Day 2: Part 1

Aufgabe 2/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.31)
+project(Aufgabe_2)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_executable(Aufgabe_2 main.cpp)

Aufgabe 2/input_example.txt

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+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9

Aufgabe 2/main.cpp

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+#include <iostream>
+#include <vector>
+#include <fstream>
+
+std::vector<std::string> readTextFromFile(const std::string& fileName) {
+    std::vector<std::string> lines;
+    std::ifstream file(fileName);
+    if (!file) {  // Überprüft, ob die Datei geöffnet werden konnte
+        std::cerr << "Fehler: Datei konnte nicht geöffnet werden: " << fileName << std::endl;
+        return lines;
+    }
+    std::string s;
+    while(getline(file, s)) {
+        lines.push_back(s);
+    }
+    return lines;
+}
+
+std::vector<std::string> splitString(const std::string& input, char ch) {
+    std::vector<std::string> splittedString;
+    size_t pos = input.find(ch);
+    size_t initialPos = 0;
+
+    while(pos != std::string::npos) {
+        splittedString.push_back(input.substr(initialPos, pos - initialPos));
+        initialPos = pos + 1;
+        pos = input.find(ch, initialPos);
+    }
+
+    splittedString.push_back(input.substr(initialPos, std::min(pos, input.size()) - initialPos));
+
+    return splittedString;
+}
+
+std::vector<int> convertReportToNumericalReport(const std::vector<std::string>& splittedReport) {
+    std::vector<int> numericalReport;
+    for(const auto& s : splittedReport) {
+        numericalReport.push_back(std::stoi(s));
+    }
+    return numericalReport;
+}
+
+bool isReportSave(std::string report) {
+    std::vector<std::string> splittedReport = splitString(report, ' ');
+    std::vector<int> numericalReport = convertReportToNumericalReport(splittedReport);
+
+    bool isIncreasing = true;
+    bool isDecreasing = true;
+
+    for(int i=0; i<numericalReport.size()-1; i++) {
+        if(numericalReport.at(i) > numericalReport.at(i+1)) {
+            isDecreasing = false;
+        }
+
+        if(numericalReport.at(i) < numericalReport.at(i+1)) {
+            isIncreasing = false;
+        }
+
+        int differ = std::abs(numericalReport.at(i) - numericalReport.at(i+1));
+        if(differ < 1 || differ > 3) {
+            return false;
+        }
+    }
+
+    return isIncreasing || isDecreasing;
+}
+
+int calcNumberSaveReports(std::vector<std::string> reports) {
+    int saveReports = 0;
+    for(const auto& report : reports) {
+        if(isReportSave(report)) {
+            saveReports++;
+        }
+    }
+    return saveReports;
+}
+
+int main() {
+    std::string inputFile = "../input.txt";
+    std::vector<std::string> reports = readTextFromFile(inputFile);
+
+    int result = calcNumberSaveReports(reports);
+    std::cout << "There are " << result << " save reports";
+    return 0;
+}