Compilare: user.cpp: In function ‘int main()’: user.cpp:36:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(s[j].find(aux)==-1) ^ user.cpp:31:17: warning: unused variable ‘xx’ [-Wunused-variable] int xx; //cin>>xx; ^ user.cpp:25:17: warning: unused variable ‘k1’ [-Wunused-variable] int i,j,k1,k2; ^ user.cpp:25:20: warning: unused variable ‘k2’ [-Wunused-variable] int i,j,k1,k2; ^ user.cpp:13:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^