prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int main()':
main.cpp:73:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i <current_node.neighbour.size() ; ++i) {
                         ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully