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day8

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matthias@arch 2022-12-09 00:34:08 +01:00
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day8

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# [Day 8](https://adventofcode.com/2022/day/8)
:gift::gift::gift::gift::gift::gift::gift::gift:
Today's language: **C++**
I hope we are not missing the wood for the trees...
```shell
gcc main.cpp -o day8 -O3 forest.txt
./day8
```

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#include <cstdio>
#include <fstream>
#include <sstream>
#include <set>
#include <string>
#include <algorithm>
class Forest {
public:
Forest(std::string&& forestS) : forest(std::move(forestS)) {
lineLength = forest.find('\n') + 1;
lineCount = std::count(forest.begin(), forest.end(), '\n') + 1;
}
char at(unsigned x, unsigned y) const { return forest.at(x + lineLength * y); }
void set(unsigned x, unsigned y, char c) { forest[x + lineLength * y] = c; }
unsigned getXTreeCount() const { return lineLength - 1; }
unsigned getYTreeCount() const { return lineCount - 1; }
const std::string& getForest() const { return forest; }
private:
std::string forest;
unsigned lineLength;
unsigned lineCount;
};
std::string readFileToString(const char* filename) {
std::ifstream file(filename);
if (file.is_open()){
std::ostringstream ss;
file >> ss.rdbuf();
return ss.str();
}
return "";
}
struct XY {
unsigned x;
unsigned y;
operator unsigned long() {
return *reinterpret_cast<unsigned long*>(this);
}
};
template<typename F>
void insertVisibleTrees(const Forest& forest, std::set<unsigned long>& visibleTrees, unsigned startX, unsigned startY, F&& increment) {
char previousMaxHeight = '0' - 1;
char currentHeight = '0';
while (startX < forest.getXTreeCount() and startY < forest.getYTreeCount()) {
currentHeight = forest.at(startX, startY);
/* std::cout << "insertVisibleTrees() at x=" << startX << ", y=" << startY << ", char=" << currentHeight << ", visibleTreeCount=" << visibleTrees.size() << std::endl; */
if (forest.at(startX, startY) > previousMaxHeight) {
visibleTrees.insert(XY{startX, startY});
previousMaxHeight = currentHeight;
}
increment(startX, startY);
}
}
template<typename F>
inline unsigned getDirectionalScenicScore(const Forest& forest, unsigned x, unsigned y, char maxHeight, F&& increment) {
unsigned scenicScore = 1;
increment(x, y);
while (x != INT32_MAX and y != INT32_MAX and x < forest.getXTreeCount() and y < forest.getYTreeCount()) {
if (forest.at(x, y) >= maxHeight) { return scenicScore; }
scenicScore++;
increment(x, y);
}
return scenicScore-1;
}
unsigned getScenicScore(const Forest& forest, unsigned treeX, unsigned treeY) {
unsigned scenicScore = 1;
char maxHeight = forest.at(treeX, treeY);
scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ x++; });
if (scenicScore == 0) { return 0; }
scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ x--; });
if (scenicScore == 0) { return 0; }
scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ y++; });
if (scenicScore == 0) { return 0; }
scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ y--; });
return scenicScore;
}
int main(int argc, char** argv) {
// only the ones inside
std::set<unsigned long> visibleTrees;
if (argc != 2) {
printf("Need exactly one argument, the filename\n");
return 1;
}
Forest forest(readFileToString(argv[1]));
unsigned totalTreeCount = forest.getXTreeCount() * forest.getYTreeCount();
printf("Analyzing forest with [%d, %d] trees in [x, y] direction and a total tree count of %d.\n", forest.getXTreeCount(), forest.getYTreeCount(), totalTreeCount);
for (unsigned y = 0; y < forest.getYTreeCount(); y++) {
// border trees
visibleTrees.insert(XY{0, y});
visibleTrees.insert(XY{forest.getXTreeCount() - 1, y});
// from left to right;
insertVisibleTrees(forest, visibleTrees, 0, y, [](unsigned& x_, unsigned&y_){ x_++; });
// from right to left
insertVisibleTrees(forest, visibleTrees, forest.getXTreeCount() - 1, y, [](unsigned& x_, unsigned&y_){ x_--; });
}
for (unsigned x = 0; x < forest.getXTreeCount(); x++) {
// border trees
visibleTrees.insert(XY{x, 0});
visibleTrees.insert(XY{x, forest.getYTreeCount() - 1});
// from top to bottom
insertVisibleTrees(forest, visibleTrees, x, 0, [](unsigned& x_, unsigned&y_){ y_++; });
// from bottom to top
insertVisibleTrees(forest, visibleTrees, x, forest.getYTreeCount() - 1, [](unsigned& x_, unsigned&y_){ y_--; });
}
std::string visualizedForestStr(totalTreeCount + forest.getYTreeCount() - 1, '_'); // +y for the newlines
for (unsigned i = 0; i < forest.getYTreeCount() - 1; i++) { // set newlines
visualizedForestStr[i * (forest.getXTreeCount() + 1) + forest.getXTreeCount()] = '\n';
}
unsigned visibleTreeCount = visibleTrees.size();
Forest visualizedForest(std::move(visualizedForestStr));
for (auto it = visibleTrees.begin(); it != visibleTrees.end(); it++) {
unsigned long copy = *it;
XY tree = *reinterpret_cast<XY*>(&copy);
visualizedForest.set(tree.x, tree.y, 'X');
}
printf("%s\n", visualizedForest.getForest().c_str());
XY bestTree{};
unsigned maxScenicScore = 0;
// task 2
for (unsigned x = 1; x < forest.getXTreeCount() - 1; x++) {
for (unsigned y = 1; y < forest.getYTreeCount() - 1; y++) {
unsigned scenicScore = getScenicScore(forest, x, y);
if (scenicScore > maxScenicScore) {
bestTree.x = x;
bestTree.y = y;
maxScenicScore = scenicScore;
}
}
}
printf("In this forest, there are %u visible trees\n", visibleTreeCount);
printf("The tree with the best scenic score is at [%d, %d] and has a score of %d\n", bestTree.x, bestTree.y, maxScenicScore);
}

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@ -22,7 +22,7 @@ Also, check out the repositories of my friends who do stuff in go, Visual Basic,
- **Assembly, x86-64**: day 4 - **Assembly, x86-64**: day 4
- **Bash**: day 1, 7 - **Bash**: day 1, 7
- **C**: day 3, 4 - **C**: day 3, 4
- **C++**: day 2 - **C++**: day 2, 8
- **Javascript**: day 6 - **Javascript**: day 6
- **Python**: day 5 - **Python**: day 5
- **VIM-Script**: day 3 - **VIM-Script**: day 3