摘要：
Given a string, you are supposed to output the length of the longest symmetric sub-string. For example, given "Is PAT&TAP symmetric?", the longest sym 阅读全文
摘要：
Indeed there are many different tourist routes from our city to Rome. You are supposed to find your clients the route with the least cost while gainin 阅读全文
摘要：
A gas station has to be built at such a location that the minimum distance between the station and any of the residential housing is as far away as po 阅读全文