ex2: fix benchmark

exercise2/Makefile

@@ -12,16 +12,16 @@ NPROC   := 3
 
 all: clean parallel show
 
-$(TARGET): $(SRC)
+$(OUT): $(SRC)
 	$(CC) $(CFLAGS) -o $(OUT) $<
 
-run: $(TARGET)
-	cd $(OUTDIR) && ./$< $(ARGS)
+run: $(OUT)
+	cd $(OUTDIR) && ./$(TARGET) $(ARGS)
 
 clean:
 	rm -rf $(OUTDIR)/*
 
-time: $(TARGET)
+time: $(OUT)
 	python3 bench.py './$(OUT) 0' $(NBENCH)
 
 parallel: $(SRC)