旅行推销员问题是一个最受人喜爱的数学难题：如果一个推销员不得不访问几个城市，怎样走最短的路线使他一次到达这几个城市。
The traveling salesman problem is a favorite math conundrum: if a salesman has to visit a bunch of cities, how do you get him to all of them once via the shortest possible route.
他是一个身着笔挺西装的精明版威利·罗曼（著名悲剧《推销员之死》中的男主角），觉着自己的玩世不恭足可以抵御一切未知的伤害。
A savvy Willy Loman in a sharp suit, this man will assume his cynicism is armour enough against the unknown.
永利是一个很能忽悠的推销员。但是10年前，即使是他也不可能免费派发素肉(seitan)。
Wynn's a convincing salesman, but a decade ago even he couldn't have given away free seitan.
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