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组合数学就像是不用实际计数的计数艺术。
Combinatorics is like the art of counting without actually counting.
你必须做你认为自己做不到的事。
Be the change you wish to see in the world.
You can have a lifetime of trying to get away from where you started out, and it’s only when you get there you realize you’ve brought it with you.
写作是唯一一件当我做它时,不会觉得我应该在做其他事情的事情。
我们要做就做最好的,否则就不做。