Compilare: user.cpp: In function ‘int main()’: user.cpp:17:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<s.length(); i++) ^ user.cpp:18:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] t[s[i]].push_back(i); ^ user.cpp:26:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] int m=t[s[i]].size(); ^ user.cpp:29:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] s[t[ss[i]][j]]=q[i]; ^ user.cpp:36:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v.size(); i++) ^