answer.Day_A_Input = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = input, Version = AOCVersion.A }).Answer.ToString();
+                response.Answer.Day_A_Input = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = input, Version = AOCVersion.A, IgnoreLogMessages = true }).Answer.ToString();
             Console.WriteLine(response.Answer.Day_A_Input);
 
             Console.WriteLine($"Testing {request.Day} Part B, Test data");
             if (!string.IsNullOrEmpty(request.Answer.Day_B_Test))
-                response.Answer.Day_B_Test = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = test, Version = AOCVersion.B }).Answer.ToString();
+                response.Answer.Day_B_Test = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = test, Version = AOCVersion.B, IgnoreLogMessages = true }).Answer.ToString();
             Console.WriteLine(response.Answer.Day_B_Test);
             Console.WriteLine($"Testing {request.Day} Part B, Input data");
             if (!string.IsNullOrEmpty(request.Answer.Day_B_Input))
-                response.Answer.Day_B_Input = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = input, Version = AOCVersion.B }).Answer.ToString();
+                response.Answer.Day_B_Input = GetAOCDay(request.Day).ExecuteDay(new AOCRequest() { Input = input, Version = AOCVersion.B, IgnoreLogMessages = true }).Answer.ToString();
             Console.WriteLine(response.Answer.Day_B_Input);
             return response;
         }

AOC2021.Test/DayTest.cs

@@ -76,7 +76,15 @@ namespace AOC2021.Tests
         [TestMethod]
         public void Day8()
         {
-            var request = new TestRequest() { Day = "day8", Answer = new Answer() { Day_A_Test = "26", Day_A_Input = "543", Day_B_Test = "", Day_B_Input = "" } };
+            var request = new TestRequest() { Day = "day8", Answer = new Answer() { Day_A_Test = "26", Day_A_Input = "543", Day_B_Test = "61229", Day_B_Input = "994266" } };
+            var result = _tester.Test(request);
+            Assert.IsTrue(request.Answer.Equals(result.Answer));
+        }
+
+        [TestMethod]
+        public void Day9()
+        {
+            var request = new TestRequest() { Day = "day9", Answer = new Answer() { Day_A_Test = "15", Day_A_Input = "577", Day_B_Test = "1134", Day_B_Input = "1069200" } };
             var result = _tester.Test(request);
             Assert.IsTrue(request.Answer.Equals(result.Answer));
         }

AOC2021.Test/Input/Day9_input.txt

@@ -0,0 +1,100 @@
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AOC2021.Test/Input/Day9_test.txt

@@ -0,0 +1,5 @@
+2199943210
+3987894921
+9856789892
+8767896789
+9899965678

AOC2021/Controllers/AdventOfCodeController.cs

@@ -27,6 +27,7 @@ namespace AOC2021.Controllers
         [Route("day6")]
         [Route("day7")]
         [Route("day8")]
+        [Route("day9")]
         public AOCResponse Day(AOCVersion version, [FromBody] string input, bool IgnoreLogMessages = false)
         {
             AOCRequest request = new AOCRequest() { Input = input, Version = version, IgnoreLogMessages = IgnoreLogMessages };

AOC2021/Days/Day8.cs

@@ -32,10 +32,17 @@ namespace AOC2021.Days
 
         protected override AOCResponse ExecutePartB()
         {
-            //be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb
-            new SSDGenerator("be cfbegad cbdgef fgaecd cgeb fdcge agebfd fecdb fabcd edb").Generate();
-
-
+            var sum = 0;
+            foreach (var line in GetSplitInput())
+            {
+                var inputNumbers = line.Split("|")[0].Trim();
+                var outputDigits = line.Split("|")[1].Trim();
+                var ssdGenerator = new SSDGenerator(inputNumbers);
+                ssdGenerator.Generate();
+                var digits = ssdGenerator.ConvertToNumbers(outputDigits);
+                sum += Convert.ToInt32(digits);
+            }
+            this._response.Answer = sum;
             return this._response;
         }
     }

AOC2021/Days/Day9.cs

@@ -0,0 +1,122 @@
+using AOC2021.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace AOC2021.Days
+{
+    public class Day9 : AOCDay
+    {
+        private int[][] _board;
+        private int _rowCount, _colCount;
+        protected override AOCResponse ExecutePartA()
+        {
+            CreateBoard();
+            int riskCount = 0;
+            var lowPoints = FindLowPoints();
+            foreach (var lP in lowPoints)
+            {
+                riskCount += 1 + _board[lP.Item1][lP.Item2];
+            }
+
+            this._response.Answer = riskCount;
+            return this._response;
+        }
+
+        protected override AOCResponse ExecutePartB()
+        {
+            CreateBoard();
+            var lowPoints = FindLowPoints();
+            var basinCount = new List<int>();
+            foreach (var lP in lowPoints)
+            {
+                var basin = GetBasin(lP.Item1, lP.Item2);
+                basinCount.Add(basin.Count());
+                Log($"LP: {lP.Item1},{lP.Item2} has a basin size of {basin.Count()}");
+                Log(string.Join(" ", basin.Select(bP => "(" + bP.Item1 + ", " + bP.Item2 + ")")));
+            }
+            //Order by int then take the top 3, and then multiple them together.
+            var product = basinCount.OrderByDescending(x => x).Take(3).Aggregate((total, next) => total * next);
+            this._response.Answer = product;
+            return this._response;
+        }
+
+        private List<Tuple<int,int>> FindLowPoints()
+        {
+            var lowPoints = new List<Tuple<int, int>>();
+            for (int x = 0; x < _rowCount; x++)
+            {
+                for (int y = 0; y < _colCount; y++)
+                {
+                    var surround = GetSurroundingPositions(x, y);
+                    bool isLowest = true;
+                    foreach (var t in surround)
+                    {
+                        if (_board[x][y] >= _board[t.Item1][t.Item2])
+                            isLowest = false;
+                    }
+                    if (isLowest)
+                    {
+                        lowPoints.Add(Tuple.Create(x, y));
+                        Log($"{x},{y} is a low point with value {_board[x][y]}!");
+                    }
+
+                }
+            }
+            return lowPoints;
+        }
+
+        private List<Tuple<int,int>> GetSurroundingPositions(int row, int column)
+        {
+            var positions = new List<Tuple<int, int>>();
+            for (int i = -1; i <= 1; i+=2)
+            {
+                if (row + i < _rowCount && row + i >= 0)
+                    positions.Add(new Tuple<int, int>(row + i, column));
+                if (column + i < _colCount && column + i >= 0)
+                    positions.Add(new Tuple<int, int>(row, column + i));
+            }
+            return positions;
+        }
+
+        private List<Tuple<int,int>> GetBasin(int x, int y)
+        {
+            List<Tuple<int, int>> basin = new List<Tuple<int, int>>();
+            AddBasin(Tuple.Create(x, y), basin);
+            return basin.Distinct().ToList();
+        }
+
+        private void AddBasin(Tuple<int,int> point, List<Tuple<int,int>> list)
+        {
+            foreach (var t in GetSurroundingPositionsThatAreNotNine(point.Item1, point.Item2).Except(list))
+            {
+                list.Add(t);
+                AddBasin(t, list);
+            }
+        }
+
+        private IEnumerable<Tuple<int, int>> GetSurroundingPositionsThatAreNotNine(int row, int column)
+        {
+            var positions = GetSurroundingPositions(row, column);
+            return positions.Where(x => _board[x.Item1][x.Item2] != 9);
+        }
+
+        private void CreateBoard()
+        {
+            var rows = new List<int[]>();
+            foreach (var line in GetSplitInput())
+            {
+                var columns = new List<int>();
+                foreach (var c in line)
+                {
+                    columns.Add(Convert.ToInt32(c.ToString()));
+                }
+                rows.Add(columns.ToArray());
+            }
+            _colCount = rows[0].Length;
+            _rowCount = rows.Count;
+            _board = rows.ToArray();
+        }
+    }
+}

AOC2021/Models/Day8/SSDGenerator.cs

@@ -31,6 +31,28 @@ namespace AOC2021.Models.Day8
                 _possibleLookup[ssd] = new List<SSD>();
             }
         }
+        public string ConvertToNumbers(string numbers)
+        {
+            var number = "";
+            foreach (var segments in numbers.Split(" "))
+            {
+                var constructedDigit = "";
+                foreach (var seg in segments)
+                {
+                    foreach (var l in _lookup)
+                    {
+                        if (l.Value == GetProperCode(seg))
+                        {
+                            constructedDigit += GetProperCode(l.Key);
+                            break;
+                        }
+                    }
+                        
+                }
+                number += ConvertToDigit(constructedDigit);
+            }
+            return number;
+        }
         public void Generate()
         {
             var one = GetPossibleNumbers(ONE).First();
@@ -56,17 +78,12 @@ namespace AOC2021.Models.Day8
             _possibleLookup[SSD.G] = GetPossibleSSD(possibleValuesForSegmentDG);
             DeducePossibleLookups(); //Since we have overlapping possible values, we deduce the correct ones and simplify
 
-            PrintOutLookup();
             //Now we address the ones with 6 segments, #0, #6, #9. They all have the same possible numbers, so just use #0 as lookup
             var zeroSixNinePossible = GetPossibleNumbers(ZERO);
-            var simplifiedZeroSixNine = zeroSixNinePossible.Select(x => RemoveKnownSSD(x)).ToArray();
+            var simplifiedZeroSixNine = zeroSixNinePossible.Select(x => RemoveKnownSSD(x)).ToArray(); //Remove all known values
             var possibleValuesForSegmentF = FindInCommon(simplifiedZeroSixNine); //F segment is in common with 0, 6, 9.
             _lookup[SSD.F] = GetProperCode(possibleValuesForSegmentF[0]); //Its a single char since its the only one in common with all 3 digits
-            PrintOutLookup();
             DeducePossibleLookups();
-            PrintOutLookup();
-            foreach (var l in simplifiedZeroSixNine)
-                Console.WriteLine(l);
         }
 
         private void DeducePossibleLookups()
@@ -281,6 +298,33 @@ namespace AOC2021.Models.Day8
                 return 'g';
             return ' ';
         }
+        private int ConvertToDigit(string s)
+        {
+            char[] characters = s.ToArray();
+            Array.Sort(characters);
+            s = new string(characters);
+            if (s.Equals(ZERO))
+                return 0;
+            if (s.Equals(ONE))
+                return 1;
+            if (s.Equals(TWO))
+                return 2;
+            if (s.Equals(THREE))
+                return 3;
+            if (s.Equals(FOUR))
+                return 4;
+            if (s.Equals(FIVE))
+                return 5;
+            if (s.Equals(SIX))
+                return 6;
+            if (s.Equals(SEVEN))
+                return 7;
+            if (s.Equals(EIGHT))
+                return 8;
+            if (s.Equals(NINE))
+                return 9;
+            return -1;
+        }
 
     }
 }