lastdig2-The last digit re-visited

The last digit re-visited

below given code is for lastdig2 spoj or the last digit re-visited spoj

#include <stdio.h>
#include <cstring>
int main()
{
 int B[10][5]={0,0,0,0,0,
      0,0,0,0,0,
      6,2,4,8,4,
      1,3,9,7,4,
      6,4,0,0,2,
      0,0,0,0,0,
      0,0,0,0,0,
      1,7,9,3,4,
      6,8,4,2,4,
      1,9,0,0,2,};
 int t;
 scanf("%d",&t);
 while(t--)
 {
  char A[1005];
  unsigned long long p;
  scanf("%s",A);
  scanf("%llu",&p);
  int len=strlen(A),temp,k;
  if(p==0)
   printf("1\n");
  else{
   temp=A[len-1]-48;
   if(temp==0)
    printf("0\n");
   else if(temp==1)
    printf("1\n");
   else if(temp==5)
    printf("5\n");
   else if(temp==6)
    printf("6\n");
   else{
    k=p%B[temp][4];
    printf("%d\n",B[temp][k]);
   }
  }
 }
}