public static void PartOne()
{
Console.WriteLine("Day Ten - Part One");
List <int> adapters = PuzzleInputHelper.GetInputLines("DayTen.txt")
.Select(Int32.Parse).OrderBy(i => i).ToList();
Console.WriteLine($"There are {adapters.Count} adapters");
Console.WriteLine("Adapters in order:");
Console.WriteLine(String.Join(", ", adapters));
int oneDiff = 1;
int threeDiff = 1;
for (int i = 0; i < adapters.Count; i++)
{
if (i > 0)
{
if (adapters[i] - adapters[i - 1] == 1)
{
oneDiff++;
}
else if (adapters[i] - adapters[i - 1] == 3)
{
threeDiff++;
}
}
}
Console.WriteLine("Product of 1-differences and 3-differences: " + oneDiff * threeDiff);
Console.WriteLine("Day Ten - End of Part One");
}
public static void PartOne()
{
Console.WriteLine("Day seven - Part One");
List <BagRule> rules = PuzzleInputHelper.GetInputLines("DaySeven_Solene.txt")
.Select(BagRule.FromLine)
.ToList();
Console.WriteLine($"There are {rules.Count} rules");
List <string> countedBags = new List <string>();
Queue <string> bagsToCheck = new Queue <string>();
bagsToCheck.Enqueue("shiny gold");
while (bagsToCheck.Count > 0)
{
string currentBagToCheck = bagsToCheck.Dequeue();
countedBags.Add(currentBagToCheck);
var bagsAroundCurrent = rules.Where(br => br.CanContain(currentBagToCheck)).ToList();
bagsAroundCurrent.ForEach(bag => { if (!countedBags.Contains(bag.Color) && !bagsToCheck.Contains(bag.Color))
{
bagsToCheck.Enqueue(bag.Color);
}
});
}
Console.WriteLine($"There were {countedBags.Count} counted bags");
Console.WriteLine("Day seven - End of part One");
}
public static void PartTwo()
{
Console.WriteLine("Day Two - Part Two");
List <PasswordWithPolicy> passwords = PuzzleInputHelper.GetInputLines("DayTwo.txt")
.Select(PasswordWithPolicy.FromLine).ToList();
int validPasswords = passwords.Count(p => p.SatisfiesNewPolicy());
Console.WriteLine($"There are {validPasswords} valid passwords under new policy");
Console.WriteLine("Day Two - End of part Two");
}
public static void PartOne()
{
Console.WriteLine("Day eight - Part One");
OpcodeInstruction[] opcodes = PuzzleInputHelper.GetInputLines("DayEight.txt")
.Select(OpcodeInstruction.FromLine).ToArray();
OpcodeMachine opm = new OpcodeMachine(opcodes);
opm.Run();
Console.WriteLine("Day eight - End of part One");
}
public static void PartOne()
{
Console.WriteLine("Day one - Part One");
List <int> lines = PuzzleInputHelper.GetInputLines("DayOne.txt").Select(l => int.Parse(l)).ToList();
Console.WriteLine($"Input has {lines.Count} lines");
int prod = lines.SelectMany(a => lines.Select(b => (a + b, a * b)))
.Where(sum => sum.Item1 == 2020).First().Item2;
Console.WriteLine($"Product of lines with sum 2020 is {prod}");
Console.WriteLine("Day one - End of part One");
}
public static void PartTwo()
{
Console.WriteLine("Day seven - Part Two");
List <BagRule> rules = PuzzleInputHelper.GetInputLines("DaySeven.txt")
.Select(BagRule.FromLine)
.ToList();
int sumOfBags = rules.First(br => br.Color == "shiny gold").BagsInside(rules).Sum();
Console.WriteLine($"A shiny gold bag will contain {sumOfBags} bags in it");
Console.WriteLine("Day seven - End of Part Two");
}
public static void PartOne()
{
Console.WriteLine("Day Nine - Part One");
List <BigInteger> inputs = PuzzleInputHelper.GetInputLines("DayNine.txt")
.Select(BigInteger.Parse).ToList();
var valids = inputs.Select((value, index) =>
{
if (index < 25)
{
return(value, true);
}
return(value, GetValidSumsFor(inputs.Skip(index - 25).Take(25)).Contains(value));
});
Console.WriteLine($"The first number to not respect a valid sum is {valids.First(i => !i.Item2).Item1}");
Console.WriteLine("Day Nine - End of Part One");
}
//2037 too high
public static void PartTwo()
{
Console.WriteLine("Day eight - Part Two");
OpcodeInstruction[] opcodes = PuzzleInputHelper.GetInputLines("DayEight.txt")
.Select(OpcodeInstruction.FromLine).ToArray();
OpcodeMachine opm = new OpcodeMachine(opcodes);
try
{
opm.BreakLoop();
Console.WriteLine("Program terminated with accumulator = " + opm.Accumulator);
}
catch (Exception e)
{
Console.WriteLine(e);
}
Console.WriteLine("Day eight - End of Part Two");
}
public static void PartTwo()
{
Console.WriteLine("Day Nine - Part Two");
List <BigInteger> inputs = PuzzleInputHelper.GetInputLines("DayNine.txt")
.Select(BigInteger.Parse).ToList();
BigInteger answerToPartOne = 373803594;
BigInteger runningSum = inputs[0];
int minIndex = 0;
int maxIndex = 0;
while (runningSum != answerToPartOne)
{
if (runningSum > answerToPartOne || runningSum < 0)
{
runningSum -= inputs[minIndex];
minIndex++;
}
else if (runningSum < answerToPartOne)
{
maxIndex++;
runningSum += inputs[maxIndex];
}
}
Console.WriteLine($"Sum of numbers between {minIndex} and {maxIndex} indexes are {answerToPartOne}");
BigInteger sum = 0;
BigInteger min = 0;
BigInteger max = 0;
for (int i = minIndex; i < maxIndex + 1; i++)
{
if (min == 0 || inputs[i] < min)
{
min = inputs[i];
}
if (max < inputs[i])
{
max = inputs[i];
}
sum += inputs[i];
}
Console.WriteLine($"Sum is {sum}");
Console.WriteLine($"min + max = {min + max}");
Console.WriteLine("Day Nine - End of Part Two");
}