2020-01
This commit is contained in:
Eric Mertens
parent
8f772d85b2
commit
c6879b4359
156
2017/18.cpp
156
2017/18.cpp
@ -3,6 +3,7 @@
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#include <cstdint>
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#include <deque>
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#include <iostream>
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#include <sstream>
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#include <iterator>
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#include <map>
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#include <optional>
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@ -16,6 +17,7 @@
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namespace {
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using Name = std::string;
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using Value = std::int64_t;
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@ -23,6 +25,10 @@ struct Literal { Value value; };
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struct Variable { Name name; };
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using Expression = std::variant<Literal, Variable>;
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struct Send { Value sent; };
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struct Receive { Value & target; };
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using Effect = std::variant<Send, Receive>;
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struct Set { Name x; Expression y; };
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struct Add { Name x; Expression y; };
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struct Mul { Name x; Expression y; };
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@ -32,6 +38,11 @@ struct Rcv { Name x; };
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struct Snd { Expression x; };
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using Instruction = std::variant<Set, Add, Mul, Mod, Jgz, Rcv, Snd>;
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struct State {
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std::map<Name, Value> registers;
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std::size_t pc;
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};
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auto IsName(std::string const& word) {
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return std::all_of(word.begin(), word.end(), [](auto c) { return std::isalpha(c); });
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}
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@ -92,113 +103,140 @@ auto Parse(std::istream & in) -> std::vector<Instruction> {
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return result;
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}
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struct Send { Value sent; };
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struct Receive { Value & target; };
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struct Halt {};
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using Effect = std::variant<Send, Receive, Halt>;
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auto Eval(State const& state, Expression expression) -> Value {
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return std::visit(overloaded{
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[](Literal l) -> Value { return l.value; },
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[&](Variable v) -> Value {
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if (auto it = state.registers.find(v.name); it != state.registers.end()) {
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return it->second;
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} else {
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return 0; }
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},
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}, expression);
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}
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struct Machine {
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std::vector<Instruction> const& program_;
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std::map<Name, Value> registers_;
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std::size_t pc_;
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auto Step(State & state, Instruction const& instruction) -> std::optional<Effect> {
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using R = std::optional<Effect>;
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return std::visit(overloaded{
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[&](Set instruction) -> R { state.registers[instruction.x] = Eval(state, instruction.y); state.pc++; return {}; },
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[&](Add instruction) -> R { state.registers[instruction.x] += Eval(state, instruction.y); state.pc++; return {}; },
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[&](Mul instruction) -> R { state.registers[instruction.x] *= Eval(state, instruction.y); state.pc++; return {}; },
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[&](Mod instruction) -> R { state.registers[instruction.x] %= Eval(state, instruction.y); state.pc++; return {}; },
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[&](Jgz instruction) -> R { state.pc += Eval(state, instruction.x) > 0 ? Eval(state, instruction.y) : 1; return {}; },
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[&](Snd instruction) -> R { state.pc++; return Send{Eval(state, instruction.x)}; },
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[&](Rcv instruction) -> R { state.pc++; return Receive{state.registers[instruction.x]}; },
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},
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instruction);
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}
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public:
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Machine(std::vector<Instruction> const& program)
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: program_{program}, registers_{}, pc_{}
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{}
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auto Eval(Expression expression) -> Value {
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return std::visit(overloaded{
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[](Literal l) { return l.value; },
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[&](Variable v) { return registers_[v.name]; },
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}, expression);
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}
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auto Step() -> Effect {
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while (pc_ < program_.size()) {
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if (auto effect = std::visit(overloaded{
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[&](Set instruction) -> std::optional<Effect> { registers_[instruction.x] = Eval(instruction.y); pc_++; return {}; },
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[&](Add instruction) -> std::optional<Effect> { registers_[instruction.x] += Eval(instruction.y); pc_++; return {}; },
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[&](Mul instruction) -> std::optional<Effect> { registers_[instruction.x] *= Eval(instruction.y); pc_++; return {}; },
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[&](Mod instruction) -> std::optional<Effect> { registers_[instruction.x] %= Eval(instruction.y); pc_++; return {}; },
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[&](Jgz instruction) -> std::optional<Effect> { pc_ += Eval(instruction.x) > 0 ? Eval(instruction.y) : 1; return {}; },
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[&](Snd instruction) -> std::optional<Effect> { pc_++; return Send{Eval(instruction.x)}; },
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[&](Rcv instruction) -> std::optional<Effect> { pc_++; return Receive{registers_[instruction.x]}; },
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},
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program_[pc_]))
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{
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return *effect;
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}
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auto BigStep(State & state, std::vector<Instruction> const& program) -> Effect {
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while(state.pc < program.size()) {
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if (auto effect = Step(state, program[state.pc])) {
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return *effect;
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}
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return Halt{};
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}
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};
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throw std::runtime_error{"program crash"};
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}
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auto Part1(std::vector<Instruction> const& program) -> Value {
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Value last_sound = -1;
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Machine m { program };
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State state {};
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for(;;) {
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auto effect = m.Step();
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for (;;) {
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auto effect = BigStep(state, program);
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switch (effect.index()) {
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case 0: last_sound = std::get<0>(effect).sent; break;
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case 1: if (std::get<1>(effect).target > 0) { return last_sound; } break;
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default: throw std::runtime_error{"program halted"};
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}
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}
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throw std::runtime_error{"part 1 failed"};
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}
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auto Spin(Machine & m, std::deque<Value> & input, std::deque<Value> & output) -> Value* {
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auto Spin(
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State & state,
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std::vector<Instruction> const& program,
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std::deque<Value> & input,
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std::deque<Value> & output
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) -> std::pair<Value*, std::size_t>
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{
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std::size_t n = 0;
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for(;;) {
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auto effect = m.Step();
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auto effect = BigStep(state, program);
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switch (effect.index()) {
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case 0: output.push_back(std::get<0>(effect).sent); break;
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case 0:
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output.push_back(std::get<0>(effect).sent);
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n++;
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break;
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case 1: {
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auto & target = std::get<1>(effect).target;
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if (input.empty()) {
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return ⌖
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return {&target, n};
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} else {
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target = input.front();
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input.pop_front();
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}
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break;
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}
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default: throw std::runtime_error{"program halted"};
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}
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}
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}
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auto Part2(std::vector<Instruction> const& program) -> std::size_t {
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Machine m0 { program };
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Machine m1 { program };
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m1.registers_["p"] = 1;
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State m0{};
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State m1{{{"p",1}}};
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std::deque<Value> inputs0;
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std::deque<Value> inputs1;
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auto stuck0 = Spin(m0, inputs0, inputs1);
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auto stuck1 = Spin(m1, inputs1, inputs0);
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std::size_t result = inputs0.size();
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auto [stuck0, _] = Spin(m0, program, inputs0, inputs1);
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auto [stuck1, n] = Spin(m1, program, inputs1, inputs0);
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while(!(inputs0.empty() && inputs1.empty())) {
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if (!inputs0.empty()) {
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*stuck0 = inputs0.front(); inputs0.pop_front();
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stuck0 = Spin(m0, inputs0, inputs1);
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stuck0 = Spin(m0, program, inputs0, inputs1).first;
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}
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if (!inputs1.empty()) {
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*stuck1 = inputs1.front(); inputs1.pop_front();
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result -= inputs0.size();
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stuck1 = Spin(m1, inputs1, inputs0);
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result += inputs0.size();
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auto res = Spin(m1, program, inputs1, inputs0);
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stuck1 = res.first;
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n += res.second;
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}
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}
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return result;
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return n;
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}
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} // namespace
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TEST_SUITE("documented examples") {
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TEST_CASE("part 1") {
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std::istringstream in {
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"set a 1\n"
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"add a 2\n"
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"mul a a\n"
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"mod a 5\n"
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"snd a\n"
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"set a 0\n"
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"rcv a\n"
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"jgz a -1\n"
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"set a 1\n"
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"jgz a -2\n"};
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REQUIRE(Part1(Parse(in)) == 4);
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}
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TEST_CASE("part 2") {
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std::istringstream in {
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"snd 1\n"
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"snd 2\n"
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"snd p\n"
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"rcv a\n"
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"rcv b\n"
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"rcv c\n"
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"rcv d\n"};
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REQUIRE(Part2(Parse(in)) == 3);
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}
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}
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auto main(int argc, char** argv) -> int {
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auto program = Parse(aocpp::Startup(argc, argv));
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std::cout << "Part 1: " << Part1(program) << std::endl;
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@ -1,74 +1,74 @@
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add_executable(01 01.cpp)
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target_link_libraries(01 aocpp)
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add_executable(2019_01 01.cpp)
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target_link_libraries(2019_01 aocpp)
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add_executable(02 02.cpp)
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target_link_libraries(02 aocpp intcode)
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add_executable(2019_02 02.cpp)
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target_link_libraries(2019_02 aocpp intcode)
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add_executable(03 03.cpp)
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target_link_libraries(03 aocpp)
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add_executable(2019_03 03.cpp)
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target_link_libraries(2019_03 aocpp)
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add_executable(04 04.cpp)
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target_link_libraries(04 aocpp)
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add_executable(2019_04 04.cpp)
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target_link_libraries(2019_04 aocpp)
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add_executable(05 05.cpp)
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target_link_libraries(05 aocpp intcode)
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add_executable(2019_05 05.cpp)
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target_link_libraries(2019_05 aocpp intcode)
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add_executable(06 06.cpp)
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target_link_libraries(06 aocpp)
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add_executable(2019_06 06.cpp)
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target_link_libraries(2019_06 aocpp)
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add_executable(07 07.cpp)
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target_link_libraries(07 aocpp intcode)
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add_executable(2019_07 07.cpp)
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target_link_libraries(2019_07 aocpp intcode)
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add_executable(08 08.cpp)
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target_link_libraries(08 aocpp)
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add_executable(2019_08 08.cpp)
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target_link_libraries(2019_08 aocpp)
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add_executable(09 09.cpp)
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target_link_libraries(09 aocpp intcode)
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add_executable(2019_09 09.cpp)
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target_link_libraries(2019_09 aocpp intcode)
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add_executable(10 10.cpp)
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target_link_libraries(10 aocpp)
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add_executable(2019_10 10.cpp)
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target_link_libraries(2019_10 aocpp)
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add_executable(11 11.cpp)
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target_link_libraries(11 aocpp intcode)
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add_executable(2019_11 11.cpp)
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target_link_libraries(2019_11 aocpp intcode)
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add_executable(12 12.cpp)
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target_link_libraries(12 aocpp)
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add_executable(2019_12 12.cpp)
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target_link_libraries(2019_12 aocpp)
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add_executable(13 13.cpp)
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target_link_libraries(13 aocpp intcode)
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add_executable(2019_13 13.cpp)
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target_link_libraries(2019_13 aocpp intcode)
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add_executable(14 14.cpp)
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target_link_libraries(14 aocpp)
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add_executable(2019_14 14.cpp)
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target_link_libraries(2019_14 aocpp)
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add_executable(15 15.cpp)
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target_link_libraries(15 aocpp intcode)
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add_executable(2019_15 15.cpp)
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target_link_libraries(2019_15 aocpp intcode)
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add_executable(16 16.cpp)
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target_link_libraries(16 aocpp)
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add_executable(2019_16 16.cpp)
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target_link_libraries(2019_16 aocpp)
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add_executable(17 17.cpp)
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target_link_libraries(17 aocpp intcode)
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add_executable(2019_17 17.cpp)
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target_link_libraries(2019_17 aocpp intcode)
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add_executable(18 18.cpp)
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target_link_libraries(18 aocpp)
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add_executable(2019_18 18.cpp)
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target_link_libraries(2019_18 aocpp)
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add_executable(19 19.cpp)
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target_link_libraries(19 aocpp intcode)
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add_executable(2019_19 19.cpp)
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target_link_libraries(2019_19 aocpp intcode)
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add_executable(20 20.cpp)
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target_link_libraries(20 aocpp)
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add_executable(2019_20 20.cpp)
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target_link_libraries(2019_20 aocpp)
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add_executable(21 21.cpp)
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target_link_libraries(21 aocpp intcode)
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add_executable(2019_21 21.cpp)
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target_link_libraries(2019_21 aocpp intcode)
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add_executable(22 22.cpp)
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target_link_libraries(22 aocpp zmod)
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add_executable(2019_22 22.cpp)
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target_link_libraries(2019_22 aocpp zmod)
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add_executable(23 23.cpp)
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target_link_libraries(23 aocpp intcode)
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add_executable(2019_23 23.cpp)
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target_link_libraries(2019_23 aocpp intcode)
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add_executable(24 24.cpp)
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target_link_libraries(24 aocpp)
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add_executable(2019_24 24.cpp)
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target_link_libraries(2019_24 aocpp)
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add_executable(25 25.cpp)
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target_link_libraries(25 aocpp intcode)
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add_executable(2019_25 25.cpp)
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target_link_libraries(2019_25 aocpp intcode)
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86
2020/01.cpp
Normal file
86
2020/01.cpp
Normal file
@ -0,0 +1,86 @@
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#include <algorithm>
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#include <bitset>
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#include <cstdint>
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#include <iostream>
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#include <sstream>
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#include <iterator>
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#include <vector>
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#include <doctest.h>
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#include <aocpp/Startup.hpp>
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namespace {
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auto Parse(std::istream & in) -> std::vector<std::int64_t>
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{
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std::vector<int64_t> result;
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std::int64_t x;
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while (in >> x) {
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result.push_back(x);
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}
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return result;
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}
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auto Part1(std::vector<std::int64_t> entries) {
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std::bitset<2020> numbers;
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std::sort(entries.begin(), entries.end());
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for (auto const i : entries) {
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if (i >= 2020) {
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break;
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}
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numbers.set(i);
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}
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for (auto const i : entries) {
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if (numbers.test(2020 - i)) {
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return (2020 - i) * i;
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}
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}
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throw std::runtime_error{"no part 1 solution"};
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}
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auto Part2(std::vector<std::int64_t> entries) {
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std::bitset<2020> numbers;
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std::sort(entries.begin(), entries.end());
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for (auto const i : entries) {
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if (i >= 2020) { break; }
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if (i < 2020) { numbers.set(i); }
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}
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for (auto it1 = entries.begin(); it1 != entries.end(); it1++) {
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for (auto it2 = std::next(it1); it2 != entries.end(); it2++) {
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auto target = 2020 - (*it1) - (*it2);
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if (target < 0) break;
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if (target < 2020 && numbers.test(target)) { return target * *it1 * *it2;}
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}
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}
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throw std::runtime_error{"no part 2 solution"};
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}
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}
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TEST_SUITE("documented examples") {
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std::istringstream in {
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"1721\n"
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"979\n"
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"366\n"
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"299\n"
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"675\n"
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"1456\n"};
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auto entries = Parse(in);
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TEST_CASE("part 1") {
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REQUIRE(Part1(entries) == 514579);
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}
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TEST_CASE("part 2") {
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REQUIRE(Part2(entries) == 241861950);
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}
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}
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auto main(int argc, char** argv) -> int {
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auto entries = Parse(aocpp::Startup(argc, argv));
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std::cout << "Part 1: " << Part1(entries) << std::endl;
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std::cout << "Part 2: " << Part2(entries) << std::endl;
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}
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2
2020/CMakeLists.txt
Normal file
2
2020/CMakeLists.txt
Normal file
@ -0,0 +1,2 @@
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add_executable(2020_01 01.cpp)
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target_link_libraries(2020_01 aocpp)
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@ -22,3 +22,4 @@ add_subdirectory(zmod)
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add_subdirectory(intcode)
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add_subdirectory(2017)
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add_subdirectory(2019)
|
||||
add_subdirectory(2020)
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
"generator": "Ninja",
|
||||
"binaryDir": "${sourceDir}/out/build/${presetName}",
|
||||
"cacheVariables": {
|
||||
"CMAKE_BUILD_TYPE": "RelWithDebInfo",
|
||||
"CMAKE_BUILD_TYPE": "Debug",
|
||||
"CMAKE_TOOLCHAIN_FILE": "",
|
||||
"CMAKE_INSTALL_PREFIX": "${sourceDir}/out/install/${presetName}"
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user