题解 | #大吉大利，今晚吃鸡#
大吉大利，今晚吃鸡
https://www.nowcoder.com/practice/c9d9f9c60b4448eabc0569f80a3461bb
#include <stdio.h>
int squre(int n)
{
int ed = 1;
for(n;n > 0;n--)
ed *= 3;
return ed - 1;
}
int main() {
int n = 0;
int count = 0;
while(scanf("%d",&n)!=EOF)
{ count = squre(n);
printf("%d \n",count);
} return 0;
}
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