File list (Check if you may need any files):
Data Structure
..............\huffman tree
..............\............\a1.c
..............\............\a2.c
..............\............\a3.c
..............\............\H1.H
..............\............\huffman.cpp
..............\............\huffman.h
..............\合并链表
..............\........\Cpp1.cpp
..............\表达式求值
..............\..........\exp.cpp
..............\..........\sop.h
..............\..........\stack.h
..............\..........\stack2.h