母牛的故事 （C语言代码）

#include<stdio.h>

/*

*初中生一个，想了一天才想出来这道题 

*全部是自己的思路，没有看题解 

*/ 

int main(void)

{

    long cows = 1;

    long add[3] = {0};

    long s_cows = 0;

    long year;

    long now = 0;

    long i = 1;

    scanf("%d",&year);

    add[0] = 1;

    year--;

    while (year > 0)

    {

        while (now < year )

            {

                add[now % 3] = cows;

                cows += add[i % 3];

                s_cows += add[now % 3];

                s_cows -= add[i % 3 ];

                i++;

                now++;

            }

        if (year != 0)

        printf("%d\n",cows + s_cows);

        now = 0;

        cows = 1;

        add[0] = 1;

        add[1] = 0;

        add[2] = 0;

        s_cows = 0;

        i = 1;

        scanf("%d",&year);

        year--;

    }

    return 0;

}