09
This commit is contained in:
parent
556a3953e8
commit
1f93c6e67c
22
09/CMakeLists.txt
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22
09/CMakeLists.txt
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cmake_minimum_required(VERSION 3.10)
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set(CMAKE_CXX_STANDARD 14)
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set(CMAKE_CXX_STANDARD_REQUIRED True)
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set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
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enable_language(CXX)
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project(AoC09)
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if(APPLE)
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include_directories(/usr/local/include)
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link_directories(/usr/local/lib)
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endif()
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if(WIN32)
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add_executable(${CMAKE_PROJECT_NAME} WIN32)
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else()
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add_executable(${CMAKE_PROJECT_NAME})
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endif()
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target_sources(${CMAKE_PROJECT_NAME}
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PRIVATE main.cpp
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)
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100
09/input
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100
09/input
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174
09/main.cpp
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174
09/main.cpp
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#include <algorithm>
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#include <fstream>
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#include <iostream>
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#include <set>
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#include <sstream>
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#include <vector>
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#include <deque>
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class Point : public std::pair<uint64_t, uint64_t> {
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public:
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Point(uint64_t x, uint64_t y) : std::pair<uint64_t, uint64_t>(x, y) {}
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int getHeight(const std::vector<std::vector<int>> &heights) const {
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return heights[first][second];
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}
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uint64_t getX() const {
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return first;
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}
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uint64_t getY() const {
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return second;
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}
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};
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std::vector<std::vector<int>> getHeights(const std::string &file_name) {
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std::vector<std::vector<int>> heights;
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std::ifstream file(file_name);
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std::string str;
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while (std::getline(file, str)) {
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heights.emplace_back();
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for (auto &height : str) {
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heights.back().push_back(height - '0');
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}
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}
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return heights;
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}
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std::vector<Point> getLowPoints(const std::vector<std::vector<int>> &heights) {
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std::vector<Point> low_points{};
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for (size_t i = 1; i < heights.size() - 1; i++) {
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for (size_t j = 1; j < heights[i].size() - 1; j++) {
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auto &point = heights[i][j];
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if (heights[i][j - 1] > point && heights[i][j + 1] > point &&
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heights[i - 1][j] > point && heights[i + 1][j] > point) {
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low_points.emplace_back(i, j);
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}
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}
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}
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for (size_t i = 1; i < heights[0].size() - 1; i++) {
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if (heights[0][i - 1] > heights[0][i] &&
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heights[0][i + 1] > heights[0][i] &&
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heights[1][i] > heights[0][i]) {
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low_points.emplace_back(0, i);
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}
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if (heights[heights.size() - 1][i - 1] >
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heights[heights.size() - 1][i] &&
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heights[heights.size() - 1][i + 1] >
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heights[heights.size() - 1][i] &&
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heights[heights.size() - 2][i] > heights[heights.size() - 1][i]) {
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low_points.emplace_back(heights.size() - 1, i);
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}
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}
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for (size_t i = 1; i < heights.size() - 1; i++) {
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if (heights[i - 1][0] > heights[i][0] &&
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heights[i + 1][0] > heights[i][0] &&
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heights[i][1] > heights[i][0]) {
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low_points.emplace_back(i, 0);
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}
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if (heights[i - 1][heights[0].size() - 1] >
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heights[i][heights[0].size() - 1] &&
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heights[i + 1][heights[0].size() - 1] >
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heights[i][heights[0].size() - 1] &&
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heights[i][heights[0].size() - 2] >
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heights[i][heights[0].size() - 1]) {
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low_points.emplace_back(i, heights[0].size() - 1);
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}
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}
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if (heights[0][1] > heights[0][0] && heights[1][0] > heights[0][0]) {
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low_points.emplace_back(0, 0);
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}
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if (heights[heights.size() - 1][1] > heights[heights.size() - 1][0] &&
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heights[heights.size() - 2][0] > heights[heights.size() - 1][0]) {
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low_points.emplace_back(heights.size() - 1, 0);
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}
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if (heights[0][heights[0].size() - 2] > heights[0][heights[0].size() - 1] &&
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heights[1][heights[0].size() - 1] > heights[0][heights[0].size() - 1]) {
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low_points.emplace_back(0, heights[0].size() - 1);
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}
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if (heights[heights.size() - 1][heights[0].size() - 2] >
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heights[heights.size() - 1][heights[0].size() - 1] &&
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heights[heights.size() - 2][heights[0].size() - 1] >
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heights[heights.size() - 1][heights[0].size() - 1]) {
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low_points.emplace_back(heights.size() - 1, heights[0].size() - 1);
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}
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return low_points;
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}
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std::vector<std::set<Point>>
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getBasins(const std::vector<std::vector<int>> &heights,
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const std::vector<Point> &low_points) {
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std::vector<std::set<Point>> result{};
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for (auto &point : low_points) {
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std::set<Point> basin{};
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std::deque<Point> basin_deque{};
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basin_deque.push_back(point);
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while (basin_deque.size() != 0) {
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const auto &working_point = basin_deque.front();
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basin.insert(working_point);
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for (int i = -1; i < 2; i += 1) {
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for (int j = -1; j < 2; j += 1) {
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if ((i != 0 && j != 0) || (i == 0 && j == 0)) {
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continue;
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}
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auto new_point = Point(working_point.getX() + i,
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working_point.getY() + j);
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if (new_point.getX() == (uint64_t)-1 ||
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new_point.getX() >= heights.size()) {
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continue;
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}
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if (new_point.getY() == (uint64_t)-1 ||
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new_point.getY() >= heights[0].size()) {
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continue;
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}
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if (basin.find(new_point) != basin.end()) {
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continue;
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}
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if (new_point.getHeight(heights) == 9) {
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continue;
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||||
}
|
||||
basin_deque.push_back(new_point);
|
||||
}
|
||||
}
|
||||
basin_deque.pop_front();
|
||||
}
|
||||
result.push_back(std::move(basin));
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
uint64_t part1(const std::vector<std::vector<int>> &heights,
|
||||
const std::vector<Point> &low_points) {
|
||||
uint64_t score = 0;
|
||||
for (const auto &point : low_points) {
|
||||
score += point.getHeight(heights) + 1;
|
||||
}
|
||||
return score;
|
||||
}
|
||||
|
||||
uint64_t part2(const std::vector<std::vector<int>> &heights,
|
||||
const std::vector<Point> &low_points) {
|
||||
auto basins = getBasins(heights, low_points);
|
||||
std::vector<uint64_t> sizes{};
|
||||
for (auto &basin : basins) {
|
||||
sizes.push_back(basin.size());
|
||||
}
|
||||
std::sort(sizes.begin(), sizes.end());
|
||||
std::reverse(sizes.begin(), sizes.end());
|
||||
return sizes[0] * sizes[1] * sizes[2];
|
||||
}
|
||||
|
||||
int main(int argc, char **argv) {
|
||||
if (argc < 2) {
|
||||
std::cerr << "You must provide input file!" << std::endl;
|
||||
return 1;
|
||||
}
|
||||
auto heights = getHeights(argv[1]);
|
||||
auto low_points = getLowPoints(heights);
|
||||
std::cout << "There sum of low points risks is \033[91;1m"
|
||||
<< part1(heights, low_points) << "\033[0m." << std::endl;
|
||||
std::cout << "There product of three largest basins is \033[91;1m"
|
||||
<< part2(heights, low_points) << "\033[0m." << std::endl;
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user