文件名称:cow
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设有一头小母牛，从出生第四年起每年生一头小母牛，
按此规律，第N年时有几头母牛？-Has a small cow, from birth each year, starting the fourth year in a Heifer Health, here the law, the first N years, a few cows from time to time?
按此规律，第N年时有几头母牛？-Has a small cow, from birth each year, starting the fourth year in a Heifer Health, here the law, the first N years, a few cows from time to time?
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下载文件列表
母牛问题（递归）.txt