Day 8 attempt 1 is proof that I should get some sleep. I totally forgot about a couple things and this is hack-n-slashed together nonsense.

2022/8/Makefile

@@ -0,0 +1,2 @@
+a.out: main.cpp
+	clang++ -std=c++2b -g -O0 main.cpp

2022/8/data.txt

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2022/8/main.cpp

@@ -0,0 +1,163 @@
+#include <fstream>
+#include <iostream>
+#include <set>
+#include <string>
+#include <vector>
+
+int main()
+{
+	std::ifstream ifs("data.txt");
+	if(!ifs.is_open())
+	{
+		std::cerr << "Missing data.txt." << std::endl;
+		return -1;
+	}
+
+	unsigned long total = 0;
+	unsigned long total_pt2 = 0;
+
+	std::vector<std::vector<int>> trees;
+
+	// Parse:
+	for(std::string line; std::getline(ifs, line); )
+	{
+		if(line == "")
+			continue;
+
+		trees.push_back({});
+		for(const char &ch : line)
+			trees.back().push_back(ch - '0');
+	}
+
+	total += 2 * trees.size();
+	total += 2 * (trees[0].size() - 2);
+
+	std::set<std::pair<int, int>> visible_coordinates;
+
+	// NOTE(dev):
+#warning This shit is wrong because it's only finding the FIRST visible tree, not all visible trees.
+#warning e.g. If you have 2003005003007004005
+#warning                  ^  ^  ^     ^  are all visible from the left
+#warning                                    ^ is visible from the right
+
+	// left to right, right to left IN EACH ROW:
+	for(auto y = 1; y < trees.size() - 1; ++y)
+	{
+		auto x = 1;
+		bool found_from_left = false;
+		while(x < trees[y].size() - 1)
+		{
+			std::cout << trees[y][x];
+			if(trees[y][x] < trees[y][x-1])
+				break;
+			found_from_left = true;
+			++x;
+		}
+		if(found_from_left)
+		{
+			// make sure it isn't the right-most, as that's already counted
+			if(x == trees[y].size() - 1)
+			{
+				if(trees[y][x] < trees[y][x-1])
+				{
+					std::cout << ": insert {" << (x - 1) << "," << y << "}"
+					          << "(" << trees[y][x-1] << ")";
+					visible_coordinates.insert({x - 1, y});
+				}
+			}
+			else
+			{
+				std::cout << ": insert {" << (x - 1) << "," << y << "}"
+				          << "(" << trees[y][x-1] << ")";
+				visible_coordinates.insert({x - 1, y});
+
+				// NOTE(dev): Only search from the right if there's still room to search:
+				bool found_from_right = false;
+				auto found_x = x - 1;
+				x = trees[y].size() - 2;
+				while(x > found_x)
+				{
+					if(trees[y][x] < trees[y][x + 1])
+						break;
+					found_from_right = true;
+					--x;
+				}
+				if(found_from_right)
+				{
+					std::cout << ": insert {" << (x + 1) << "," << y << "}"
+					          << "(" << trees[y][x+1] << ")";
+					visible_coordinates.insert({x + 1, y});
+				}
+			}
+		}
+		std::cout << std::endl;
+	}
+
+	// top to bottom, bottom to top IN EACH COLUMN:
+	for(auto x = 1; x < trees[0].size() - 1; ++x)
+	{
+		auto y = 1;
+		bool found_from_top = false;
+		while(y < trees.size() - 1)
+		{
+			if(trees[y][x] < trees[y-1][x])
+				break;
+			found_from_top = true;
+			++x;
+		}
+		if(found_from_top)
+		{
+			// make sure it isn't the bottom-most, as that's already counted
+			if(y == trees.size() - 1)
+			{
+				if(trees[y][x] < trees[y-1][x])
+				{
+					std::cout << ": insert {" << x << "," << (y - 1) << "}"
+					          << "(" << trees[y-1][x] << ")";
+					visible_coordinates.insert({x, y - 1});
+				}
+			}
+			else
+			{
+					std::cout << ": insert {" << x << "," << (y - 1) << "}"
+					          << "(" << trees[y-1][x] << ")";
+				visible_coordinates.insert({x, y - 1});
+
+				// NOTE(dev): Only search from the bottom if there's still room to search:
+				bool found_from_bottom = false;
+				auto found_y = y - 1;
+				y = trees.size() - 2;
+				while(y > found_y)
+				{
+					if(trees[y][x] < trees[y + 1][x])
+						break;
+					found_from_bottom = true;
+					--y;
+				}
+				if(found_from_bottom)
+				{
+					std::cout << ": insert {" << x << "," << (y + 1) << "}"
+					          << "(" << trees[y+1][x] << ")";
+					visible_coordinates.insert({x, y + 1});
+				}
+			}
+		}
+	}
+
+	total += visible_coordinates.size();
+
+	// // track interior
+	// for(auto y = 1; y < trees.size() - 1; ++y)
+	// {
+	// 	// left & right, first
+	// 	for(auto x = 1; x < trees[y].size() - 1; ++x)
+	// 	{
+
+	// 	}
+	// }
+
+	std::cout << "    Total: " <<     total << std::endl;
+	std::cout << "PT2 Total: " << total_pt2 << std::endl;
+
+	return 0;
+}