> 总是WA，谁给看看哪错了？
> #include <iostream>
> 
> using namespace std;
> 
> int calcCoins(int days);
> 
> int main()
> {
> 	int days;
> 
> 	while(cin >> days && days)
> 	{
> 		cout << days << " " << calcCoins(days) << endl;
> 	}
> }
> 
> int calcCoins(int days)
> {
> 	int i, sum = 0, r = 0;
> 	for(i = 1; i <= days; i++)
> 	{
> 		sum = i * (i + 1) / 2;
> 		if(sum > days)
> 			break;
> 	}
> 
> 	for(int j = 1; j < i; j++)
> 	{
> 		r += j * j;
> 	}
> 
> 	r += i * (days + i - sum);
> 
> 	return r;
> }