public void Move(String instruction)
{
Match m = InstructionRegex.Match(instruction);
char key = m.Groups[1].Value[0];
long value = long.Parse(m.Groups[2].Value);
switch (key)
{
case 'N':
case 'S':
case 'E':
case 'W':
m_Waypoint.Move(key, value);
break;
case 'L':
m_Waypoint.Rotate((int)(360 - value % 360));
break;
case 'R':
m_Waypoint.Rotate((int)(value % 360));
break;
case 'F':
Distance_NS += value * m_Waypoint.Distance_NS;
Distance_EW += value * m_Waypoint.Distance_EW;
break;
}
}
public int Solve()
{
var instructions = Input.SplitByNewLines().Select(line => InstructionRegex.Match(line));
var registers = new Dictionary <string, int>();
foreach (var instruction in instructions)
{
var registerToModify = instruction.Groups["targetreg"].Value;
var registerToTest = instruction.Groups["testreg"].Value;
var valueToTestAgainst = registers.ContainsKey(registerToTest) ? registers[registerToTest] : 0;
var valueToTest = int.Parse(instruction.Groups["testval"].Value);
var testSucceeded = false;
switch (instruction.Groups["cond"].Value)
{
case ">":
testSucceeded = valueToTestAgainst > valueToTest;
break;
case ">=":
testSucceeded = valueToTestAgainst >= valueToTest;
break;
case "==":
testSucceeded = valueToTestAgainst == valueToTest;
break;
case "!=":
testSucceeded = valueToTestAgainst != valueToTest;
break;
case "<":
testSucceeded = valueToTestAgainst < valueToTest;
break;
case "<=":
testSucceeded = valueToTestAgainst <= valueToTest;
break;
default:
throw new InvalidOperationException($"Unable to parse condition in {instruction.Value}");
}
var valueToChangeBy = testSucceeded ? int.Parse(instruction.Groups["val"].Value) : 0;
if (instruction.Groups["op"].Value == "dec")
{
valueToChangeBy = -valueToChangeBy;
}
registers[registerToModify] = (registers.ContainsKey(registerToModify) ? registers[registerToModify] : 0) + valueToChangeBy;
}
return(registers.Max(regWithValue => regWithValue.Value));
}