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同志们，看看我的程序，测试数据都是对的，而且我没能发现错误，请求帮助#include <stdio.h>
long tri(int n)
{
if(n==1)return 3;
if(n==2)return 11;
long sum,i,temp;
sum=1;
temp=3;
for(i=1;i<n;i++){
sum=sum+temp;
temp=3*temp+2*(sum-temp);
}
return temp;
}
void main()
{
int input;
scanf("%d",&input);
while(input!=-1){
if(input%2==1||input==0)printf("0\n");
else printf("%ld\n",tri(input/2));
scanf("%d",&input);
}
}
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