The concept of polynomial-time reduction is central to understanding the structure of NP-complete problems.
你可以成为任何你想成为的人,只要把自己变成你认为永远不可能成为的样子。
Sir, where are you running? Are you doing this for world peace? Are you doing this for the homeless? Are you running for women's rights? The environment? They just couldn't believe that somebody would do all that running for no particular reason. Why are you doing this? I just felt like running. I just felt like running.