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Corvus they/them :!marseycorvus: Stark Raven Mad :marseycorvus:  2yr ago (text post) 601 thread views #128909

Advent of Code Day 5, AKA Stacks 101 :marseyinabox:

I actually stayed up to get a semi-decent score for once (being a eurocel for this is suffering). How are you all faring with shifting boxes around?

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constexpr int stack_count{ 9 };


template<std::size_t SIZE>
void reverseStacks(std::array<std::stack<char>, SIZE>& stacks) {
	for (std::size_t i{ 0 }; i < stacks.size(); ++i) {
		std::stack<char> temp;

		while (!stacks[i].empty()) {
			temp.push(stacks[i].top());
			stacks[i].pop();
		}

		stacks[i].swap(temp);

	}
}

template<std::size_t SIZE>
void movePartOne(int count, int from, int to, std::array<std::stack<char>, SIZE>& stacks) {

	for (int i{ 0 }; i < count; ++i) {
		char temp = stacks[from - 1].top();
		stacks[from - 1].pop();
		stacks[to - 1].push(temp);
	}
}


template<std::size_t SIZE>
void movePartTwo(int count, int from, int to, std::array<std::stack<char>, SIZE>& stacks) {

	std::stack<char> temp;
	for (int i{ 0 }; i < count; ++i) {
		temp.push(stacks[from - 1].top());
		stacks[from - 1].pop();
	}

	while (!temp.empty()) {
		stacks[to - 1].push(temp.top());
		temp.pop();
	}
}


std::string solution(void (*moveCall)(int, int, int, std::array<std::stack<char>, stack_count>&)) {
	std::array<std::stack<char>, stack_count> crate_stacks;


	std::ifstream file("input.txt");

	std::string buf;

	while (std::getline(file, buf)) {
		if (buf[1] == '1') break;

		for (int i{ 0 }; i < stack_count; ++i) {
			char c = buf[4 * i + 1];
			if (c != ' ') {
				crate_stacks[i].push(c);
			}
		}
	}
	reverseStacks(crate_stacks);
	std::getline(file, buf);
	while (std::getline(file, buf)) {
		int count, from, to;
		std::string temp;
		std::istringstream iss(buf);
		iss >> temp >> count >> temp >> from >> temp >> to;
		moveCall(count, from, to, crate_stacks);
	}

	std::string out;

	for (std::size_t i{ 0 }; i < crate_stacks.size(); ++i) {
		out += crate_stacks[i].top();
	}
	return out;
}



int main() {
	std::string p1 = solution(movePartOne);
	std::string p2 = solution(movePartTwo);
	std::cout << "Part One: " << p1 << '\n'
		<< "Part Two: " << p2 << '\n';
}

Spent way to long on my decision to actually use real stacks, and couldn't figure out how to pass template<std::size_t SIZE> void movePartOne(int count, int from, int to, std::array<std::stack<char>, SIZE>& stacks) { as an argument to the solution-function, without hardcoding SIZE in solution, tbf not quite sure why i even wanted to use std::array now.

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Impressive. Normally people with such severe developmental disabilities struggle to write much more than a sentence or two. He really has exceded our expectations for the writing portion. Sadly the coherency of his writing, along with his abilities in the social skills and reading portions, are far behind his peers with similar disabilities.

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LPB is just WRECKING people on these challenges (including me).

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:marseypearlclutch2:

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