AoC2025/day6a.cpp at main · RRR784/AoC2025 · GitHub

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#include <string>
#include <vector>
#include <sstream>
#include <fstream>
#include <cassert>
#include <algorithm>
#include <array>

namespace day6a
{
	int main()
	{
		std::string input0;
		//std::ifstream ifile("day6_sample.txt");
		std::ifstream ifile("day6.txt");
		if (ifile.is_open())
		{
			while (!ifile.eof())
			{
				std::string line;
				std::getline(ifile, line);
				input0 += line + '\n';
			}
			assert(input0.back() == '\n');
			input0.pop_back(); // no trailing newline character please
			//__debugbreak();
		}
		else
		{
			assert(0);
		}

		std::vector<std::string> values;
		std::string temp;
		for (char c : input0)
		{
			if (c == '\n')
			{
				values.push_back(temp);
				temp = "";
				continue;
			}
			temp += c;
		}
		values.push_back(temp);

		int h = values.size();
		int w = values[0].size();
		for (auto& row : values)
		{
			assert(row.size() == w);
		}

		for (int x = 0; x < w; x++)
		{
			char c = values[0][x];
			if (c == ' ')
			{
				bool is_column = true;
				for (int y = 1; y < h; y++)
				{
					char c2 = values[y][x];
					if (c2 != ' ')
					{
						is_column = false;
						break;
					}
				}
				if (is_column)
				{
					for (int y = 0; y < h; y++)
					{
						values[y][x] = '|';
					}
				}
			}
		}

		auto str_to_nums = [](std::string s)->std::vector<uint64_t> {
			std::vector<uint64_t> result;
			std::istringstream ss{ s };
			while (true)
			{
				uint64_t v1;
				char c1;
				if (!ss.eof())
				{
					ss >> v1;
					result.push_back(v1);
				}
				if (!ss.eof())
				{
					ss >> c1;
				}
				else
				{
					break;
				}
			}
			return result;
		};
		auto str_to_oprs = [](std::string s)->std::vector<char> {
			std::vector<char> result;
			std::istringstream ss{ s };
			while (true)
			{
				char v1;
				char c1;
				if (!ss.eof())
				{
					ss >> v1;
					result.push_back(v1);
				}
				if (!ss.eof())
				{
					ss >> c1;
				}
				else
				{
					break;
				}
			}
			return result;
		};

		constexpr int nums_size = 4; // dummy, dont forget to update this value when switching from sample to actual input
		std::array<std::vector<uint64_t>, nums_size> nums;
		for (int i = 0; i < nums_size; i++)
		{
			nums[i] = str_to_nums(values[i]);
		}
		std::vector<char> oprs = str_to_oprs(values.back());

		uint64_t grand_total = 0;
		for (int i = 0; i < oprs.size(); i++)
		{
			uint64_t rollover_temp = grand_total;
			char op = oprs[i];
			uint64_t num_temp = 0;
			switch (op)
			{
			case '+':
				num_temp = 0;
				for (int v = 0; v < nums_size; v++)
				{
					num_temp += nums[v][i];
				}
				grand_total += num_temp;
				break;
			case '*':
				num_temp = 1;
				for (int v = 0; v < nums_size; v++)
				{
					num_temp *= nums[v][i];
				}
				grand_total += num_temp;
				break;
			}
			assert(grand_total >= rollover_temp);
		}

		__debugbreak();
		return 0;
	}

}