poj 1019 Number Sequence

来源:互联网 发布:spc数据自动生成 编辑:程序博客网 时间:2024/03/29 23:11

// poj 1019 Number Sequence
#include <iostream>
#include <algorithm>
using namespace std;


int mi[11];
int s[11],ss[11];


int main()
{
    mi[1]=1;
    for (int i=2;i<=10;i++) mi[i]=mi[i-1]*10;
    for (int i=1;i<=10;i++) { s[i]=(mi[i+1]-mi[i])*i; ss[i]=ss[i-1]+s[i];}
    int t;
    scanf("%d",&t);
    while(t--)
    {
              int n;
              scanf("%d",&n);
              int temp=0,d=1;
              __int64 sum=0;
              for (int i=1;;i++)
              {
                    if (i==mi[d+1]) d++;
//                    temp=(i-mi[d]+1)*d+ss[d-1];
                      temp+=d;
                    if (sum+temp>=n){
                                     n-=sum;
                                     if (n==0) { printf("%d/n",(i-1)%10); break;}
                                     for (int j=1;j<=10;j++)
                                     if (ss[j]>=n)
                                     {
                                         n-=ss[j-1];
                                         if (n==0) { n=9; break;}
                                         int b=j-(n-1)%j-1;
                                         n=mi[j]+(n-1)/j;
                                         n/=mi[b+1];
                                         break;
                                     }
                                     printf("%d/n",n%10);
                                     break;
                    }
                    sum+=temp;
              }
    }
   // system("pause");
    return 0;
}