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Problem 1003
题意
byz
| 2015-09-19 19:49:39
Author
读入的字符串是一对括号()算不算合法?
admin
| 2015-09-19 19:52:32
# 1
规则1中,"类型、括号只会出现在这种规则里"
admin
| 2015-09-19 19:53:23
# 2
……规则第一条:类型、括号只会出现在这种规则里,只能他们一起出现。
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