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57 lines
1.8 KiB
Java
57 lines
1.8 KiB
Java
//ProjectEuler/Java/Problem3.java
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//Matthew Ellison
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// Created: 03-01-19
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//Modified: 03-28-19
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//The largest prime factor of 600851475143
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//Unless otherwise listed all non-standard includes are my own creation and available from https://bibucket.org/Mattrixwv/JavaClasses
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/*
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Copyright (C) 2019 Matthew Ellison
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import mattrixwv.Stopwatch;
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import mattrixwv.Algorithms;
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import java.math.BigInteger;
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import java.util.ArrayList;
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public class Problem3{
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private static final BigInteger NUMBER = BigInteger.valueOf(600851475143L);
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public static void main(String[] argv){
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Stopwatch timer = new Stopwatch(); //A timer to check execution time of the algorithm
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//Start the timer
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timer.start();
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//Get all the factors of the number
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ArrayList<BigInteger> factors = Algorithms.getFactors(NUMBER);
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//The last element should be the largest factor
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//Stop the timer
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timer.stop();
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//Print the results
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System.out.printf("The largest factor of the number %d is %d\n", NUMBER, factors.get(factors.size() - 1));
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System.out.printf("It took %s to run this algorithm\n", timer.getStr());
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}
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}
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/* Results:
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The largest factor of the number 600851475143 is 6857
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It took 674.398 milliseconds to run this algorithm
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*/
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