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  1. import java.util.HashSet;
  2. import java.util.Scanner;
  3. import java.util.Set;
  4.  
  5. class PrimeFactorisation {
  6.  
  7.   /**
  8.    * Code obtained from studyalgorithms.com
  9.    */
  10.  
  11.   public static void main(String[] args) {
  12.  
  13.     Scanner scanner = new Scanner(System.in);
  14.     long N = scanner.nextLong();
  15.     Set<Long> primeFactors = new HashSet<>();
  16.  
  17.     while (N % 2 == 0) {
  18.       N /= 2;
  19.       primeFactors.add(2L);
  20.     }
  21.  
  22.     for (long j = 3; j <= Math.sqrt(N); j += 2) {
  23.       while (N % j == 0) {
  24.         N /= j;
  25.         primeFactors.add(j);
  26.       }
  27.     }
  28.  
  29.     if (N > 2)
  30.       primeFactors.add(N);
  31.  
  32.     for (Long primeFactor : primeFactors) {
  33.       System.out.print(primeFactor + " ");
  34.     }
  35.  
  36.   }
  37. }
  38.  
Success #stdin #stdout 0.07s 4386816KB
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https://ideone.com/TRw7lA
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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