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101 lines
3.1 KiB
Python
101 lines
3.1 KiB
Python
#ProjectEuler/Python/Problem3.py
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#Matthew Ellison
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# Created: 01-27-19
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#Modified: 07-17-20
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#The largest prime factor of 600851475143
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#Unless otherwise listed, all of my non-standard imports can be gotten from my pyClasses repository at https://bitbucket.org/Mattrixwv/pyClasses
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"""
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Copyright (C) 2020 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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from Problems.Problem import Problem
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from Stopwatch import Stopwatch
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from Algorithms import getFactors
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from Unsolved import Unsolved
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class Problem3(Problem):
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#Variables
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__goalNumber = 600851475143
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#Functions
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#Constructor
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def __init__(self):
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super().__init__("What is the largest prime factor of 600851475143?")
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self.factors = []
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#Operational functions
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#Solve the problem
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def solve(self):
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#If the problem has already been solved do nothing and end the function
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if(self.solved):
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return
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#Start the timer
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self.timer.start()
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#Get the factors of the number
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self.factors = getFactors(self.__goalNumber)
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#The last element should be the largest factor
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#Stop the timer
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self.timer.stop()
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#Save the results
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self.result = "The largest prime factor of " + str(self.__goalNumber) + " is " + str(self.factors[(len(self.factors) - 1)])
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#Throw a flag to show the problem is solved
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self.solved = True
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#Reset the problem so it can be run again
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def reset(self):
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super().reset()
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self.factors.clear()
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#Gets
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#Returns the list of factors of the number
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def getFactors(self) -> list:
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#If the problem hasn't been solved throw an exceptions
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if(not self.solved):
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raise Unsolved("You must solve the problem before you can get the factors")
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return self.factors
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#Returns the largest factor of the number
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def getLargestFactor(self) -> int:
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#If the problem hasn't been solved throw an exceptions
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if(not self.solved):
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raise Unsolved("You must solve the problem before you can get the largest factor")
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return self.factors[(len(self.factors) - 1)]
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#Returns the number for which we are getting the factor
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def getGoalNumber(self) -> int:
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return self.__goalNumber
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#If you are running this file, automatically start the correct function
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if __name__ == '__main__':
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problem = Problem3()
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print(problem.getDescription()) #Print the description of the problem
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problem.solve() #Solve the problem
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#Print the results
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print(problem.getResult())
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print("It took " + problem.getTime() + " to solve this algorithm")
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"""Results:
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The largest prime factor of 600851475143 is 6857
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It took 1.685 seconds to run this algorithm
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"""
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