这串代码应该怎么改？

Question

较大n已经用了long long int 还是不对，应该改成什么样？

Answer 1

没必要存储真实的累加和，仅需存储3的余数。

#include <stdio.h>

int main(int argc, char* argv[]) {
  int n,i,s;
  int a, b, f;
  scanf("%d", &n);
  a = 7%3;
  b = 11%3;
  if (n == 0)
    s = 1;
  else
    s = 0;
  for (i = 2; i <= n; i++)
  {
    f = (a + b) % 3;
    a = b;
    b = f;
    s = (s + f) % 3;
  }
  if (s)
    printf("no");
  else
    printf("yes");
}