From 36477f05be690af8c7e4d443ffd36992499d52b8 Mon Sep 17 00:00:00 2001 From: "matthias@arch" Date: Fri, 9 Dec 2022 00:34:08 +0100 Subject: [PATCH] day8 --- 8/.gitignore | 1 + 8/README.md | 11 ++++ 8/forest.txt | 99 +++++++++++++++++++++++++++++++++++ 8/main.cpp | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++ README.md | 2 +- 5 files changed, 254 insertions(+), 1 deletion(-) create mode 100644 8/.gitignore create mode 100644 8/README.md create mode 100644 8/forest.txt create mode 100644 8/main.cpp diff --git a/8/.gitignore b/8/.gitignore new file mode 100644 index 0000000..4448d5e --- /dev/null +++ b/8/.gitignore @@ -0,0 +1 @@ +day8 diff --git a/8/README.md b/8/README.md new file mode 100644 index 0000000..6873e8c --- /dev/null +++ b/8/README.md @@ -0,0 +1,11 @@ +# [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 +``` diff --git a/8/forest.txt b/8/forest.txt new file mode 100644 index 0000000..87193f8 --- /dev/null +++ b/8/forest.txt @@ -0,0 +1,99 @@ +301220120123412411222431204050154502352345215611331265331250145342122214525502214010044420343123123 +212320323343022012341342154350405334001503310300211115153234405042152322215224432102400231113311111 +201121301211224101311542432232543306541420361630235333011410624063304221040115102553044222124011231 +232202332000223341510415415041456543552366532665005356434300206166046103153010034420344343011033113 +210314434121343443320133105330346640420462134535200335545300063363254665242325230054401312222330003 +230214144101224050540112215100230300363531055535606540515103053341534215435154012112140240124100110 +231101440201215435252051416446206332423151420012651331143355655244262555053300034015013244122130030 +214222212324200401052120065613545410604234254167572224245015316613164134265153313214432220442033121 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+011201113143220302144232532235500205436316601263264003140631445266055502252414045114101420043032302 diff --git a/8/main.cpp b/8/main.cpp new file mode 100644 index 0000000..9faaedc --- /dev/null +++ b/8/main.cpp @@ -0,0 +1,142 @@ +#include +#include +#include +#include +#include +#include + +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(this); + } +}; + +template +void insertVisibleTrees(const Forest& forest, std::set& 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 +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 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(©); + 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); +} diff --git a/README.md b/README.md index 54d76b0..6dbde87 100644 --- a/README.md +++ b/README.md @@ -22,7 +22,7 @@ Also, check out the repositories of my friends who do stuff in go, Visual Basic, - **Assembly, x86-64**: day 4 - **Bash**: day 1, 7 - **C**: day 3, 4 -- **C++**: day 2 +- **C++**: day 2, 8 - **Javascript**: day 6 - **Python**: day 5 - **VIM-Script**: day 3