2021 - Day 1

2021/1/1/main.cpp

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+#include <iostream>
+#include <fstream>
+
+int main() {
+	std::fstream input("1/input", std::ios::in);
+
+	std::string line;
+	std::getline(input, line);
+	int prev = std::stoi(line);
+
+	int increases = 0;
+	while (std::getline(input, line)) {
+		int next = std::stoi(line);
+
+		if (next > prev) {
+			increases++;
+		}
+
+		prev = next;
+	}
+
+	std::cout << "Increases: " << increases << '\n';
+}

2021/1/2/main.cpp

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+#include <iostream>
+#include <fstream>
+#include <array>
+
+int main() {
+	std::fstream input("2/input", std::ios::in);
+
+	std::array<int, 3> a;
+
+	std::string line;
+	int prev = 0;
+	int increases = 0;
+	for (int i = 0; std::getline(input, line); ++i) {
+		std::array<int, 3> temp = a;
+		a[0] = std::stoi(line);
+		a[1] = temp[0];
+		a[2] = temp[1];
+
+		int sum = a[0] + a[1] + a[2];
+
+		if (i >= 3 && sum > prev) {
+			increases++;
+		}
+
+		prev = sum;
+	}
+
+	std::cout << "Increases: " << increases << '\n';
+}

2021/1/build.sh

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+#!/bin/bash
+mkdir -p build
+g++ -Wall -Wextra -Og -g 1/main.cpp -std=c++20 -o build/challenge1
+g++ -Wall -Wextra -Og -g 2/main.cpp -std=c++20 -o build/challenge2