原题链接：[递归]母牛的故事
#include<stdio.h>
int main()
{
int old = 1, new1 = 0, new2 = 0, new3 = 0, year, total;
printf("please input the year.\n");
scanf_s("%d", &year);
while (year != 0)
{
while (year > 1)
{
old = old + new3;
new3 = new2;
new2 = new1;
new1 = old;
year--;
}
total = old + new1 + new2 + new3;
printf("%d\n", total);
}
return 0;
}
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