Restructured project and updated day 3

2020/days/day4.cpp

@@ -0,0 +1,114 @@
+/*******************************************************************************
+ *
+ * Copyright (c) 2020 Gnarwhal
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files(the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *******************************************************************************/
+
+#include <vector>
+#include <string>
+#include <fstream>
+#include <iostream>
+
+#include "../misc/types.hpp"
+#include "../misc/print.hpp"
+
+struct KeyValue {
+	std::string key;
+	bool (*func)(const std::string & passport, usize index);
+};
+
+template <usize Min, usize Max>
+auto try_num(const std::string & passport, usize index) -> bool {
+	auto num = usize(0);
+	--index;
+	while (++index < passport.size() && '0' <= passport[index] && passport[index] <= '9') {
+		num = (num * 10) + passport[index] - '0';
+	}
+	return Min <= num && num <= Max;
+};
+
+auto day4() -> void {
+	auto valid_count1 = usize(0);
+	auto valid_count2 = usize(0);
+
+	auto passport = std::string();
+	auto line     = std::string();
+	auto file     = std::ifstream("inputs/day4.input");
+	while (getline(file, line)) {
+		if (line == "") {
+			auto elements = std::vector<KeyValue>{
+				{ "byr", try_num<1920, 2002> },
+				{ "iyr", try_num<2010, 2020> },
+				{ "eyr", try_num<2020, 2030> },
+				{ "hgt", [](const std::string & passport, usize index) -> bool {
+					return (try_num<150, 193>(passport, index) && passport.find("cm", index + 3) == index + 3)
+						|| (try_num<59,  76 >(passport, index) && passport.find("in", index + 2) == index + 2);
+				}},
+				{ "hcl", [](const std::string & passport, usize index) -> bool {
+					if (index < passport.size() && passport[index] == '#') {
+						auto length = usize(0);
+						auto true_index = usize(0);
+						while ((true_index = index + ++length) < passport.size() && (
+							   ('0' <= passport[true_index] && passport[true_index] <= '9')
+							|| ('a' <= passport[true_index] && passport[true_index] <= 'f')
+							|| ('A' <= passport[true_index] && passport[true_index] <= 'F')
+						));
+						return length == 7;
+					}
+					return false;
+				}},
+				{ "ecl", [](const std::string & passport, usize index) -> bool {
+					const static auto eye_colors = std::vector<std::string>{ "amb", "blu", "brn", "gry", "grn", "hzl", "oth" };
+					auto i = usize(0);
+					for (; i < eye_colors.size() && passport.find(eye_colors[i], index) != index; ++i);
+					return i < eye_colors.size();
+				}},
+				{ "pid", [](const std::string & passport, usize index) -> bool {
+					auto length     = usize(-1);
+					auto true_index = usize( 0);
+					while ((true_index = index + ++length) < passport.size()
+						&& ('0' <= passport[true_index] && passport[true_index] <= '9')
+					);
+					return length == 9;
+				}},
+			};
+			auto valid1 = true;
+			auto valid2 = true;
+			for (auto i = usize(0); i < elements.size() && valid1; ++i) {
+				auto index = usize(0);
+				valid2 =
+					(valid1 = ((index = passport.find(elements[i].key)) != std::string::npos))
+					&& valid2
+					&& elements[i].func(passport, index + elements[i].key.size() + 1);
+			}
+			valid_count1 += valid1;
+			valid_count2 += valid2;
+			passport = "";
+		} else {
+			passport += line + ' ';
+		}
+	}
+
+	print(valid_count1);
+	print(valid_count2);
+}