Compilare: user.cpp: In function ‘int main()’: user.cpp:23:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] q[s[i]]=i+'a'; ^ user.cpp:31:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] k[j]=q[s[j]]; q1[k[j]]=s[j]; ^ user.cpp:31:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] k[j]=q[s[j]]; q1[k[j]]=s[j]; ^ user.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v.size();i++) ^ user.cpp:38:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[i].length();j++) ^ user.cpp:40:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] g<<q1[v[i][j]]; ^