面试题：Write a function to find the middle node of a single link list.

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面试题：Suppose we have N companies, and we want to eventually merge them into one big company. How many ways are there to merge ？

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面试题：Given an array, i) find the longest continuous increasing subsequence. ii) find the longest increasing subsequence.

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面试题：Given a set of coin denominators, find the minimum number of coins to give a certain amount of change.

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面试题：Design a stack. We want to push, pop, and also, retrieve the minimum element in constant time.

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面试题：Write a program for displaying the ten most frequent words in a file such that your program should be efficient in all complexity measures.

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面试题：Given a file of 4 billion 32-bit integers, how to find one that appears at least twice ？

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面试题：Suppose you have given N companies, and we want to eventually merge them into one big company. How many ways are theres to merge ？

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面试题：You are given a small sorted list of numbers, and a very very long sorted list of numbers – so long that it had to be put on a disk in different blocks. How would you find those short list numbers in the bigger one ？

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面试题：Given a binary tree, programmatically you need to pro 1000 ve it is a binary search tree.

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