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Attention!!!因为题目指出某些字符才是一个关键字的首尾字符, A keyword "occurs" in an excuse if and only if it exists in the string in contiguous form and is delimited by the beginning or end of the line or any non-alphabetic character or a space. occurs 这个关键字如果在 occursabc 或 abcoccurs 中出现都不计算在内 一定要在 句首或 occurs首尾都是非字母字符才计算在内... 所以,大家注意了... Followed by:
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