poj_2000

/*
//ACM Poj 2000
//File: 2000.cpp
//Author: Kangzj
//Mail: Kangzj@mail.bnu.edu.cn
//Date: April 24, 2009
*/
#include
#include
#include $using namespace std;
int main()
{
  int day;
  int coinDay, coinAll;
  ostringstream buff;
    while(1)
  {
        cin>>day;
        if(day==0)break;
    float temp=sqrt(1+8*day);
    int tmp=(int)temp;
    if(temp!=(float)tmp && tmp%2!=0)
    {
      tmp+=2;
    }else if(temp!=(float)tmp && tmp%2==0)
    {
      tmp++;
    }else
    {
      tmp=tmp;
    }
    coinDay=(-1+tmp)/2;
    coinDay--;
    coinAll=coinDay*(coinDay+1)*(2*coinDay+1)/6;
    coinAll+=(coinDay+1)*(day-(coinDay+1)*coinDay/2);
    buff< 需要选择G++才能通过，如果想用C++，只要加几个强制转换就可以了。$ 

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