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为什么我的代码错在哪里啊?、求救

Posted by 382784268 at 2009-03-11 22:39:07 on Problem 2680
#include<iostream>
using namespace std;

int main()
{
	__int64 a[1001];
	a[1]=0;a[2]=1;a[3]=1;
	int i;
	for(i=4;i<=1000;i++)
	{
		if(i%2==0)
			a[i]=a[i-1]*2+1;
		else
			a[i]=a[i-1]*2-1;
	}
	int n;
	while(cin>>n)
	{
		printf("%I64d\n",a[n]);
	}
	return 0;
}

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