diff --git a/day13.c3 b/day13.c3 new file mode 100644 index 0000000..d2bc0f7 --- /dev/null +++ b/day13.c3 @@ -0,0 +1,253 @@ +module day13; +import std::io; +import std::math; +import std::array::list; + +struct PacketPair +{ + Packet* p1; + Packet* p2; +} + +define PacketList = List; + +define Packet = List; + +define PacketPairs = List; + +struct PacketElement +{ + bool is_subpacket; + union + { + Packet* packet; + int value; + } +} + +fn void Packet.print(Packet* packet) +{ + io::print("["); + foreach (i, element : packet) + { + if (i != 0) io::print(","); + if (element.is_subpacket) + { + element.packet.print(); + } + else + { + io::printf("%d", element.value); + } + } + io::print("]"); +} + +fn void PacketElement.print(PacketElement* element) +{ + if (element.is_subpacket) + { + element.packet.print(); + } + else + { + io::printf("%d", element.value); + } +} + +fn int parse_list(void* list1, char[] list_inner) +{ + Packet* packet = list1; + int index = 0; + int len = list_inner.len; + while (index < len) + { + int start = index; + char c = list_inner[index]; + if (c >= '0' && c <= '9') + { + index++; + while (index < len) + { + c = list_inner[index]; + if (c < '0' || c > '9') break; + index++; + } + PacketElement* element = mem::alloc(PacketElement); + *element = { .is_subpacket = false, .value = str::to_int(list_inner[start..(index - 1)])!! }; + packet.append(element); + if (index == len) return len; + if (c == ']') return index + 1; + assert(c == ','); + index++; + continue; + } + if (c == ']') return index + 1; + assert(c == '['); + index++; + PacketElement* element = mem::alloc(PacketElement); + Packet* inner_list = mem::alloc(Packet); + inner_list.init(); + index += parse_list(inner_list, list_inner[index..]); + *element = { .is_subpacket = true, .packet = inner_list }; + packet.append(element); + if (index == len) return len; + c = list_inner[index]; + if (c == ']') return index + 1; + assert(c == ','); + index++; + } + unreachable(); +} + +fn Packet* packet_from_line(char[] line) +{ + assert(line[0] == '[' && line[^1] == ']'); + Packet* packet = mem::alloc(Packet); + packet.init(); + parse_list(packet, line[1..]); + return packet; +} +fn PacketPairs* load_packets() +{ + File f; + f.open("packets.txt", "rb")!!; + defer catch(f.close()); + PacketPairs* packet = mem::alloc(PacketPairs); + packet.init(); + while (!f.eof()) + { + @pool() + { + Packet* first = packet_from_line(f.tgetline()); + Packet* second = packet_from_line(f.tgetline()); + packet.append({ first, second }); + if (!f.eof()) f.tgetline(); + }; + } + return packet; +} + +fn int PacketElement.compare(PacketElement* e1, PacketElement* e2) +{ + if (e1.is_subpacket && e2.is_subpacket) + { + return e1.packet.compare_to(e2.packet); + } + if (e1.is_subpacket) + { + Packet* packet = e1.packet; + if (!packet.len()) return 1; + switch (packet.get(0).compare(e2)) + { + case -1: return -1; + case 0: return packet.len() > 1 ? -1 : 0; + case 1: return 1; + } + } + if (e2.is_subpacket) + { + Packet* packet = e2.packet; + if (!packet.len()) return -1; + switch (e1.compare(packet.get(0))) + { + case -1: return -1; + case 0: return packet.len() > 1 ? 1 : 0; + case 1: return 1; + } + } + if (e1.value == e2.value) return 0; + return e1.value <= e2.value ? 1 : -1; +} + +fn int Packet.compare_to(Packet* list1, Packet* list2) +{ + foreach (i, PacketElement* e1 : list1) + { + if (i >= list2.len()) + { + return -1; + } + switch (int x = e1.compare(list2.get(i))) + { + case 0: + continue; + default: + return x; + } + } + return list2.len() > list1.len() ? 1 : 0; +} + +fn void part1(PacketPairs* packets) +{ + int sum = 0; + foreach (int i, PacketPair pair : packets) + { + if (pair.p1.compare_to(pair.p2) >= 0) + { + sum += i + 1; + } + } + io::printfln("Sum of ordered pairs: %d", sum); +} + + +fn void insert_packet(PacketList* list, Packet* new_packet) +{ + foreach (i, packet : list) + { + if (new_packet.compare_to(packet) > 0) + { + list.insert_at(i, new_packet); + return; + } + } + list.append(new_packet); +} + +fn Packet* create_div(int value) +{ + Packet* packet = mem::alloc(Packet); + packet.init(); + PacketElement* element = mem::alloc(PacketElement); + Packet* inner_packet = mem::alloc(Packet); + *element = { .is_subpacket = true, .packet = inner_packet }; + inner_packet.init(); + PacketElement* element_inner = mem::alloc(PacketElement); + *element_inner = { .value = value }; + inner_packet.append(element_inner); + packet.append(element); + return packet; +} +fn void part2(PacketPairs* packets) +{ + PacketList queue; + queue.init(); + foreach NEXT: (pair : *packets) + { + insert_packet(&queue, pair.p1); + insert_packet(&queue, pair.p2); + } + Packet* div2 = create_div(2); + Packet* div6 = create_div(6); + insert_packet(&queue, div2); + insert_packet(&queue, div6); + int key = 1; + foreach (int i, packet : queue) + { + switch (packet) + { + case div2: + case div6: + key *= i + 1; + } + } + io::printfln("Decoder key: %d", key); +} +fn void main() +{ + PacketPairs* packets = load_packets(); + part1(packets); + part2(packets); +} \ No newline at end of file diff --git a/packets.txt b/packets.txt new file mode 100644 index 0000000..3c7510f --- /dev/null +++ b/packets.txt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