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Solve 2024 day 3 part 2

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SebastianStork 2024-12-11 21:04:46 +01:00
parent 1840ec7360
commit 55e7f3c862
1 changed files with 48 additions and 10 deletions
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58
2024/day-03/main.cpp
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@ -23,15 +23,39 @@ bool isNumber(const string &potentialNumber)
return true; return true;
} }
string getNextValidInstruction(string &line) string getNextValidInstruction(string &line, const bool considerConditionals, bool &doMultiplication)
{ {
while (true) { while (true) {
{ {
size_t startPosition = line.find("mul("); size_t mulPosition = line.find("mul(");
if (startPosition == string::npos) { if (mulPosition == string::npos) {
return ""; return "";
} }
line.erase(0, startPosition);
if (considerConditionals) {
size_t doPosition = line.find("do()");
size_t dontPosition = line.find("don't()");
if ((doPosition < mulPosition) && (dontPosition < mulPosition)) {
if (doPosition > dontPosition) {
doMultiplication = true;
} else {
doMultiplication = false;
}
} else {
if (doPosition < mulPosition) {
doMultiplication = true;
} else if (dontPosition < mulPosition) {
doMultiplication = false;
}
}
}
line.erase(0, mulPosition);
}
if (considerConditionals && !doMultiplication) {
line.erase(0, 4);
continue;
} }
size_t commaPosition = line.find(','); size_t commaPosition = line.find(',');
@ -74,20 +98,34 @@ int getInstructionResult(const string &instruction)
return number1 * number2; return number1 * number2;
} }
int main() int getResult(vector<string> lines, const bool considerConditionals)
{ {
vector<string> lines = readInput(); int result = 0;
int finalResult = 0; bool doMultiplication = true;
for (string &line : lines) { for (string &line : lines) {
while (true) { while (true) {
string instruction = getNextValidInstruction(line); string instruction = getNextValidInstruction(line,
considerConditionals,
doMultiplication);
if (instruction == "") { if (instruction == "") {
break; break;
} }
finalResult += getInstructionResult(instruction); result += getInstructionResult(instruction);
} }
} }
cout << "Sum of all the multiplication: " << finalResult << endl; return result;
}
int main()
{
vector<string> lines = readInput();
// Part one
cout << "Sum of all the multiplication: " << getResult(lines, false) << endl;
// Part two
cout << "Sum of all the multiplication (when taking the conditional statements into account): "
<< getResult(lines, true) << endl;
} }