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为什么我的代码错在哪里啊?、求救#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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