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Source/Problem8.cpp

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+//ProjectEuler/C++/Source/Problem8.cpp
+//Matthew Ellison
+// Created: 09-28-18
+//Modified: 07-14-19
+//Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?
+/*
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+05886116467109405077541002256983155200055935729725
+71636269561882670428252483600823257530420752963450
+*/
+//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/myClasses
+/*
+	Copyright (C) 2019  Matthew Ellison
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+
+#include <cinttypes>
+#include <string>
+#include <vector>
+#include <sstream>
+#include "Stopwatch.hpp"
+#include "../Headers/Problem.hpp"
+#include "../Headers/Problem8.hpp"
+
+
+std::string Problem8::number = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450";
+
+Problem8::Problem8() : Problem("Find the thirteen adjacent digits in the 1000-digit number that have the greatest product. What is the value of this product?"), maxProduct(0){
+
+}
+
+void Problem8::solve(){
+	//If the problem has already been solved do nothing and end the function
+	if(solved){
+		return;
+	}
+	//Start the timer
+	timer.start();
+
+	//Cycle through the string of numbers looking for the maximum product
+	for(unsigned int cnt = 12;cnt < number.size();++cnt){
+		uint64_t currentProduct = std::stoull(number.substr(cnt, 1)) * std::stoull(number.substr(cnt - 1, 1)) * std::stoull(number.substr(cnt - 2, 1)) * std::stoull(number.substr(cnt - 3, 1)) * std::stoull(number.substr(cnt - 4, 1)) * std::stoull(number.substr(cnt - 5, 1)) * std::stoull(number.substr(cnt - 6, 1)) * std::stoull(number.substr(cnt - 7, 1)) * std::stoull(number.substr(cnt - 8, 1)) * std::stoull(number.substr(cnt - 9, 1)) * std::stoull(number.substr(cnt - 10, 1)) * std::stoull(number.substr(cnt - 11, 1)) * std::stoull(number.substr(cnt - 12, 1));
+
+		//Check if the product is greater than the current maximum
+		//If it is currentNums is the new maximum
+		if(currentProduct > maxProduct){
+			maxNums = number.substr(cnt - 12, 13);
+			maxProduct = currentProduct;
+		}
+	}
+
+	//Stop the timer
+	timer.stop();
+
+	//Throw a flag to show the problem is solved
+	solved = true;
+}
+
+std::string Problem8::getString() const{
+	//If the problem hasn't been solved throw an exception
+	if(!solved){
+		throw unsolved();
+	}
+	std::stringstream results;
+	results << "The greatest product is " << maxProduct
+			<< "\nThe numbers are " << maxNums;
+	return results.str();
+}
+
+std::string Problem8::getLargestNums() const{
+	//If the problem hasn't been solved throw an exception
+	if(!solved){
+		throw unsolved();
+	}
+	return maxNums;
+}
+
+uint64_t Problem8::getLargestProduct() const{
+	//If the problem hasn't been solved throw an exception
+	if(!solved){
+		throw unsolved();
+	}
+	return maxProduct;
+}