add divide and conquer to makefile

Makefile

@@ -1,7 +1,7 @@
 CC=gcc
 CFLAGS=-Wall -Isrc/include -DDEBUG -g
 LDFLAGS=-lm
-SRC=src/points.c src/timer.c src/read_file.c src/distance.c src/brute_force.c
+SRC=src/points.c src/timer.c src/read_file.c src/distance.c src/brute_force.c src/divide_and_conquer.c
 OBJ=$(SRC:.c=.o)
 
 all: points informe