Compilare: user.cpp: In function ‘int main()’: user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();i++) ^ user.cpp:21:9: warning: unused variable ‘Ctp’ [-Wunused-variable] int Ctp=0,contor=0,Ctn=0; ^ user.cpp:21:24: warning: unused variable ‘Ctn’ [-Wunused-variable] int Ctp=0,contor=0,Ctn=0; ^ user.cpp:26:12: warning: array subscript is above array bounds [-Warray-bounds] S[1][i]=m; ^