AoC2022_Day13/main.cpp

#define OLC_PGE_APPLICATION
#include "pixelGameEngine.h"
#include "olcutils.h"
#include "List.h"
#include <cassert>

enum status{
    FALSE,
    TRUE,
    CONTINUE
};

status examineList(List*list1,List*list2){
    std::cout<<"Examining "<<*list1<<" vs "<<*list2<<std::endl;
    while (true) {
        if (list2->index>=list2->elements.size()&&list1->elements.size()>list1->index){
            return FALSE;
        }
        if (list1->index>=list1->elements.size()){
            if (list2->index>=list2->elements.size()){
                return CONTINUE;
            }
            return TRUE;
        }
        Element e1=list1->elements[list1->index];
        Element e2=list2->elements[list2->index];
        if (e1.list==nullptr&&e2.list==nullptr){
            if (e1.number<e2.number){
                return TRUE;
            } else if (e1.number>e2.number){
                return FALSE;
            }
        } else 
        if (e1.list!=nullptr&&e2.list!=nullptr){
            status Result = examineList(e1.list,e2.list);
            if (Result!=CONTINUE){
                return Result;
            }
        } else {
            if (e1.list==nullptr){
                e1.list = new List();
                Element newE;
                newE.number=e1.number;
                e1.list->elements.push_back(newE);
                status Result = examineList(e1.list,e2.list);
                if (Result!=CONTINUE){
                    return Result;
                }   
            } else {
                e2.list = new List();
                Element newE;
                newE.number=e2.number;
                e2.list->elements.push_back(newE);
                status Result = examineList(e1.list,e2.list);
                if (Result!=CONTINUE){
                    return Result;
                }   
            }
        }
        list1->index++;
        list2->index++;
    }
    return TRUE; //Inputs are in the right order.
}

using namespace olc;
int main()
{
    int sum=0;
	std::ifstream file("input");
    int index=1;
    std::vector<List*>lists;
    while (file.good()){
        std::string line;
        List*list1;
        List*list2;
        for (int j=0;j<2;j++){
            std::getline(file,line);
            List*startingList=new List();
            List*currentList=nullptr;
            for (int i=0;i<line.length();i++){
                if (line[i]=='['){
                    //std::cout<<"Read "<<line[i]<<"...";
                    if (currentList==nullptr){
                        currentList=startingList;
                    } else {
                        List*newList=new List();
                        Element el;
                        el.list=newList;
                        newList->parent=currentList;
                        currentList->elements.push_back(el);
                        currentList=el.list;
                    }
                } else 
                if (line[i]==']'){
                    //std::cout<<"Read "<<line[i]<<"...";
                    currentList=currentList->parent;
                } else 
                if (line[i]==','){
                    //std::cout<<"Read "<<line[i]<<"...";
                    continue;
                } else {//Assume it's a digit.
                    std::string acc="";
                    while (line[i]>='0'&&line[i]<='9'){
                        //std::cout<<"Read "<<line[i]<<"...";
                        acc+=line[i++];
                    }
                    Element el;
                    el.number=std::atoi(acc.c_str());
                    currentList->elements.push_back(el);
                    i--;
                }
            }
            if (j==0){
                list1=startingList;
            } else {
                list2=startingList;
            }
        }
        std::getline(file,line);
        std::cout<<"List 1: "<<*list1<<std::endl;
        std::cout<<"List 2: "<<*list2<<std::endl;
        bool passed=true;
        if (passed) {
            passed=examineList(list1,list2);
        }
        if (passed){
            sum+=index;
            std::cout<<"Passed! Sum:"<<sum<<std::endl;
        } else {
            std::cout<<"Failed"<<std::endl;
        }
        index++;
    }
    std::cout<<"Sum: "<<sum<<std::endl;

	return 0;
}