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:229:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 1; i < e.size(); i++)
               ~~^~~~~~~~~~
main.cpp:231:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (i = 1; i < f.size(); i++)
               ~~^~~~~~~~~~
main.cpp:426:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (ttt_it=0;ttt_it!=ttt.size();ttt_it++)  
                 ~~~~~~^~~~~~~~~~~~
g++ -g -Wall -O2 -o main main.o
finished

clean (3/3): 
finished

all task finished, build successfully