Compilare: user.cpp: In function ‘int main()’: user.cpp:23:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < w.size(); i ++) { ^ user.cpp:71:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < w.size(); i ++) { ^ user.cpp:22:9: warning: variable ‘last’ set but not used [-Wunused-but-set-variable] int last = w[0]; ^