prepare (1/3): 
finished

make (2/3): 
g++ -g -Wall -O2 -o main.o -c main.cpp 
main.cpp: In function 'int main(int, char**)':
main.cpp:115:28: warning: 'PQ' may be used uninitialized in this function [-Wmaybe-uninitialized]
                 PQ->enqueue(*N);
                 ~~~~~~~~~~~^~~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully