modified:   ../4_assign/binnode.h
	modified:   ../4_assign/bintree.cpp
	modified:   ../4_assign/main.cpp
	modified:   ../4_assign/node.h
	modified:   ../4_assign/stack.cpp
	new file:   main.cpp
	new file:   main.o
	new file:   rbnode.cpp
	new file:   rbnode.h
	new file:   rbnode.o
	new file:   rbtree.cpp
	new file:   rbtree.h
	new file:   rbtree.o
	new file:   redblack