救命！样例都过不了，求救！

#include<iostream>
using namespace std;

int main()
{
	int n;
	double a, t;
	int s[2000000];
	for (int i = 0; i < 2000000; i++)
	{
		s[i] = -1;
	}
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		cin >> a >> t;
		for ( double j = 1; j <= t; j++)
		{
			if (s[(int)(j * a)] == -1) 
			{
				s[(int)(j * (int)a)] = 1;
			}
			else 
			{
				s[(int)(j * a)] = -1;
			}
		}
	}
	for (int i = 1; i < 2000000; i++)
	{
		if (s[i] == 1)
		{
			cout << i;
			break;
		}
	}
	system("pause");
	return 0;
}