change directory names

18/1/2/Makefile

@@ -0,0 +1,16 @@
+CXX = g++-7
+CC = g++-7
+CXXFLAGS = -Wall -Wextra
+
+all: main
+
+main.o: main.cpp
+	$(CXX) $(CXXFLAGS) -c main.cpp
+
+main: main.o
+
+clean:
+	rm -f *.o *.h.gch *.exe main
+
+run: all
+	./main