public void RunProgramTest()
{
// Test examples taken from https://adventofcode.com/2019/day/2
// Here are the initial and final states of a few more small programs:
// 1,0,0,0,99 becomes 2,0,0,0,99 (1 + 1 = 2).
// 2,3,0,3,99 becomes 2,3,0,6,99 (3 * 2 = 6).
// 2,4,4,5,99,0 becomes 2,4,4,5,99,9801 (99 * 99 = 9801).
// 1,1,1,4,99,5,6,0,99 becomes 30,1,1,4,2,5,6,0,99.
var testData = new List <Tuple <int[], int[]> >(new Tuple <int[], int[]>[] {
new Tuple <int[], int[]>(new int[] { 1, 0, 0, 0, 99 }, new int[] { 2, 0, 0, 0, 99 }),
new Tuple <int[], int[]>(new int[] { 2, 3, 0, 3, 99 }, new int[] { 2, 3, 0, 6, 99 }),
new Tuple <int[], int[]>(new int[] { 2, 4, 4, 5, 99, 0 }, new int[] { 2, 4, 4, 5, 99, 9801 }),
new Tuple <int[], int[]>(new int[] { 1, 1, 1, 4, 99, 5, 6, 0, 99 }, new int[] { 30, 1, 1, 4, 2, 5, 6, 0, 99 }),
});
foreach (var testExample in testData)
{
var computer = new IntcodeComputer();
computer.LoadProgram(testExample.Item1);
var programStatus = computer.RunProgram();
var result = computer.GetProgramCopy();
Assert.Equal(IntcodeProgramStatus.Completed, programStatus);
Assert.Equal(testExample.Item2.Select(d => (BigInteger)d), result);
}
}
public static int GetDay2Part2Answer()
{
// The inputs should still be provided to the program by replacing
// the values at addresses 1 and 2, just like before. In this program,
// the value placed in address 1 is called the noun, and the value
// placed in address 2 is called the verb. Each of the two input
// values will be between 0 and 99, inclusive.
// Once the program has halted, its output is available at address 0,
// also just like before. Each time you try a pair of inputs, make
// sure you first reset the computer's memory to the values in the
// program (your puzzle input) - in other words, don't reuse memory
// from a previous attempt.
//
// Find the input noun and verb that cause the program to produce
// the output 19690720. What is 100 * noun + verb?
// (For example, if noun=12 and verb=2, the answer would be 1202.)
// Answer: 2254
var initialProgram = GetDay2Input();
int verb = 0;
bool foundResult = false;
int noun;
for (noun = 0; noun <= 99; noun++)
{
for (verb = 0; verb <= 99; verb++)
{
initialProgram[1] = noun;
initialProgram[2] = verb;
var computer = new IntcodeComputer();
computer.LoadProgram(initialProgram);
computer.RunProgram();
var result = computer.GetProgramCopy();
if (result[0] == 19690720)
{
foundResult = true;
break;
}
}
if (foundResult)
{
break;
}
}
return((100 * noun) + verb);
}
public static BigInteger GetDay2Part1Answer()
{
// Once you have a working computer, the first step is to restore
// the gravity assist program (your puzzle input) to the "1202
// program alarm" state it had just before the last computer caught
// fire.
// To do this, before running the program, replace position 1 with
// the value 12 and replace position 2 with the value 2.
// What value is left at position 0 after the program halts?
// Answer: 11590668
var program = GetDay2Input();
program[1] = 12;
program[2] = 2;
var computer = new IntcodeComputer();
computer.LoadProgram(program);
computer.RunProgram();
return(computer.GetProgramCopy()[0]);
}
