day1

day1/1.cpp

@@ -0,0 +1,19 @@
+#include <iostream>
+#include <fstream>
+#include <algorithm>
+#include <vector>
+
+int main() {
+	std::ifstream input("./input");
+
+	size_t val = 0;
+	for(std::string line; std::getline(input, line);) {
+		std::vector<uint8_t> digits;
+		std::for_each(line.begin(), line.end(), [&digits](const char c){
+			uint8_t digit = c - '0';
+			if(digit < 10) digits.emplace_back(digit);
+		});
+		val += digits.front()*10 + digits.back();
+	}
+	std::cout << val << std::endl;
+}

day1/2.cpp

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <fstream>
+#include <regex>
+#include <algorithm>
+
+#define STRINGTONUM(test, number) \
+	if(str == test) { \
+		digit = number; \
+	} else \
+
+int main() {
+	std::ifstream input("./input");
+
+	std::regex numberRegex("(zero|one|two|three|four|five|six|seven|eight|nine|[0-9])");
+
+	size_t val = 0;
+	for(std::string line; std::getline(input, line);) {
+		std::vector<uint8_t> digits;
+		std::for_each(std::sregex_iterator(line.begin(), line.end(), numberRegex), std::sregex_iterator(), [&digits](const std::smatch &match){
+			std::string str = match.str();
+			uint8_t digit;
+			if(str.size() > 1) { // not a direct digit
+				STRINGTONUM("zero", 0)
+				STRINGTONUM("one", 1)
+				STRINGTONUM("two", 2)
+				STRINGTONUM("three", 3)
+				STRINGTONUM("four", 4)
+				STRINGTONUM("five", 5)
+				STRINGTONUM("six", 6)
+				STRINGTONUM("seven", 7)
+				STRINGTONUM("eight", 8)
+				STRINGTONUM("nine", 9) {}
+			} else {
+				digit = str[0] - '0';
+			}
+			digits.push_back(digit);
+		});
+		val += digits.front()*10 + digits.back();
+	}
+	std::cout << val << std::endl;
+}