12

2022/12/Makefile

@@ -0,0 +1,16 @@
+CXX ?= c++
+CXXFLAGS ?= -std=c++11 -Wall -Wextra -pedantic -O2
+PROJECT = bfs
+
+all: ${PROJECT}
+
+${PROJECT}: main.cpp
+	${CXX} ${CXXFLAGS} -o $@ $^
+
+test: ${PROJECT}
+	./${PROJECT}
+
+clean:
+	${RM} *.o ${PROJECT}
+
+.PHONY: all clean test

2022/12/input

@@ -0,0 +1,41 @@
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+abcccccccaaaaacccaaaaaaaacccaaccccaaaaaaccccccccccccaaaaaaaaaaaaaaaacaaaaaaaccaaaaaaccccccaaaaaccccccccccccccaaaaaaaaaaccaccccccccccccccccccccccccaccccccccccccccca
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+abccccccaaaaaaccccaaacaaaaaaaaaaaaccaaccccccaaaaaccccccccccccccccccccccccccccccccccccccccccaaccccccaaccccccccccccaacaaaaaaaccccccccccckklpppppplllmdddddddddacccccc
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+abccccaaacaaacccccccccccccaaaaaaccccccccccccaaaaaacccccccccccccccccaaaccccccccccccccccccccccccccccaaaaccccccccccccaaaaaaaaaaccccccccckkkppppuppppmmmmmmmmddeeeacccc
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+abcccccaaaaaaccccccccccccaaaaaaaacaaccccccccccaaaccccccccccccccccccaaaaccccccccccccccccccccaaaaccccccccccccccccccaaaaaaaacccccccccckkkkpppuuuuupqqqqqqqmmmmeeeccccc
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+abccccaaaaaaaaaccccccccccccccaaaaaacccccccacaacccccccccccccccccccccccccccccccccccccaaaaaacccaaaccccccccccaaaaccaaaaaaacccccccccckkkkrrrrruuuxxuvvvvvvqqqqnnneeccccc
+abcccaaaaaaaaaaccccccccccccccaaaaaaaacccccaaaaacccccccccccccccaaaaaccccccccccccccccaaaaaaccccccccccccccccaaaaaaaaaaaaacccccccccjjjkrrrrruuuxxxxvvvvvvvqqqnnneeccccc
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+SbaaaaacccccccaaaaaaaccaaaacccccccccccccccaaaaaaaaacccccccccccaaaaaaccccccccccccccccccccccccccccccccccccccccccccccaacccaaaaaacjjjrrrtttxxxEzzzzyyyvvvrrnnneeecccccc
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+abcccccccccccccccccccccccccccaaaaccccccccccaaaccaaaaaaaccccccaaaaccaacaaaccccccccaaaaacccccccccaaaaaaaaccaaacacccccaaaaaacccccccccciiqqqssssssspposrrroooofffaccccc
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+abcccaaaaaaacccaaaccccccccccccccccccccccccccccccccccccccccccaaaaaccccccccccccccccaaaaaaccccccaaacaaaccccaaaaaacccccccaacccccaaaaaacciiipppppppphgggggggggggaaaacccc
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+abccaaaaaaacaaaaaaaaaacccccccccccccccccccccaaaccccccacccccccccccccccccaaccccccccccccccccccccccccaaaaccccaaaaaaccccccccccccccaaaaacccciihhhhhhhhhhgggggggccaaccccccc
+abccccaaaaaaaaaaaaaaacccccccccccccccccccaaaaaaaaccccaaacaaaccccccccccaaaaccaaccccccccaacaacccccaaaaaaacccaacccccccccccccccccaacaaccccchhhhhhhhhaaaacccccccccccccccc
+abccccaaaaaacaaaaaaaccccccccccccccccccccaaaaaaaaccccaaaaaaaccccccccccaaaaaaaacaccccccaaaaaccccccaaaaacccccccccccccccccccccccccccccccccchhhhhhacaaaaaccccccccccccccc
+abccccaaccccccaaaaaacccccccccccccaaccccccaaaaaacccccaaaaaaccccccaaaaaaaaaaaaaaaccccccaaaaaacccaaaaaaacccccccccccccccccccccccccccccccccccccaaaaccaaacccccccccccaaaca
+abccccccccccccaaaaaaaccccccccccccaaccccccaaaaaacccaaaaaaaaccccccaaaaaaaaaaaaaacccccccaaaaaacccaaaaaaaaccccccaaacccccccccccccccccccccccccccaaaaccccccccccccccccaaaaa
+abccaaacccccccaaacaaacccccccccaaaaaaaacccaaaaaacccaaaaaaaaacccccaaaaaaaaaaaaaacccccccaaaaaccccaaaaaaaaccccccaaaaccccccccccccccccccccccccccaaaccccccccccccccccccaaaa
+abcaaaacccccccaaccccccccccccccaaaaaaaacccaaccaacccaaaaaaaaaaccccccccaaaaaaacaacccccccccaaaccccccaaacaaccccccaaaacccccccccccccccccccccccccccccccccccccccccccccaaaaaa

2022/12/main.cpp

@@ -0,0 +1,115 @@
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+struct Point {
+    size_t x;
+    size_t y;
+};
+
+struct Position {
+    int elevation;
+    bool visited;
+};
+
+struct MazeInput {
+    std::vector<std::vector<Position>> maze;
+    Point start;
+};
+
+MazeInput getMaze( std::ifstream &file ) {
+    std::vector<std::vector<Position>> maze{};
+    Point start{};
+    std::string str;
+    int y = -1;
+    while ( std::getline( file, str ) ) {
+        y++;
+        maze.emplace_back();
+        int x = -1;
+        for ( auto &c : str ) {
+            x++;
+            switch ( c ) {
+            case 'S':
+                maze.back().push_back( { 1, false } );
+                start.y = y;
+                start.x = x;
+                break;
+            case 'E':
+                maze.back().push_back( { 27, false } );
+                break;
+            default:
+                maze.back().push_back( { c - 'a' + 1, false } );
+            }
+        }
+    }
+    return { maze, start };
+}
+
+struct BFSEntry {
+    Point point;
+    int path_len;
+};
+
+int BFS( std::vector<std::vector<Position>> &maze, const Point &start ) {
+    std::deque<BFSEntry> entries = { { start, 0 } };
+    maze[start.y][start.x].visited = true;
+    while ( !entries.empty() ) {
+        for ( int y = -1; y < 2; y++ ) {
+            for ( int x = -1; x < 2; x++ ) {
+                if ( y != 0 && x != 0 ) {
+                    continue;
+                }
+                Point next_point = { entries.front().point.x + x,
+                                     entries.front().point.y + y };
+                if ( next_point.y < 0 || next_point.y >= maze.size() ||
+                     next_point.x < 0 || next_point.x >= maze[0].size() ) {
+                    continue;
+                }
+                if ( !maze[next_point.y][next_point.x].visited &&
+                     ( maze[next_point.y][next_point.x].elevation -
+                       maze[entries.front().point.y][entries.front().point.x].elevation ) <= 1 ) {
+                    if ( maze[next_point.y][next_point.x].elevation == 27 ) {
+                        return entries.front().path_len + 1;
+                    }
+                    maze[next_point.y][next_point.x].visited = true;
+                    entries.push_back(
+                        { next_point, 1 + entries.front().path_len } );
+                }
+            }
+        }
+        entries.pop_front();
+    }
+    return -1;
+}
+
+int part1( const std::vector<std::vector<Position>> &maze,
+           const Point &start ) {
+    auto maze_copy = maze;
+    return BFS( maze_copy, start );
+}
+
+int part2( const std::vector<std::vector<Position>> &maze ) {
+    int min = -1;
+    for ( size_t y = 0; y < maze.size(); y++ ) {
+        for ( size_t x = 0; x < maze[0].size(); x++ ) {
+            if ( maze[y][x].elevation == 1 ) {
+                auto maze_copy = maze;
+                auto path = BFS( maze_copy, { x, y } );
+                if ( path != -1 && ( path < min || min == -1 ) ) {
+                    min = path;
+                }
+            }
+        }
+    }
+    return min;
+}
+
+int main() {
+    std::ifstream input_file( "input" );
+    auto input = getMaze( input_file );
+    std::cout << "Part 1 result is \033[91;1m"
+              << part1( input.maze, input.start ) << "\033[0m." << std::endl;
+    std::cout << "Part 2 result is \033[91;1m" << part2( input.maze )
+              << "\033[0m." << std::endl;
+}