Compilare: user.cpp: In function ‘int main()’: user.cpp:17:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); ++i) ^ user.cpp:19:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] viz[s[i]] = 0; ^ user.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); ++i) ^ user.cpp:23:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] viz[s[i]]++; ^ user.cpp:24:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[i] = viz[s[i]]; ^ user.cpp:25:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[s[i] - 'a'][i] = viz[s[i]]; ^ user.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); ++i) ^ user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(!ok and i < s.size()) ^ user.cpp:27:38: warning: unused variable ‘m’ [-Wunused-variable] int maxim = 1, minim = 1, k = 0, m; ^