Compilare: user.cpp: In function ‘void MakeMatrix()’: user.cpp:17:23: warning: unused variable ‘j’ [-Wunused-variable] int index_cod=0,i,j,putere2=1; ^ user.cpp: In function ‘int main()’: user.cpp:79:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a.size();i++) ^ user.cpp:88:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<b.size();j++) ^ user.cpp:104:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b.size();i++) ^