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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;
}
string getNextValidInstruction(string &line)
string getNextValidInstruction(string &line, const bool considerConditionals, bool &doMultiplication)
{
while (true) {
{
size_t startPosition = line.find("mul(");
if (startPosition == string::npos) {
size_t mulPosition = line.find("mul(");
if (mulPosition == string::npos) {
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(',');
@ -74,20 +98,34 @@ int getInstructionResult(const string &instruction)
return number1 * number2;
}
int main()
int getResult(vector<string> lines, const bool considerConditionals)
{
vector<string> lines = readInput();
int finalResult = 0;
int result = 0;
bool doMultiplication = true;
for (string &line : lines) {
while (true) {
string instruction = getNextValidInstruction(line);
string instruction = getNextValidInstruction(line,
considerConditionals,
doMultiplication);
if (instruction == "") {
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;
}