AdventOfCode2024/24.2.cpp at master · EgorexW/AdventOfCode2024 · GitHub

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#include <fstream>
#include <iostream>
#include <map>
#include <numeric>
#include <set>
#include <unordered_set>
using namespace std;

enum Condition {
    AND,
    OR,
    XOR
};
enum VariableType {
    Input,
    BaseDigit,
    BaseCarryOn,
    Digit,
    PartialCarryOn,
    CarryOn
};

struct Rule {
    explicit Rule(const string & lineTmp) {
        in1 = lineTmp.substr(0, 3);
        int nextIndex = 8;
        if (lineTmp.substr(4, 2) == "OR") {
            condition = Condition::OR;
            nextIndex = 7;
        } else if (lineTmp.substr(4, 3) == "AND") {
            condition = Condition::AND;
        } else {
            condition = Condition::XOR;
        }
        in2 = lineTmp.substr(nextIndex, 3);
        out = lineTmp.substr(nextIndex + 7, 3);
    }

    string in1;
    string in2;
    string out;
    Condition condition;
};

struct Variable {
    VariableType type;
    int nr;
    int outOfPlace;
};

int main() {
    ifstream in("Input.txt");

    string lineTmp;
    map<string, Variable> variables;
    while (getline(in, lineTmp)) {
        if (lineTmp.empty()) {
            break;
        }
        variables[lineTmp.substr(0, 3)] = Variable(Input);
    }

    vector<Rule> rulesToDescribe;
    while (getline(in, lineTmp)) {
        auto rule = Rule(lineTmp);
        rulesToDescribe.push_back(rule);
    }

    while (true) {
        bool changed = false;
        for (const auto& rule : rulesToDescribe) {
            if (variables.contains(rule.out)) {
                continue;
            }
            if (!variables.contains(rule.in1) || !variables.contains(rule.in2)) {
                continue;
            }
            changed = true;
            if (rule.in1[0] == 'x' || rule.in1[0] == 'y') {
                int nr = stoi(rule.in1.substr(1, 2));
                if (rule.condition == XOR) {
                    variables[rule.out] = Variable(BaseDigit, nr);
                    if (nr == 0) {
                        variables[rule.out] = Variable(Digit, 0);
                    }
                } else {
                    variables[rule.out] = Variable(BaseCarryOn, nr);
                    if (nr == 0) {
                        variables[rule.out] = Variable(CarryOn, 0);
                    }
                }
            } else {
                auto variable1 = variables[rule.in1];
                auto variable2 = variables[rule.in2];
                switch (rule.condition) {
                    case XOR:
                        if (rule.out[0] == 'z') {
                            variables[rule.out] = Variable(Digit, stoi(rule.out.substr(1, 2)));
                        }
                        if (variable1.type != BaseDigit && variable1.type != CarryOn) {
                            variables[rule.in1].outOfPlace ++;
                        }
                        if (variable2.type != BaseDigit && variable2.type != CarryOn) {
                            variables[rule.in2].outOfPlace ++;
                        }
                        if (variables.contains(rule.out)) {
                            if (variable1.nr != variables[rule.out].nr) {
                                variables[rule.in1].outOfPlace ++;
                            }
                        }
                        if (variable1.type == BaseDigit && variable2.type == CarryOn) {
                            if (variable1.nr == variable2.nr + 1) {
                                variables[rule.out] = Variable(Digit, variable1.nr);
                            }
                        } else if (variable1.type == CarryOn && variable2.type == BaseDigit) {
                            if (variable2.nr == variable1.nr + 1) {
                                variables[rule.out] = Variable(Digit, variable2.nr);
                            }
                        }
                    // case BaseDigit:
                    //     if (variable2.type != CarryOn || variable2.nr != variable1.nr - 1) {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    //     if (rule.condition == XOR) {
                    //         variables[rule.out] = Variable(Digit, variable1.nr);
                    //     } if (rule.condition == AND) {
                    //         variables[rule.out] = Variable(PartialCarryOn, variable1.nr);
                    //     } else {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    //     break;
                    // case CarryOn:
                    //     if (variable2.type != BaseDigit || variable2.nr != variable1.nr + 1) {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    //     if (rule.condition == XOR) {
                    //         variables[rule.out] = Variable(Digit, variable1.nr + 1);
                    //     } if (rule.condition == AND) {
                    //         variables[rule.out] = Variable(PartialCarryOn, variable1.nr + 1);
                    //     } else {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    //     break;
                    // case BaseCarryOn:
                    //     if (variable2.type != PartialCarryOn || variable2.nr != variable1.nr) {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    //     if (rule.condition == OR) {
                    //         variables[rule.out] = Variable(CarryOn, variable1.nr);
                    //     } else {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    // case PartialCarryOn:
                    //     if (variable2.type != BaseCarryOn || variable2.nr != variable1.nr) {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    //     if (rule.condition == OR) {
                    //         variables[rule.out] = Variable(CarryOn, variable1.nr);
                    //     } else {
                    //         VariablesOutOfPlace(variables, rule);
                    //     }
                    // default:
                    //     cerr << "Should not happen" << endl;
                }
            }
        }
        if (!changed) {
            break;
        }
    }

    for (const auto& variable : variables) {
        if (variable.second.outOfPlace > 0) {
            cout << "Variable " << variable.first << " is out of place " << variable.second.outOfPlace << " times" << endl;
        }
    }
}