private int FindNounAndVerb(IList <int> initialMemory)
{
IList <int> memory = ListUtil.DeepCopy(initialMemory);
int noun = 0;
int verb = 0;
bool validNounAndVerb = false;
while (!validNounAndVerb)
{
for (int i = 0; i < 100 && !validNounAndVerb; i++)
{
for (int j = 0; j < 100 && !validNounAndVerb; j++)
{
noun = i;
verb = j;
memory[1] = noun;
memory[2] = verb;
IList <int> finalMemory = intcodeCPU.ApplyOperations(memory);
if (finalMemory[0] == 19690720)
{
validNounAndVerb = true;
}
}
}
}
return(100 * noun + verb);
}
public IList <int> ApplyOperations(IList <int> initialMemory)
{
IList <int> memory = ListUtil.DeepCopy(initialMemory);
int instructionPointer = 0;
for (int i = 0; memory[i] != 99; i += instructionPointer)
{
int instruction = memory[i];
int parameterOne = memory[i + 1];
int parameterTwo = memory[i + 2];
int parameterThree = memory[i + 3];
switch (instruction)
{
case 1:
int additionResult = memory[parameterOne] + memory[parameterTwo];
memory[parameterThree] = additionResult;
instructionPointer = 4;
break;
case 2:
int multiplicationResult = memory[parameterOne] * memory[parameterTwo];
memory[parameterThree] = multiplicationResult;
instructionPointer = 4;
break;
}
}
return(memory);
}
private int RestoreGravityAssist(IList <int> initialMemory)
{
IList <int> memory = ListUtil.DeepCopy(initialMemory);
int noun = 12;
int verb = 2;
memory[1] = noun;
memory[2] = verb;
IList <int> finalMemory = intcodeCPU.ApplyOperations(memory);
return(finalMemory[0]);
}