Solve day 5 part 1

day_5.cpp

@@ -0,0 +1,44 @@
+#include <fstream>
+#include <iostream>
+#include <vector>
+
+struct range
+{
+	long int min;
+	long int max;
+};
+
+int main()
+{
+	std::ifstream file("input.txt");
+
+	std::vector<range> fresh_ranges;
+
+	std::string line;
+	while (getline(file, line)) {
+		if (line == "") break;
+
+		range range;
+		sscanf(line.c_str(), "%ld-%ld", &range.min, &range.max);
+
+		fresh_ranges.push_back(range);
+	}
+
+	int fresh_amount = 0;
+
+	while (getline(file, line)) {
+		long int id = std::stol(line);
+		bool is_fresh = false;
+
+		for (range range : fresh_ranges) {
+			if (id >= range.min && id <= range.max) {
+				is_fresh = true;
+				break;
+			}
+		}
+
+		if (is_fresh) fresh_amount++;
+	}
+
+	std::cout << fresh_amount << std::endl;
+}