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:80:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i <current_node.neighbour.size() ; ++i) {
                         ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:158:13: warning: unused variable 'i2' [-Wunused-variable]
         int i2 = weights;
             ^~
main.cpp:159:13: warning: unused variable 'i3' [-Wunused-variable]
         int i3 = weights;
             ^~
main.cpp:99:9: warning: variable 'final' set but not used [-Wunused-but-set-variable]
     int final, f_pre, f_link;
         ^~~~~
main.cpp:105:9: warning: unused variable 'i1' [-Wunused-variable]
     int i1 = weights;
         ^~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully