Restructured project and updated day 3

2020/days/day3.cpp

@@ -0,0 +1,81 @@
+/*******************************************************************************
+ *
+ * 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 <iostream>
+#include <fstream>
+
+#include "../misc/types.hpp"
+#include "../misc/print.hpp"
+
+struct TreeVector{ usize horz;    usize vert;    };
+struct Coordinate{ usize x_index; usize y_index; };
+
+auto read_field_and_count_trees(const std::vector<TreeVector> & vectors) -> std::vector<u64> {
+	auto tree_counts = std::vector<u64>(vectors.size());
+	auto coords      = std::vector<Coordinate>(vectors.size());
+	for (auto i = usize(0); i < coords.size(); ++i) {
+		coords[i] = { usize(-vectors[i].horz), usize(-1) };
+	}
+
+	auto line = std::string();
+	auto file = std::ifstream("inputs/day3.input");
+
+	while (getline(file, line)) {
+		for (auto i = usize(0); i < vectors.size(); ++i) {
+			auto & vector = vectors[i];
+			auto & coord  = coords[i];
+			
+			auto vertical_check = (++coord.y_index % vector.vert == 0);
+			tree_counts[i] += vertical_check * (line[(coord.x_index += (vertical_check * vector.horz)) % line.size()] == '#');
+		}
+	}
+
+	return std::move(tree_counts);
+}
+
+auto day3() -> void {
+	auto trees       = std::vector<std::string>();
+	auto tree_counts = read_field_and_count_trees(
+		std::vector<TreeVector>{
+			{ 3, 1 },
+			{ 1, 1 },
+			{ 5, 1 },
+			{ 7, 1 },
+			{ 1, 2 },
+		}
+	);
+
+	print(tree_counts[0]);
+
+	auto tree_count_product = u64(1);
+	for (auto tree_count : tree_counts) {
+		tree_count_product *= tree_count;
+	}
+
+	print(tree_count_product);
+}