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add a few more solutions

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simon
2024-12-13 16:04:54 +01:00
parent 5b9ad5766b
commit 7ec5c32e47
15 changed files with 985 additions and 0 deletions
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14
Level7/Level7.csproj Normal file
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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net9.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
<ItemGroup>
<ProjectReference Include="../Common/Common.csproj" />
</ItemGroup>
</Project>

25
Level7/Level7.sln Normal file
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Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.002.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Level7", "Level7.csproj", "{B69CB5AF-BF4D-4425-A20B-3E95D2E0EABB}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{B69CB5AF-BF4D-4425-A20B-3E95D2E0EABB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{B69CB5AF-BF4D-4425-A20B-3E95D2E0EABB}.Debug|Any CPU.Build.0 = Debug|Any CPU
{B69CB5AF-BF4D-4425-A20B-3E95D2E0EABB}.Release|Any CPU.ActiveCfg = Release|Any CPU
{B69CB5AF-BF4D-4425-A20B-3E95D2E0EABB}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {3F192730-CD0E-42EA-89C1-94B84247D113}
EndGlobalSection
EndGlobal

239
Level7/Level7Solver.cs Normal file
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namespace AoC24;
using AoC24.Common;
using AoCLevelInputProvider;
using Parsing;
using Parsing.Data;
using Parsing.Schema;
public enum Operator
{
Multiply,
Add,
Concatenate,
}
public class Equation
{
private List<int> operands;
private List<Operator> operators;
public Equation(List<int> operands)
{
this.operands = new List<int>();
this.operands.AddRange(operands);
this.operators = new List<Operator>();
}
private Equation(List<int> operands, List<Operator> operators)
{
this.operands = new List<int>();
this.operands.AddRange(operands);
this.operators = new List<Operator>();
this.operators.AddRange(operators);
}
public void AddOperator(Operator op)
{
this.operators.Add(op);
}
public bool CanHoldMoreOperators()
{
return this.operators.Count < (this.operands.Count - 1);
}
public long Solve()
{
long result = this.operands[0];
for(int i = 0; i < this.operators.Count; i++)
{
switch(this.operators[i])
{
case Operator.Add:
result = result + (this.operands[i+1]);
break;
case Operator.Multiply:
result = result * (this.operands[i+1]);
break;
default:
throw new Exception("This should never be reached");
}
}
return result;
}
public long Solve2()
{
long result = this.operands[0];
for(int i = 0; i < this.operators.Count; i++)
{
switch(this.operators[i])
{
case Operator.Add:
result = result + (this.operands[i+1]);
break;
case Operator.Multiply:
result = result * (this.operands[i+1]);
break;
case Operator.Concatenate:
result = result * (long)Math.Pow(10, (this.operands[i+1].ToString().Length)) + this.operands[i+1];
break;
default:
throw new Exception("This should never be reached");
}
}
return result;
}
public Equation Clone()
{
return new Equation(this.operands, this.operators);
}
}
public class EquationBuilder
{
public long TestValue;
private List<int> operands;
private List<Operator> operatorOptions;
private List<Equation> SolvableEquations = new List<Equation>();
public EquationBuilder(long testValue, params Operator[] operatorOptions)
{
this.TestValue = testValue;
this.operands = new List<int>();
this.operatorOptions = new List<Operator>();
this.operatorOptions.AddRange(operatorOptions);
}
public void AddOperand(int operand)
{
this.operands.Add(operand);
}
private List<Equation> BuildEquationCandidates(Equation e)
{
List<Equation> resultEquations = new List<Equation>();
if(!e.CanHoldMoreOperators())
{
resultEquations.Add(e);
}
else
{
foreach(var op in this.operatorOptions)
{
var newEquation = e.Clone();
newEquation.AddOperator(op);
resultEquations.AddRange(BuildEquationCandidates(newEquation));
}
}
return resultEquations;
}
public bool FindSolutions()
{
var allPossibleEquations = BuildEquationCandidates(new Equation(this.operands));
foreach(var equation in allPossibleEquations)
{
if(equation.Solve() == this.TestValue)
{
this.SolvableEquations.Add(equation);
}
}
return this.SolvableEquations.Any();
}
public bool FindSolutions2()
{
var allPossibleEquations = BuildEquationCandidates(new Equation(this.operands));
foreach(var equation in allPossibleEquations)
{
if(equation.Solve2() == this.TestValue)
{
this.SolvableEquations.Add(equation);
}
}
return this.SolvableEquations.Any();
}
}
public class Level7Solver : FullTextLevelSolverBase
{
public override int LevelNumber
{
get { return 7; }
}
private long ParseLong(string word)
{
return long.Parse(word.Replace(":", ""));
}
protected override InputSchemaBuilder DefineInputSchema(InputSchemaBuilder schemaBuilder)
{
return schemaBuilder
.Expect(InputType.Custom, InputType.Long, this.ParseLong)
.Repeat()
.Expect(InputType.Long)
.EndRepetition();
}
public override string SolveFirstStar()
{
var equationBuilders = this.GetData()
.Filter(InputType.Long)
.AsListRows<long>()
.TransformData((List<long> inputs) => {
var eb = new EquationBuilder(inputs[0], Operator.Multiply, Operator.Add);
for(int i = 1; i < inputs.Count; i++)
{
eb.AddOperand((int)inputs[i]);
}
return eb;
});
long totalSum = 0;
foreach(var equationBuilder in equationBuilders)
{
if(equationBuilder.FindSolutions())
{
totalSum += equationBuilder.TestValue;
}
}
return totalSum.ToString();
}
public override string SolveSecondStar()
{
var equationBuilders = this.GetData()
.Filter(InputType.Long)
.AsListRows<long>()
.TransformData((List<long> inputs) => {
var eb = new EquationBuilder(inputs[0], Operator.Multiply, Operator.Add, Operator.Concatenate);
for(int i = 1; i < inputs.Count; i++)
{
eb.AddOperand((int)inputs[i]);
}
return eb;
});
long totalSum = 0;
foreach(var equationBuilder in equationBuilders)
{
if(equationBuilder.FindSolutions2())
{
totalSum += equationBuilder.TestValue;
}
}
return totalSum.ToString();
}
}

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Level7/Program.cs Normal file
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// See https://aka.ms/new-console-template for more information
using AoC24;
var levelSolver = new Level7Solver();
var solution1 = levelSolver.SolveFirstStar();
var solution2 = levelSolver.SolveSecondStar();
if (!string.IsNullOrEmpty(solution1))
{
Console.WriteLine("Solution for example 1 is: " + solution1);
}
else
{
Console.WriteLine("Example 1 has not been solved yet!");
}
if (!string.IsNullOrEmpty(solution2))
{
Console.WriteLine("Solution for example 2 is: " + solution2);
}
else
{
Console.WriteLine("Example 2 has not been solved yet!");
}