prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
In file included from main.cpp:13:0:
traveler.h: In member function 'void traveler::enOrder(const order&)':
traveler.h:44:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if(it->buyPrice<o1.price){
          ~~~~~~~~~~~~^~~~~~~~~
In file included from main.cpp:11:0:
order_book.h: In member function 'unsigned int order_book::getMedian() const':
order_book.h:183:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully