求助

#include <iostream>
using namespace std;
int main()
{
	int n;
	cin >> n;
	int day=0;
	int gold=0;//总金币数
	int coin=1;//每天获得的金币
	while(day!=n)
	{
		int k=1;
		for(int i=0;i<k;i++)
		{
			gold=gold+coin;
			cout << coin << "," << gold << endl;//用于观察coin和gold的变化情况
			day++;
		}
		k++;
		coin++;//每个周期后coin+1
	}
	cout << gold << endl;
	return 0;
}