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#include <fstream>
#include <iostream>
#include <map>
#include <sstream>
#include <string>
#include <tuple>
using namespace std;
using Sink = tuple<string, int>;
vector<string>
split(const string& line, char sep)
{
vector<string> parts;
stringstream input{ line };
for ( string part; getline(input, part, sep); ) {
parts.emplace_back(part);
}
return parts;
}
map<int, tuple<Sink, Sink, vector<int>>>
read_file(string_view filename)
{
fstream input{ filename };
map<int, tuple<Sink, Sink, vector<int>>> bots;
for ( string line; getline(input, line); ) {
const auto parts = split(line, ' ');
if ( parts.at(0) == "bot" ) {
const Sink low_sink = { parts.at(5), stoi(parts.at(6)) };
const Sink hi_sink = { parts.at(10), stoi(parts.at(11)) };
auto& bot = bots[stoi(parts.at(1))];
get<0>(bot) = low_sink;
get<1>(bot) = hi_sink;
}
else if ( parts.at(0) == "value" ) {
auto& bot = bots[stoi(parts.at(5))];
get<2>(bot).push_back(stoi(parts.at(1)));
}
}
return bots;
}
void
solve(map<int, tuple<Sink, Sink, vector<int>>> bots)
{
map<int, int> outputs;
const auto store = [&](const Sink& sink, int value) {
if ( get<0>(sink) == "bot" ) {
auto& to_bot = bots[get<1>(sink)];
get<2>(to_bot).push_back(value);
}
else {
outputs[get<1>(sink)] = value;
}
};
while ( true ) {
auto it = ranges::find_if(bots, [](auto& bot) {
const auto& [id, values] = bot;
return (get<2>(values).size() == 2);
});
if ( it == bots.end() ) {
break;
}
auto& [id, values] = *it;
auto& [low_sink, hi_sink, chips] = values;
ranges::sort(chips);
store(low_sink, chips.at(0));
store(hi_sink, chips.at(1));
// part1
if ( chips.at(0) == 17 && chips.at(1) == 61 ) {
cout << id << endl;
}
chips.clear();
}
// part2
cout << outputs[0] * outputs[1] * outputs[2] << endl;
}
int
main()
{
auto bots = read_file("data/day10.txt");
solve(bots);
}
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