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Solve 2024 day 2 part 2

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SebastianStork 2024-12-06 13:30:44 +01:00
parent e5e96bea8b
commit 87a50f0bef
1 changed files with 47 additions and 15 deletions
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52
2024/day-02/main.cpp
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@ -17,22 +17,50 @@ void readInput(vector<vector<int>> &list)
}
}
int calculateNumberOfSafeReports(const vector<vector<int>> &list)
int getIndexOfUnsafeValue(const vector<int> &report)
{
int numberOfSafeReports = 0;
for (vector<int> report : list) {
bool safe = true;
const int MAX_SAFE_DIFFERENCE = 3;
int directionOfChange = (report[0] < report[1]) ? 1 : -1;
int directionOfChange = (report.front() < report.back()) ? 1 : -1;
for (size_t i = 0; i < report.size() - 1; i++) {
int levelDifference = (report[i + 1] - report[i]) * directionOfChange;
if (levelDifference <= 0 || levelDifference > MAX_SAFE_DIFFERENCE) {
return i;
}
}
if (levelDifference <= 0 || levelDifference > 3) {
safe = false;
break;
return -1;
}
bool isSafeReport(const vector<int> &report, const bool applyDampener)
{
int indexOfUnsafeValue = getIndexOfUnsafeValue(report);
if (indexOfUnsafeValue == -1) {
return true;
}
numberOfSafeReports += safe;
if (!applyDampener) {
return false;
}
vector<int> tempReport = report;
int unsafeValue = report[indexOfUnsafeValue];
tempReport.erase(tempReport.begin() + indexOfUnsafeValue);
if (getIndexOfUnsafeValue(tempReport) == -1) {
return true;
}
tempReport.insert(tempReport.begin() + indexOfUnsafeValue, unsafeValue);
tempReport.erase(tempReport.begin() + indexOfUnsafeValue + 1);
return getIndexOfUnsafeValue(tempReport) == -1;
}
int calculateNumberOfSafeReports(const vector<vector<int>> &list, const bool applyDampener)
{
int numberOfSafeReports = 0;
for (const vector<int> &report : list) {
numberOfSafeReports += isSafeReport(report, applyDampener);
}
return numberOfSafeReports;
}
@ -43,5 +71,9 @@ int main()
readInput(list);
// Part one
cout << "Number of safe reports: " << calculateNumberOfSafeReports(list) << endl;
cout << "Number of safe reports: " << calculateNumberOfSafeReports(list, false) << endl;
// Part two
cout << "Number of safe reports (when taking the dampener into account): "
<< calculateNumberOfSafeReports(list, true) << endl;
}