prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -std=c++11 -o main.o -c main.cpp 
g++ -g -Wall -O2 -std=c++11 -o market.o -c market.cpp 
g++ -g -Wall -O2 -std=c++11 -o main main.o market.o
finished

clean (3/3): 
finished

all task finished, build successfully