第2章
search in a range： 找的是2分法分别查找first position and last position
做lintcode上binary search的题
search insert position
解释find K-th element里为何返回无穷大
rotated sorted array里如何找分割点，lgn
3步翻转： recover sorted array, rotate string, reverse words in a string(2步)
merge sort a linked list
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第3章
partition array
merge sort, quick sort
lowest common ancestor
bfs, 3种方法
validate bfs，用divide and conquer
implement iterator for bfs(stack)
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第4章
sort list,可以用 partition list(from quick sort)
copy list with random pointer
convert sorted list to bst, bottom up
非递归考点： pre, in, post order tree traversal, permutation, subset
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第5章
Read full article from Leetcode: Note: 九章算法
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