A Times B

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Points:30 (partial)
Time limit:2.0s
Memory limit:256M
Author:
FatalEagle

Problem type

Allowed languages
C, C++, Pascal, Rust

For a while now, FatalEagle has been thinking about fast multiplication. He found the problem on SPOJ, MUL, and solved it without too much trouble. Then he found VFMUL on the same site, but the same code for MUL didn't pass as the SPOJ servers were really slow. Frustrated and desperate to show off demonstrate his fast multiplication code, FatalEagle has created a problem that really tests the accuracy and speed of your fast multiplication code.

Input Specification

The first line of input will have A.

The second line of input will have B.

Both A and B will be non-negative integers strictly less than 10^{1\,000\,001}.

Output Specification

Output the product A \times B.

Sample Input

123456123456123456123456123456123456
987987876876765765654654543543432432321321

Sample Output

121973153300851295215956247283945278187966162014464020099359068031370037005376

Comments


  • -14
    SnowSR
     commented on Dec. 6, 2015
    JAVA unavailable?

    Why not JAVA? Isn't BigInteger capable of processing numbers of any range?


    • 2
      Kirito
       commented on June 12, 2016

      Funny thing; I was reading the Java BigInteger documentation, and the fastest multiplication method would take 6 seconds on a worst case.


    • 12
      arock
       commented on Dec. 6, 2015

      That is precisely why Java is disallowed.


      • -3
        bobhob314
         commented on Dec. 7, 2015

        Don't even think you're going to win...

        Fite me ᕦ(ò_óˇ)ᕤ)


        • 14
          arock
           commented on Dec. 7, 2015

          ̿̿ ̿̿ ̿̿ ̿'̿'\̵͇̿̿\з= ( ▀ ͜͞ʖ▀) =ε/̵͇̿̿/’̿’̿ ̿ ̿̿ ̿̿ ̿̿

          hob plz


  • -9
    FatalEagle
     commented on Jan. 15, 2015
    Time Limit Changed

    Time limit lowered to 2s. Karatsuba shall not pass!


    • -2
      poinzetta
       commented on April 19, 2017

      What is the least Toom I need then?


  • -1
    bobhob314
     commented on Jan. 7, 2015
    Karatsuba?

    Any recommended algorithms?