prepare (1/3): 
finished

make (2/3): 
g++ -Wall -std=c++11 -O2 -o main main.cpp
main.cpp: In function 'int main()':
main.cpp:146:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if (my_list.size() == node_num)
      ~~~~~~~~~~~~~~~^~~~~~~~~~~
finished

clean (3/3): 
finished

all task finished, build successfully