Submission #9714

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
9714	2014-09-28 08:19:46	yukariko	Quaternion inverse (kriii2_Q)	C11	0 / 4	0 ms	1088 KiB

Q

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int ra,rb,rc,rd;
mod(a,m)
{
  return a<0?mod(a+m,m):a%m;
}
f(a1,b1,c1,d1,m)
{
  int a2,b2,c2,d2;
  for(a2=m-1;a2>=1;a2--)
  {
    for(b2=m-1;b2>=1;b2--)
    {
      for(c2=m-1;c2>=1;c2--)
      {
        for(d2=m-1;d2>=1;d2--)
        {
          ra=mod(a1*a2-b1*b2-c1*c2-d1*d2,m);
          rb=mod(a1*b2+b1*a2+c1*d2-d1*c2,m);
          rc=mod(a1*c2-b1*d2+c1*a2+d1*b2,m);
          rd=mod(a1*d2+b1*c2-c1*b2+d1*a2,m);
          if(ra==1&&rb==0&&rc==0&&rd==0)
          {
            ra=a2;rb=b2;rc=c2;rd=d2;
            return;
          }
        }
      }
    }
  }
  ra=rb=rc=rd=0;
 
 
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• Subtask 1: 0 / 1
• Subtask 2: 0 / 3