AVL Tree implementation: I also included a test function to compare the AVL Tree performance with STL Set and Map. Compile the source mavltree.cpp and run it to see the result!-AVL Tree implementation : I also included a test to compare the fu

main函数中结构数组a中存储了5个职员的工资信息（这里称每个职员的工资信息为一条“记录”）。sift函数的形参cond接收筛选条件字符串，函数实现从s指向数组元素开始的n个元素中筛选出所有wage符合筛选条件的记录并将这些记录复制到res指向的结构数组。函数返回res数组中存储的记录数（筛选结果）。-The main function is stored in an array of structures a five staff wages (here referred to the inf