题目链接:http://poj.org/problem?id=2000

题目大意:求N天得到多少个金币,第一天得到1个,第二、三天得到2个,第四、五、六天得到3个、、、、以此类推,得到第N天的金币数。

 #include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int main ()
{
int x,n,p;
while(cin>>n)
{
if (n==)
break;
x=p=;
int sum=;
while(x<=n)
{
for(int i=x;i<x+p&&i<=n;i++)
sum+=p;
x=x+p;
p++;
}
cout<<n<<" "<<sum<<endl;
}
return ;
}

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