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Problem B: BTime Limit: 1 SecMemory Limit: 128 MBSubmit: 96Solved: 43[Submit][Status][Web Board]DescriptionNow that you're back to school for another term, you need to remember how to work the combination lock on your locker. A common design is that of the Master Brand, shown at right. The lock 阅读全文
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Problem F: FTime Limit: 1 SecMemory Limit: 128 MBSubmit: 221Solved: 56[Submit][Status][Web Board]DescriptionSuperbowl Sunday is nearly here. In order to pass the time waiting for the half-time commercials and wardrobe malfunctions, the local hackers have organized a betting pool on the game. Members 阅读全文
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正则表达式 匹配中文字符的正则表达式： [u4e00-u9fa5] 评注：匹配中文还真是个头疼的事，有了这个表达式就好办了 匹配双字节字符(包括汉字在内)：[^x00-xff] 评注：可以用来计算字符串的长度（一个双字节字符长度计2，ASCII字符计1） 匹配空白行的正则表达式：ns*r 评注：可以用来删除空白行 匹配HTML标记的正则表达式：< (S*?)[^>]*>.*?|< .*? /> 评注：网上流传的版本太糟糕，上面这个也仅仅能匹配部分，对于复杂的嵌套标记依旧无能为力 匹配首尾空白字符的正则表达式：^s*|s*$ 评注：可以用来删除行首行尾的空白字符(包 阅读全文