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SebastianStork 2025-01-06 17:12:41 +01:00
parent 3c40f13cfc
commit 4adbe68617
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147
2024/day-03/main.cpp
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@ -1,147 +0,0 @@
#include <iostream>
#include <vector>
using namespace std;
vector<string> readInput()
{
vector<string> lines;
string line;
while (getline(cin, line)) {
lines.push_back(line);
}
return lines;
}
bool isNumber(const string &potentialNumber)
{
for (const char c : potentialNumber) {
if (!isdigit(c)) {
return false;
}
}
return true;
}
string getNextValidInstruction(string &line, bool *doMultiplication = nullptr)
{
const bool considerConditionals = doMultiplication;
while (true) {
{
size_t mulPosition = line.find("mul(");
if (mulPosition == string::npos) {
return "";
}
if (considerConditionals) {
size_t doPosition = line.find("do()");
size_t dontPosition = line.find("don't()");
if ((doPosition < mulPosition) && (dontPosition < mulPosition)) {
*doMultiplication = doPosition > dontPosition;
} 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(',');
if (commaPosition == string::npos) {
return "";
}
size_t closingBracketPosition = line.find(')');
if (closingBracketPosition == string::npos) {
return "";
}
int lengthOfNumber1 = commaPosition - 4;
int lengthOfNumber2 = closingBracketPosition - commaPosition - 1;
if ((lengthOfNumber1 < 1 || lengthOfNumber1 > 3)
|| (lengthOfNumber2 < 1 || lengthOfNumber2 > 3)) {
line.erase(0, 4);
continue;
}
if (!isNumber(line.substr(4, lengthOfNumber1))
|| !isNumber(line.substr(commaPosition + 1, lengthOfNumber2))) {
line.erase(0, 4);
continue;
}
string validInstruction = line.substr(0, closingBracketPosition + 1);
line.erase(0, closingBracketPosition + 1);
return validInstruction;
}
}
int getInstructionResult(const string &instruction)
{
size_t commaPosition = instruction.find(',');
int number1 = stoi(instruction.substr(4, commaPosition - 4));
int number2 = stoi(
instruction.substr(commaPosition + 1, instruction.length() - commaPosition - 1));
return number1 * number2;
}
int calculateSumIgnoringConditionals(vector<string> lines)
{
int result = 0;
for (string &line : lines) {
while (true) {
string instruction = getNextValidInstruction(line);
if (instruction.empty()) {
break;
}
result += getInstructionResult(instruction);
}
}
return result;
}
int calculateSumConsideringConditionals(vector<string> lines)
{
int result = 0;
bool doMultiplication = true;
for (string &line : lines) {
while (true) {
string instruction = getNextValidInstruction(line, &doMultiplication);
if (instruction.empty()) {
break;
}
result += getInstructionResult(instruction);
}
}
return result;
}
int main()
{
vector<string> lines = readInput();
// Part one
cout << "Sum of all the multiplications: " << calculateSumIgnoringConditionals(lines) << endl;
// Part two
cout << "Sum of all the multiplications (when taking the conditional statements into account): "
<< calculateSumConsideringConditionals(lines) << endl;
}