92 lines
2.4 KiB
C++
92 lines
2.4 KiB
C++
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// AOC - 2022 - 05
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#include "answer.hpp"
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#include <algorithm>
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#include <fstream>
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#include <iostream>
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#include <sstream>
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#define STACK_WIDTH 4
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stacks_t get_stacks(std::vector<std::string> stack_lines, uint n_stacks) {
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// reverse so that stack_lines[0] is the bottom of the stacks
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std::reverse(stack_lines.begin(), stack_lines.end());
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std::vector<std::vector<char>> stacks(n_stacks);
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uint max_height = stack_lines.size();
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for (uint h = 0; h < max_height; h++) {
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for (uint i = 0; i < n_stacks; i++) {
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char item = stack_lines[h][i * STACK_WIDTH + 1];
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if (item != ' ')
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stacks[i].push_back(item);
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}
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}
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return stacks;
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}
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Move get_move(std::string line) {
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std::stringstream ss(line);
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std::string _;
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uint item, from, to;
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ss >> _; // move
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ss >> item;
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ss >> _; // from
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ss >> from;
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ss >> _; // to
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ss >> to;
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return {--item, --from, --to};
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}
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Input get_input(const char * filename) {
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std::ifstream stream(filename);
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std::string str;
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Input ret;
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std::vector<std::string> stack_lines;
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stacks_t stacks;
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while (getline(stream, str) && !std::isdigit(str[1])) {
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stack_lines.push_back(str);
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}
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std::reverse(str.begin(), str.end() - 1);
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std::stringstream ss(str);
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uint n_stacks;
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ss >> n_stacks;
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stacks = get_stacks(stack_lines, n_stacks);
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getline(stream, str); // get rid of the empty line between the stacks and
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// the move instructions
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std::vector<Move> moves;
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while (getline(stream, str))
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moves.push_back(get_move(str));
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return {stacks, moves};
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}
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template <class T> std::vector<T> pop(std::vector<T> & v, uint i) {
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std::vector<T> ret(v.begin() + i, v.end());
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v.erase(v.begin() + i, v.end());
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return ret;
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}
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std::string get_result(Input input) {
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std::string ret;
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stacks_t stacks = input.stacks;
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std::cout << stacks << std::endl;
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for (auto & move : input.moves) {
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std::cout << move << std::endl;
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std::vector<char> tbi = pop(stacks[move.from], stacks[move.from].size() - 1 - move.item);
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#if PART == 1
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std::reverse(tbi.begin(), tbi.end());
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#endif
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stacks[move.to].insert(stacks[move.to].end(),
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tbi.begin(), tbi.end());
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std::cout << stacks << std::endl << std::endl;
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}
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for (auto & stack : stacks)
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ret += stack.back();
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return ret;
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}
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