all: list.o tree.o solution.o
    gcc -o solution list.o tree.o solution.o

list.o: list.c list.h
    gcc -c list.c

tree.o: list.c list.h tree.c tree.h
    gcc -c tree.c

solution.o: solution.c tree.c tree.h list.c list.h
    gcc -c solution.c

clean:
    rm -rf *.o solution

.PHONY: all clean