04

04/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+set(CMAKE_CXX_STANDARD 14)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+enable_language(CXX)
+
+project(AoC04)
+
+if(APPLE)
+    include_directories(/usr/local/include)
+    link_directories(/usr/local/lib)
+endif()
+
+if(WIN32)
+	add_executable(${CMAKE_PROJECT_NAME} WIN32)
+else()
+	add_executable(${CMAKE_PROJECT_NAME})
+endif()
+
+target_sources(${CMAKE_PROJECT_NAME}
+	PRIVATE main.cpp
+	)

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04/main.cpp

@@ -0,0 +1,168 @@
+#include <array>
+#include <fstream>
+#include <iostream>
+#include <sstream>
+#include <vector>
+
+class Bingo {
+public:
+    Bingo() = default;
+    ~Bingo() = default;
+
+    void addNumberToCard(int number) {
+        card[numbers / 5][numbers % 5] = {number, false};
+        numbers += 1;
+    }
+
+    void checkNumber(int number) {
+        if(hasWon()) {
+            invalidate();
+            return;
+        }
+        for(int i = 0; i < 5; i++) {
+            for(int j = 0; j < 5; j++) {
+                if(card[i][j].first == number) {
+                    card[i][j].second = true;
+                    checkWin(number);
+                    return;
+                }
+            }
+        }
+    }
+
+    bool hasWon() {
+        return won;
+    }
+
+    int getWinningScore() {
+        return winning_score;
+    }
+
+    void printSelf() {
+        std::cout << std::endl;
+        for(int i = 0; i < 5; i++) {
+            for(int j = 0; j < 5; j++) {
+                if(card[i][j].second) {
+                    std::cout << "*";
+                }
+                std::cout << card[i][j].first << " ";
+            }
+            std::cout << std::endl;
+        }
+        std::cout << std::endl;
+    }
+
+    bool isValid() {
+        return valid;
+    }
+
+private:
+    void checkWin(int multiplier) {
+        for(int i = 0; i < 5; i++) {
+            int horizontal = 0;
+            int vertical = 0;
+            for(int j = 0; j < 5; j++) {
+                if(card[i][j].second) {
+                    horizontal += 1;
+                }
+                if(card[j][i].second) {
+                    vertical += 1;
+                }
+            }
+            if(horizontal == 5 || vertical == 5) {
+                won = true;
+                calculateScore(multiplier);
+            }
+        }
+    }
+
+    void calculateScore(int multiplier) {
+        int score = 0;
+        for(int i = 0; i < 5; i++) {
+            for(int j = 0; j < 5; j++) {
+                if(!card[i][j].second) {
+                    score += card[i][j].first;
+                }
+            }
+        }
+        winning_score = score * multiplier;
+    }
+
+    void invalidate() {
+        valid = false;
+    }
+
+
+    std::array<std::array<std::pair<int,bool>, 5>, 5> card;
+    int numbers = 0;
+    bool won = false;
+    int winning_score = -1;
+    bool valid = true;
+};
+
+std::pair<std::vector<int>, std::vector<Bingo>> getBingo(const std::string &file_name) {
+    std::pair<std::vector<int>, std::vector<Bingo>> result;
+
+    std::ifstream file(file_name);
+    int tmp{};
+    char tmp_char{};
+    std::string str;
+    std::getline(file, str);
+    std::stringstream ss(str);
+    while(ss >> tmp) {
+        result.first.push_back(tmp);
+        ss >> tmp_char;
+    }
+    while (std::getline(file, str)) {
+        if(str.empty()) {
+            result.second.emplace_back();
+            continue;
+        }
+        std::stringstream ss2(str);
+        for(int i = 0; i < 5; i++) {
+            ss2 >> tmp;
+            result.second.back().addNumberToCard(tmp);
+        }
+    }
+    return result;
+}
+
+int part1(const std::vector<int> &numbers, std::vector<Bingo> &bingo) {
+    for(auto &number : numbers) {
+        for(auto &card : bingo) {
+            card.checkNumber(number);
+            if(card.hasWon()) {
+                return card.getWinningScore();
+            }
+        }
+    }
+    return -1;
+}
+
+int part2(const std::vector<int> &numbers, std::vector<Bingo> &bingo) {
+    int last_score = -1;
+    for(auto &number : numbers) {
+        for(auto &card : bingo) {
+            card.checkNumber(number);
+            if(card.hasWon() && card.isValid()) {
+                last_score = card.getWinningScore();
+            }
+        }
+    }
+    return last_score;
+}
+
+int main(int argc, char **argv) {
+    if (argc < 2) {
+        std::cerr << "You must provide input file!" << std::endl;
+        return 1;
+    }
+    auto input = getBingo(argv[1]);
+    auto &numbers = input.first;
+    auto &bingo = input.second;
+    std::cout << "The winning score of the first winning card is \033[91;1m"
+              << part1(numbers, bingo) << "\033[0m." << std::endl;
+    std::cout << "The winning score of the last winning card is \033[91;1m"
+              << part2(numbers, bingo) << "\033[0m." << std::endl;
+    return 0;
+}