86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
#include <iterator>
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#include <iostream>
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#include <utility>
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#include <tuple>
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#include <map>
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#include <deque>
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#include <vector>
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#include <intcode.hpp>
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using namespace intcode;
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namespace {
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using Coord = std::pair<ValueType, ValueType>;
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auto Compute(Machine machine) -> std::pair<int,int> {
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Coord here {0,0};
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std::map<Coord, ValueType> world {{{0,0},1}};
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using State = std::tuple<Coord, Machine>;
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std::vector<State> layer {{{0,0}, std::move(machine)}};
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std::vector<State> next_layer;
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auto action = [&](Machine m, ValueType cmd, Coord coord) {
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if (!world.contains(coord)) {
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std::get<Input>(Step(m)).pos = cmd;
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auto o = std::get<Output>(Step(m)).val;
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world[coord] = o;
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if (o) {
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next_layer.emplace_back(coord, std::move(m));
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}
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}
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};
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int part1 = 0;
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while (!layer.empty()) {
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for (auto && s : layer) {
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auto& [loc, m] = s;
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if (2 == world[loc]) {
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world.clear();
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world[loc] = 2;
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auto start = std::move(m);
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layer.clear();
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layer.push_back({loc, std::move(start)});
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goto loop2;
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}
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auto [x,y] = loc;
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action(m, 1, {x,y-1});
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action(m, 2, {x,y+1});
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action(m, 3, {x-1,y});
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action(std::move(m), 4, {x+1,y});
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}
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layer = std::move(next_layer);
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next_layer.clear();
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part1++;
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}
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loop2:
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int part2 = 0;
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while (!layer.empty()) {
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for (auto && s : layer) {
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auto& [loc, m] = s;
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auto [x,y] = loc;
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action(m, 1, {x,y-1});
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action(m, 2, {x,y+1});
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action(m, 3, {x-1,y});
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action(std::move(m), 4, {x+1,y});
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}
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layer = std::move(next_layer);
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next_layer.clear();
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part2++;
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}
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return {part1, part2-1};
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}
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} // namespace
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auto main() -> int {
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auto machine = Machine{ParseStream(std::cin)};
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auto [part1, part2] = Compute(machine);
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std::cout << "Part 1: " << part1 << std::endl;
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std::cout << "Part 2: " << part2 << std::endl;
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}
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