多项式时间归约的概念对于理解NP完全问题的结构至关重要。
"Sometimes I think that the only thing that connects us to the past is the present. Without the present, the past would be lost forever."
好的插画不只是伴随文字 - 它与文字对话。
That's one small step for (a) man, one giant leap for mankind.