> #include<iostream>
> 
> using namespace std;
> 
> __int64 p,r,k1,k2,n=0,s[20],q[15],k,kbefore;
> 
> int s_i,q_i;
> 
> 
> int sum(__int64 k,__int64 *s,int s_i,int sign)
> {		k1=0;
> 		__int64 temp,temp1,begin1,begin,end,mid;
> 		
> 		while(k1<k)
> 		{   
> 			temp=(s[s_i+1]-s[s_i])*s_i;
> 			if(k1+temp<k)
> 		     {k1+=temp; s_i++;}
> 		    else break;
> 		    
> 		}
> 		if(k1+temp==k)
> 		{ 
> 		  if(sign==0)temp1=(s[s_i+1]-1)*(s[s_i+1]-1);
> 		  else temp1=s[s_i+1]-1;
> 		  p=temp1%10;
> 		  k1=k;
> 		}
> 	  else
> 	  {   begin=s[s_i],end=s[s_i+1]-1,begin1=begin;
> 		  while(begin<=end)
> 		  {  
> 			  mid=(begin+end)/2;
> 			  if((mid-begin1+1)*s_i+k1>k)
> 			  {
> 				if((mid-begin1)*s_i+k1<k)
> 				{   if(sign==0)p=mid*mid;
> 				    else p=mid;
> 					k1+=(mid-begin1+1)*s_i;
> 					break;
> 				}
> 				else end=mid-1;
> 			}
> 			else if((mid-begin1+1)*s_i+k1<k)
> 			{
> 				if((mid-begin1+2)*s_i+k1>k)
> 				{   if(sign==0)p=(mid+1)*(mid+1);
> 				    else p=mid+1;
> 					k1+=(mid-begin1+2)*s_i;
> 					break;
> 				}
> 				else begin=mid+1;
> 			}
> 			else 
> 			{   if(sign==0)p=mid*mid;
> 			    else p=mid;
> 				k=k1;
> 				break;
> 			}
> 		}
> 	  }
>      for(int i=0;i<k1-k;i++)
> 		p/=10;
> 	 
> 	 return p%10;
> }
> 
> int sum1(__int64 k)
> {
> 	int Sum=sum(k,s,1,0)+sum(k,q,1,1);
> 	return Sum;
> }
> 
> int Inc(__int64 k)
> {
> 	int m=1,t=1;
> 	   while(t)
> 	   { 
> 		   int temp=sum1(k+m);
> 	   while(temp>9)
> 	   {
> 		   m++;
> 		   temp=sum1(k+m);
> 	   }
> 	     t=0;
> 	   if(temp==9&&sum1(k+m+1)>9)
> 		   m+=2;
> 	    
> 	   }
> 	   while(m>1)
> 	   {
> 		   t=(t+sum1(k+m-1))/10;
> 		   m--;
> 	   }
>   return t;
> }
> 
> int  main()
> {  
> 	s[1]=1,s[2]=4,s[3]=10,s[4]=32,s[5]=100,s[6]=317,s[7]=1000,s[8]=3163,s[9]=10000,s[10]=31623;
> 	s[11]=100000,s[12]=316228,s[13]=1000000,s[14]=3162278,s[15]=10000000,s[16]=31622777,s[17]=100000000;
> 	s[18]=316227767,s[19]=1000000000;
>     
> 	q[1]=1,q[2]=10,q[3]=100,q[4]=1000,q[5]=10000,q[6]=100000,q[7]=1000000,q[8]=10000000,q[9]=100000000;
> 	q[10]=1000000000,q[11]=10000000000,q[12]=100000000000,q[13]=1000000000000,q[14]=10000000000000;
> 	
>    scanf("%Id",&k);
>    while(k)
>    {
> 		cout<<(sum1(k)+Inc(k))%10;
>       cout<<endl;
> 	 scanf("%Id",&k);
>    }
>     return 0;
> 
>   return 0;
> }
> 

• 用%I64d也不行，WA (0) zxqi_009 2005-08-01 10:28:40