一个问题如果在计算机上可以快速解决,那么它属于P类问题;如果一个解可以快速验证,那么它属于NP类问题。
The past is a place of reference, not a place of residence.
When you lend somthing pretend you are gifting. If it is returned, you'll be surprised and happy
In business, if you're not moving forward, you're falling behind.