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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     public static void main(String[] args) {
  11.  
  12.         int[] a = new int[]{3, 2, 1};
  13.         int[] b = new int[]{8, 9};
  14.         int[] rMultiplicacion = multiplicar(a, b);
  15.         toString(rMultiplicacion);
  16.     }
  17.  
  18.     public static int[] multiplicar(int[] a, int[] b) {
  19.         int[] r = new int[a.length + b.length + 1];
  20.  
  21.         for (int i = a.length - 1; i >= 0; i--) {
  22.             for (int j = b.length - 1; j >= 0; j--) {
  23.                 int mul = r[i + j] + a[i] * b[j];
  24.                 r[i + j] = mul % 10;
  25.                 r[i + j + 1] += mul / 10;
  26.             }
  27.         }
  28.         return r;
  29.     }
  30.  
  31.     public static void toString(int[] a) {
  32.         for (int i = a.length - 1; i >= 0; i--) {
  33.             System.out.print(a[i]);
  34.         }
  35.         System.out.println();
  36.     }
  37. }
Success #stdin #stdout 0.06s 32436KB
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00111054
https://ideone.com/jpAcRv
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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