Compilare: user.cpp: In function ‘void fa_lant(int)’: user.cpp:62:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ls[X].size(); i++) ^ user.cpp:80:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ls[x].size(); i++) ^ user.cpp:49:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.cpp: In function ‘int main()’: user.cpp:129:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < ls[a3[i]].size(); j++) ^