Struct_chapter3_Tree
3.1 tree and the expression of tree
- concept of tree
an excellent struct to expresses hierarchical relationship(层次关系) - more efficienct
-
Searching
- 0x01 static searching
notice
: 哨兵(tag)
two probable status to exit :
1.find K in list(return index)
2.no K except the station of tag(return 0)
3.时间复杂度o(n) [n/2]
- 0x02 binary search(二分查找)
- 不可采用chain list [one-way]
status 1 find correct answer
status 2 no correct answer
realization and enlightenment
thought bubble : optimize
黄金分割查找?
在二分查找中,我们是取mid等于left和right的中间值,即用等分的方法进行查找。
那为什么一定要等分呐?能不能进行“黄金分割”?也就是mid=left+0.618(right-left),当然mid要取整数。如果这样查找,时间复杂性是多少?也许你还可以编程做个试验,比较一下二分法和“黄金分割”法的执行效率。
- dynamic searching