prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -o main.o -c main.cpp 
g++ -g -Wall -o quick-sort.o -c quick-sort.cpp 
g++ -g -Wall -o rselect.o -c rselect.cpp 
g++ -g -Wall -o dselect.o -c dselect.cpp 
g++ -g -Wall -o main main.o quick-sort.o rselect.o dselect.o
finished

clean (3/3): 
finished

all task finished, build successfully