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  1. import java.util.ArrayList;
  2. import java.util.List;
  3.  
  4. class AchaPrimos {
  5.  
  6.     public static boolean primo(int num) {
  7.         for (int i = 2; i < num; i++) {
  8.             if (num % i == 0) return false;
  9.         }
  10.  
  11.         return true;
  12.     }
  13.  
  14.     public static List<Integer> fatorar(int x) {
  15.        List<Integer> numeros = new ArrayList<Integer>();
  16.        int aux = x, s = (int) Math.sqrt(x);
  17.  
  18.        for (int i = 2; i <= s; i++) {
  19.             if (primo(i)) {
  20.                 while (aux % i == 0) {
  21.                     aux /= i;
  22.                     s = (int) Math.sqrt(aux);
  23.                     numeros.add(i);
  24.                 }
  25.             }
  26.        }
  27.  
  28.        if (aux != 1 || numeros.isEmpty()) numeros.add(aux);
  29.        return numeros;
  30.     }
  31.  
  32.     public static void main(String[] args) {
  33.         System.out.println("36: " + fatorar(36));
  34.         System.out.println("60: " + fatorar(60));
  35.         System.out.println("120: " + fatorar(120));
  36.         System.out.println("144: " + fatorar(144));
  37.         System.out.println("97: " + fatorar(97));
  38.         System.out.println("128: " + fatorar(128));
  39.         System.out.println("15: " + fatorar(15));
  40.         System.out.println("2: " + fatorar(2));
  41.         System.out.println("7: " + fatorar(7));
  42.         System.out.println("1: " + fatorar(1));
  43.         System.out.println("0: " + fatorar(0));
  44.     }
  45. }
Success #stdin #stdout 0.05s 4386816KB
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stdin
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Standard input is empty
stdout
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36: [2, 2, 3, 3]
60: [2, 2, 3, 5]
120: [2, 2, 2, 3, 5]
144: [2, 2, 2, 2, 3, 3]
97: [97]
128: [2, 2, 2, 2, 2, 2, 2]
15: [3, 5]
2: [2]
7: [7]
1: [1]
0: [0]
https://ideone.com/DEanhc
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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