摘要：
This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female students. Inp 阅读全文
摘要：
Excel can sort records according to any column. Now you are supposed to imitate this function. Input Specification: Each input file contains one test 阅读全文
摘要：
The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. A binary search tree (BST) i 阅读全文
摘要：
There is a kind of balanced binary search tree named red-black tree in the data structure. It has the following 5 properties: (1) Every node is either 阅读全文