Compilare: user.cpp: In function ‘int main()’: user.cpp:29:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size();i++) fr[s[i]]++; ^ user.cpp:29:49: warning: array subscript has type ‘char’ [-Wchar-subscripts] for (int i=0;i<s.size();i++) fr[s[i]]++; ^ user.cpp:39:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<s.size() && ok;i++) ^ user.cpp:40:28: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (cp[s[i]]==0 && ct[p[i]]==0) cp[s[i]]=p[i],ct[p[i]]=s[i]; ^ user.cpp:40:43: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (cp[s[i]]==0 && ct[p[i]]==0) cp[s[i]]=p[i],ct[p[i]]=s[i]; ^ user.cpp:40:56: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (cp[s[i]]==0 && ct[p[i]]==0) cp[s[i]]=p[i],ct[p[i]]=s[i]; ^ user.cpp:40:70: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (cp[s[i]]==0 && ct[p[i]]==0) cp[s[i]]=p[i],ct[p[i]]=s[i]; ^ user.cpp:41:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] else if (cp[s[i]]!=p[i]) ok=0; ^