Careercup - Google面试题 - 5085331422445568

2014-05-08 23:45

题目链接

原题：

How would you use Dijkstra's algorithm to solve travel salesman problem, which is to find a shortest path from a starting node back to the starting node and visits all other node exactly once.

题目：如何用Dijkstra算法来解决TSP问题？(谁会出这种题，这又是“Guy”从哪儿copy来的？)

解法：对于这种问题我不知道该说什么。一个多项式级别的算法来解决NP问题，这已经超出了面试题或者教科书的范畴吧？这个“Guy”自己写的代码都够呛，还能问别人这种问题，实在让人无力吐槽。Dijkstra算法用于解决单源最短路径问题，而且要求没有负权的边。就算是用其他算法来近似最优解，也应该用类似最小生成树的算法吧。所以我觉得这个“Guy”应该被永久禁止发帖，完全是在误导我们这些辛辛苦苦做面试题的人。找个工作容易吗？

代码：

 // http://www.careercup.com/question?id=5085331422445568
 // Answer:
 //    Dijkstra Algorithm is not for TSP, why would you expect to solve NP-hard problems with O(n ^ 2) efforts?
 // Comment:
 //    1. Difficult question.
 //    2. Vague description.
 //    3. Strange indication.
 //    4. Stupid discussion.
 // Based on the judgement above, I believe that 'guy' is a complete amateur. Excellent programmers don't ask stupid questions, but he did.
 // The reason I'm complaining is that, he pretended to have google interview experience and posted a lot of fake questions only to trick us.
 // He doesn't even know how to calculate the distance between two points?
 // He doesn't know what volatile means.
 // He keeps asking stupid questions.
 // SO HOW THE HELL DOES THIS 'GUY' HAVE SO MANY GOOGLE INTERVIEWS?
 // He's site reliability engineer at Boeing, really?
 // I hate liars, especially foolish liars!
 // Down vote for every question he posted.
 int main()
 {
     return ;
 }