prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -c main.cpp
main.cpp: In function 'int main()':
main.cpp:86:45: warning: 'endvertex' may be used uninitialized in this function [-Wmaybe-uninitialized]
         endvertex->undirectednb.emplace_back(pair<node *, int>(startvertex, weight));
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
main.cpp:83:51: warning: 'startvertex' may be used uninitialized in this function [-Wmaybe-uninitialized]
         startvertex->directedneighbor.emplace_back(pair<node *, int>(endvertex, weight));
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully