day8
This commit is contained in:
matthias@arch
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8/.gitignore
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8/.gitignore
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day8
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11
8/README.md
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8/README.md
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# [Day 8](https://adventofcode.com/2022/day/8)
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:gift::gift::gift::gift::gift::gift::gift::gift:
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Today's language: **C++**
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I hope we are not missing the wood for the trees...
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```shell
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gcc main.cpp -o day8 -O3 forest.txt
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./day8
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```
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99
8/forest.txt
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8/forest.txt
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142
8/main.cpp
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#include <cstdio>
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#include <fstream>
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#include <sstream>
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#include <set>
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#include <string>
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#include <algorithm>
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class Forest {
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public:
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Forest(std::string&& forestS) : forest(std::move(forestS)) {
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lineLength = forest.find('\n') + 1;
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lineCount = std::count(forest.begin(), forest.end(), '\n') + 1;
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}
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char at(unsigned x, unsigned y) const { return forest.at(x + lineLength * y); }
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void set(unsigned x, unsigned y, char c) { forest[x + lineLength * y] = c; }
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unsigned getXTreeCount() const { return lineLength - 1; }
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unsigned getYTreeCount() const { return lineCount - 1; }
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const std::string& getForest() const { return forest; }
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private:
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std::string forest;
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unsigned lineLength;
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unsigned lineCount;
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};
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std::string readFileToString(const char* filename) {
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std::ifstream file(filename);
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if (file.is_open()){
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std::ostringstream ss;
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file >> ss.rdbuf();
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return ss.str();
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}
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return "";
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}
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struct XY {
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unsigned x;
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unsigned y;
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operator unsigned long() {
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return *reinterpret_cast<unsigned long*>(this);
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}
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};
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template<typename F>
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void insertVisibleTrees(const Forest& forest, std::set<unsigned long>& visibleTrees, unsigned startX, unsigned startY, F&& increment) {
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char previousMaxHeight = '0' - 1;
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char currentHeight = '0';
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while (startX < forest.getXTreeCount() and startY < forest.getYTreeCount()) {
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currentHeight = forest.at(startX, startY);
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/* std::cout << "insertVisibleTrees() at x=" << startX << ", y=" << startY << ", char=" << currentHeight << ", visibleTreeCount=" << visibleTrees.size() << std::endl; */
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if (forest.at(startX, startY) > previousMaxHeight) {
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visibleTrees.insert(XY{startX, startY});
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previousMaxHeight = currentHeight;
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}
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increment(startX, startY);
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}
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}
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template<typename F>
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inline unsigned getDirectionalScenicScore(const Forest& forest, unsigned x, unsigned y, char maxHeight, F&& increment) {
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unsigned scenicScore = 1;
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increment(x, y);
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while (x != INT32_MAX and y != INT32_MAX and x < forest.getXTreeCount() and y < forest.getYTreeCount()) {
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if (forest.at(x, y) >= maxHeight) { return scenicScore; }
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scenicScore++;
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increment(x, y);
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}
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return scenicScore-1;
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}
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unsigned getScenicScore(const Forest& forest, unsigned treeX, unsigned treeY) {
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unsigned scenicScore = 1;
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char maxHeight = forest.at(treeX, treeY);
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scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ x++; });
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if (scenicScore == 0) { return 0; }
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scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ x--; });
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if (scenicScore == 0) { return 0; }
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scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ y++; });
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if (scenicScore == 0) { return 0; }
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scenicScore *= getDirectionalScenicScore(forest, treeX, treeY, maxHeight, [](unsigned& x, unsigned& y){ y--; });
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return scenicScore;
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}
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int main(int argc, char** argv) {
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// only the ones inside
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std::set<unsigned long> visibleTrees;
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if (argc != 2) {
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printf("Need exactly one argument, the filename\n");
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return 1;
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}
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Forest forest(readFileToString(argv[1]));
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unsigned totalTreeCount = forest.getXTreeCount() * forest.getYTreeCount();
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printf("Analyzing forest with [%d, %d] trees in [x, y] direction and a total tree count of %d.\n", forest.getXTreeCount(), forest.getYTreeCount(), totalTreeCount);
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for (unsigned y = 0; y < forest.getYTreeCount(); y++) {
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// border trees
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visibleTrees.insert(XY{0, y});
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visibleTrees.insert(XY{forest.getXTreeCount() - 1, y});
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// from left to right;
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insertVisibleTrees(forest, visibleTrees, 0, y, [](unsigned& x_, unsigned&y_){ x_++; });
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// from right to left
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insertVisibleTrees(forest, visibleTrees, forest.getXTreeCount() - 1, y, [](unsigned& x_, unsigned&y_){ x_--; });
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}
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for (unsigned x = 0; x < forest.getXTreeCount(); x++) {
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// border trees
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visibleTrees.insert(XY{x, 0});
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visibleTrees.insert(XY{x, forest.getYTreeCount() - 1});
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// from top to bottom
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insertVisibleTrees(forest, visibleTrees, x, 0, [](unsigned& x_, unsigned&y_){ y_++; });
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// from bottom to top
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insertVisibleTrees(forest, visibleTrees, x, forest.getYTreeCount() - 1, [](unsigned& x_, unsigned&y_){ y_--; });
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}
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std::string visualizedForestStr(totalTreeCount + forest.getYTreeCount() - 1, '_'); // +y for the newlines
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for (unsigned i = 0; i < forest.getYTreeCount() - 1; i++) { // set newlines
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visualizedForestStr[i * (forest.getXTreeCount() + 1) + forest.getXTreeCount()] = '\n';
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}
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unsigned visibleTreeCount = visibleTrees.size();
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Forest visualizedForest(std::move(visualizedForestStr));
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for (auto it = visibleTrees.begin(); it != visibleTrees.end(); it++) {
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unsigned long copy = *it;
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XY tree = *reinterpret_cast<XY*>(©);
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visualizedForest.set(tree.x, tree.y, 'X');
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}
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printf("%s\n", visualizedForest.getForest().c_str());
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XY bestTree{};
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unsigned maxScenicScore = 0;
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// task 2
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for (unsigned x = 1; x < forest.getXTreeCount() - 1; x++) {
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for (unsigned y = 1; y < forest.getYTreeCount() - 1; y++) {
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unsigned scenicScore = getScenicScore(forest, x, y);
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if (scenicScore > maxScenicScore) {
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bestTree.x = x;
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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);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user