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day_23a.cpp
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day_23a.cpp
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#include <array>
#include <fstream>
#include <functional>
#include <iostream>
#include <ranges>
#include <string>
#include <vector>
#include <algorithm>
#include <variant>
int sv_to_int (const std::string_view sv) {
bool negative = (sv[0] == '-') ? true : false;
int n = 0;
for (int i = negative ? 1 : 0; i < sv.size(); i++) {
n = n * 10 + (sv[i] - '0');
}
if (negative) {
n *= -1;
}
return n;
}
enum class InstructionType {
CPY, INC, DEC, JNZ, TGL
};
struct Instruction {
InstructionType type;
int val = 0;
int val_2 = 0;
bool toggled = false;
std::function<void(std::array<int, 4>&, int&, std::vector<Instruction>& instrs)> process;
std::function<void(std::array<int, 4>&, int&, std::vector<Instruction>& instrs)> process_toggled;
void process_wrapper (std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
if (toggled) {
process_toggled(state, instr_ptr, instrs);
} else {
process(state, instr_ptr,instrs);
}
}
};
Instruction createInstruction(const std::vector<std::string>& split_line) {
std::cout << split_line[0] << '\n';
Instruction instr;
if (split_line[0] == "cpy") {
instr.type = InstructionType::CPY;
if (char(split_line[1][0]) >= 'a' && char(split_line[1][0]) <= 'd') {
const int register_1 = split_line[1][0] - 'a';
const int register_2 = split_line[2][0] - 'a';
instr.process = [register_1, register_2](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
state[register_2] = state[register_1];
instr_ptr++;
};
} else if (char(split_line[2][0]) >= 'a' && char(split_line[2][0]) <= 'd'){
const int val_1 = sv_to_int(split_line[1]);
const int register_2 = split_line[2][0] - 'a';
instr.process = [val_1, register_2](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
state[register_2] = val_1;
instr_ptr++;
};
} else {
instr.process = [](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
instr_ptr++;
return;
};
}
} else if (split_line[0] == "inc") {
instr.type = InstructionType::INC;
const int register_1 = split_line[1][0] - 'a';
instr.process = [register_1](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
instr_ptr++;
state[register_1]++;
};
} else if (split_line[0] == "dec") {
instr.type = InstructionType::DEC;
const int register_1 = split_line[1][0] - 'a';
instr.process = [register_1](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
instr_ptr++;
state[register_1]--;
};
} else if (split_line[0] == "jnz") {
instr.type = InstructionType::JNZ;
std::variant<int, char> var_val_1;
std::variant<int, char> var_val_2;
if (char(split_line[1][0]) >= 'a' && char(split_line[1][0]) <= 'd') {
var_val_1 = char(split_line[1][0]);
} else {
var_val_1 = sv_to_int(split_line[1]);
}
if (char(split_line[2][0]) >= 'a' && char(split_line[2][0]) <= 'd') {
var_val_2 = char(split_line[2][0]);
} else {
var_val_2 = sv_to_int(split_line[2]);
}
instr.process = [var_val_1, var_val_2](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
const bool first_is_not_zero = ((std::holds_alternative<char>(var_val_1) ? state[std::get<1>(var_val_1) - 'a'] : std::get<0>(var_val_1)) != 0);
if (first_is_not_zero) {
// std::cout << (std::holds_alternative<char>(var_val_2) ? (std::get<1>(var_val_2) - 'a'): std::get<0>(var_val_2)) << '\n';
instr_ptr += (std::holds_alternative<char>(var_val_2) ? state[std::get<1>(var_val_2) - 'a']: std::get<0>(var_val_2));
} else {
instr_ptr++;
}
};
} else if(split_line[0] == "tgl") {
instr.type = InstructionType::TGL;
if (char(split_line[1][0]) >= 'a' && char(split_line[1][0]) <= 'd') {
const int register_1 = split_line[1][0] - 'a';
instr.process = [register_1](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
const int val = state[register_1] + instr_ptr;
if(val < instrs.size()) {
// std::cout << "toggling: " << val << '\n';
instrs[val].toggled = !instrs[val].toggled;
}
instr_ptr++;
};
} else {
const int val_1 = sv_to_int(split_line[1]);
instr.process = [val_1](std::array<int, 4>& state, int& instr_ptr, std::vector<Instruction>& instrs) {
const int val = val_1 + instr_ptr;
if(val < instrs.size()) {
// std::cout << "toggling: " << val << '\n';
instrs[val].toggled = !instrs[val].toggled;
}
instr_ptr++;
};
}
} else {
std::cout << "This should not happen" << '\n';
exit(0);
}
return instr;
}
int main(int argc, char* argv[]) {
std::string input = "../input/day_23_input";
if (argc > 1) {
input = argv[1];
}
std::ifstream file(input);
std::string line;
std::vector<std::string> parsed_lines;
std::vector<std::vector<std::string>> parsed_instructions;
std::vector<Instruction> instructions;
std::array<int, 4> registers {{7,0,0,0}};
while(std::getline(file, line)) {
// std::cout << line << '\n';
parsed_lines.push_back(line);
parsed_instructions.emplace_back();
auto& split_line = parsed_instructions.back();
std::ranges::copy(parsed_lines.back()
| std::ranges::views::split(' ')
| std::ranges::views::transform([](auto&& rng) {return std::string{std::string_view(rng)};}),
std::back_inserter(split_line));
Instruction instr = createInstruction(split_line);
if (instr.type == InstructionType::CPY) {
split_line[0] = "jnz";
}
if (instr.type == InstructionType::INC) {
split_line[0] = "dec";
}
if (instr.type == InstructionType::DEC) {
split_line[0] = "inc";
}
if (instr.type == InstructionType::JNZ) {
split_line[0] = "cpy";
}
if (instr.type == InstructionType::TGL) {
split_line[0] = "inc";
}
const Instruction instr_toggled = createInstruction(split_line);
instr.process_toggled = instr_toggled.process;
instructions.push_back(instr);
}
int instr_ptr = 0;
registers['c' - 'a'] = 1;
while(instr_ptr < instructions.size()) {
instructions[instr_ptr].process_wrapper(registers, instr_ptr, instructions);
// for (const auto& ele : registers) {
// std::cout << ele << ' ';
// }
// std::cout << " | " << instr_ptr;
// std::cout << '\n';
}
std::cout << registers[0] << '\n';
}