Added solution to Day6-2

Day6-2.cpp

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+//Fun/AdventCalendar2020/Day6-2.cpp
+//Matthew Ellison
+// Created: 12-06-20
+//Modified: 12-06-20
+//The sum of the counts of the questions answered yes in each group
+
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include "Stopwatch.hpp"
+#include "Algorithms.hpp"
+
+
+bool isFound(std::vector<char> ary, char ch){
+	for(char c : ary){
+		if(c == ch){
+			return true;
+		}
+	}
+	return false;
+}
+struct Person{
+	std::vector<char> yeses;
+};
+struct Group{
+	std::vector<Person> people;
+	std::vector<char> getYeses(){
+		std::vector<char> yeses;
+		//Go through every person in people and gather their yes answers into a single vector
+		for(Person per : people){
+			for(char ch : per.yeses){
+				//Add them to the vector only if they don't already exist
+				if(!isFound(yeses, ch)){
+					yeses.push_back(ch);
+				}
+			}
+		}
+		//Return the vector with all the yes answers
+		return yeses;
+	}
+	std::vector<char> getUniversalYeses(){
+		std::vector<char> yeses;
+		//You only need to look at the characters for the first person
+		for(char ch : people.front().yeses){
+			int yesCount = 1;
+			//Count how many times the character appears in all of the people
+			for(int cnt = 1;cnt < people.size();++cnt){
+				if(isFound(people[cnt].yeses, ch)){
+					++yesCount;
+				}
+			}
+			//If the character was in everyones "yeses" then add it to the array
+			if(yesCount == people.size()){
+				yeses.push_back(ch);
+			}
+		}
+		//Return the array of all univeral yeses
+		return yeses;
+	}
+};
+
+
+std::vector<Group> getInput(){
+	std::ifstream inputFile("inputs/Day6.txt");
+	std::vector<Group> groups;
+
+	//Go through the entire file
+	while(!inputFile.eof()){
+		Group group;
+		std::string currentLine;
+		//Each new line is a new person
+		std::getline(inputFile, currentLine);
+		//Go through the file until you find an empty line
+		//An empty line signifies a new group
+		while(!currentLine.empty()){
+			Person person;
+			//Add all characters to the vector
+			for(char ch : currentLine){
+				person.yeses.push_back(ch);
+			}
+			//Add the person to the group
+			group.people.push_back(person);
+			//Get the next line
+			std::getline(inputFile, currentLine);
+		}
+		//When a blank line is found move to a new group
+		groups.push_back(group);
+	}
+
+	//Return all of the groups in the file
+	return groups;
+}
+
+
+int main(){
+	mee::Stopwatch timer;
+	std::vector<int> yeses;
+
+	//Get the input from the file
+	std::vector<Group> groups = getInput();
+
+
+	//Start the timer
+	timer.start();
+
+	//Go through every group, get the number of yeses, and add it to the sum
+	for(Group group : groups){
+		yeses.push_back(group.getUniversalYeses().size());
+	}
+	//Get the sum of the number of yeses in all groups
+	int sum = mee::getSum(yeses);
+
+
+	//Stop the timer
+	timer.stop();
+
+	//Print the results
+	std::cout << "The sum of all yeses is " << sum
+			<< "\nIt took " << timer.getStr() << " to finish this problem" << std::endl;
+
+	return 0;
+}
+
+/* Results:
+The sum of all yeses is 3356
+It took 2.998 milliseconds to finish this problem
+*/