Compilare: user.cpp: In function ‘int main()’: user.cpp:40:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ; j < edges.size() ; ++ j) ^ user.cpp:64:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i + 1 < cycle.size() ; ++ i) ^