compile with optimization

Makefile

-CXX=gcc
-CXXFLAGS=-Wall -pedantic
+C=gcc
+CLIB=-lm
+COPT=-O2
+CWARN=-Wno-unused-result
 SEQ=ATGCCCTATACCTATGATTATCCGCGCCCTGGTCTTACCGTTGACTGCGTGGTGTTTGGCCTAGACGAACAGATCGATCTCAAAGTCCTACTGATTCAGCGCCAGATTCCCCCTTTCCAGCATCAGTGGGCATTACCCGGAGGCTTTGTGCAGATGGATGAATCTTTAGAAGACGCGGCTCGCCGGGAGCTGCGAGAAGAAACGGGGGTTCAGGGTATTTTCCTAGAGCAGCTCTATACCTTTGGCGATTTGGGTCGAGATCCGCGCGATCGCATCATCTCCGTTGCCTACTACGCTCTAATCAACCTCATCGAATATCCTTTACAAGCCTCTACTGATGCTGAAGACGCAGCCTGGTACTCCATTGAGAATTTGCCATCTCTAGCTTTTGATCATGCTCAAATCTTGAAACAGGCCATCCGGCGATTGCAGGGCAAAGTTCGCTACGAACCGATTGGCTTCGAACTACTGCCGCAAAAATTTACACTCACCCAAATTCAGCAGCTTTACGAAACAGTTCTTGGCCATCCTCTAGATAAACGGAACTTTCGTAAGAAATTGCTAAAAATGGATCTCTTAATTCCCCTTGATGAGCAACAAACTGGAGTTGCTCATCGTGCTGCCAGACTCTATCAGTTCGACCAAAGCAAATACGAGCTATTGAAACAACAGGGATTTAACTTCGAGGTTTGA
-all:  prg
-run:  prg   ; ./prg 1 2 3 4 10 $(SEQ)
-prg:  dtw.c ; $(CXX) dtw.c -lm -o prg
-clean:      ; rm -f a.out prg *~
+IN=dtw.c
+OUT=prg
+
+all: $(OUT)
+
+run: $(OUT)
+	./$(OUT) 1 2 3 4 10 $(SEQ)
+
+$(OUT): $(IN)
+	$(C) $^ -o $@ $(CLIB) $(COPT) $(CWARN)
+
+clean:
+	rm -fv a.out $(OUT) *~

time/time_opt.txt

+time ./prg 005 %
+
+real	0m3.466s
+user	0m0.142s
+sys	0m1.471s
+
+time ./prg 010 %
+
+real	0m3.763s
+user	0m0.601s
+sys	0m1.300s
+
+time ./prg 025 %
+
+real	0m4.828s
+user	0m1.725s
+sys	0m1.240s
+
+time ./prg 050 %
+
+real	0m7.093s
+user	0m3.164s
+sys	0m1.591s
+
+time ./prg 100 %
+
+real	0m16.083s
+user	0m11.766s
+sys	0m1.572s
+