AdventOfCode2021/03/main.cpp

#include "main.h"

void part1(){
	QFile input("input.txt");
	QTextStream strm(&input);
	if(!input.open(QIODevice::ReadOnly | QIODevice::Text)){
		qDebug() << "file borked";
	}
	int vals[] = {0,0,0,0,0,0,0,0,0,0,0,0};
	int i = 0;
	int lines = 0;
	unsigned short gamma = 0;
	unsigned short epsilon = 0;
	qDebug() << gamma;
	QString line = "";
	while(!strm.atEnd()){
		lines++;
		line = strm.readLine();
		for (i=0;i<12;i++){
			vals[i] += (line.toStdString()[i]-'0');
		}
	}
	for(i=0;i<12;i++){
		if(vals[i] > (lines/2)){
			gamma +=1;
		}
		if(i < 11){
			gamma <<=1;
		}
	}
	epsilon = ~gamma;
	epsilon = epsilon & 0b0000111111111111; //bitmask with 0b0000 1111 1111 1111
	qDebug() << epsilon;
	qDebug() << gamma;
	qDebug() << (gamma*epsilon);

}

void part2(){
	QFile input("input.txt");
	QTextStream strm(&input);
	if(!input.open(QIODevice::ReadOnly | QIODevice::Text)){
		qDebug() << "file borked";
	}
	int vals[] = {0,0,0,0,0,0,0,0,0,0,0,0};
	int lncnt = 0;
    QStringList* oxygenlist = new QStringList;
    QStringList* co2list = new QStringList;
	QString line = "";
	while(!strm.atEnd()){
		line = strm.readLine();
		oxygenlist->append(line);
		co2list->append(line);
		lncnt++;
        for (int i=0;i<12;i++){
			vals[i] += (line.toStdString()[i]-'0');
		}
	}

		
    for(unsigned long long i = 0;i<sizeof(vals);i++){
        for(int j=0;j<oxygenlist->size();j++){
            if (oxygenlist->size() == 1){
                continue;
            }
            if(vals[i] >= (lncnt / 2)){
                if(oxygenlist->at(j).toStdString()[i] == '0'){
					oxygenlist->removeAt(j);
                }
            }else{
                if(oxygenlist->at(j).toStdString()[i] == '1'){
                    oxygenlist->removeAt(j);
                }
            }
		}
        for(int j=0;j<co2list->size();j++){
            if (co2list->size() == 1){
                continue;
            }
			if(vals[i] < (lncnt / 2)){
                if(co2list->at(j).toStdString()[i] == '0'){
                    co2list->removeAt(j);
				}
            }else{
                if(co2list->at(j).toStdString()[i] == '1'){
                    co2list->removeAt(j);
                }
            }
		}
	}
    int num1 = co2list->at(0).toInt(nullptr,2);
    int num2 = oxygenlist->at(0).toInt(nullptr,2);

    qDebug() << co2list->at(0);
    qDebug() << num1;
    qDebug() << oxygenlist->at(0);
    qDebug() << num2;
    qDebug() << num1 * num2;
}

int main(int argc, char **argv){
	part2();
	return 0;
}