28 lines
854 B
Java
28 lines
854 B
Java
// Author: Rodney Shaghoulian
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// Github: github.com/RodneyShag
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// HackerRank: hackerrank.com/RodneyShag
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import java.util.Scanner;
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import java.math.BigInteger;
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/*
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I use isProbablePrime() with certainty = 10 to achieve 99.9% accuracy.
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However, even certainty = 1 (which achieves 50% accuracy) is enough to
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pass the HackerRank test cases.
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isProbablePrime() is always 100% certain if it tells you if a number
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is "not prime". If it says "prime", it's only 99.9% certain. It may be
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the case that it just hasn't found a prime number number that divides
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the BigInteger yet.
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*/
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public class Solution {
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public static void main(String[] args) {
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Scanner scan = new Scanner(System.in);
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BigInteger n = scan.nextBigInteger();
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scan.close();
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System.out.println(n.isProbablePrime(10) ? "prime" : "not prime");
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}
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}
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