Compilare: user.cpp: In function ‘void bkt(int)’: user.cpp:21:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++f[*it]; ^ user.cpp:24:26: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f[*it2] == 0) ^ user.cpp:26:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] mn = min(mn, f[*it2]); ^ user.cpp:27:36: warning: array subscript has type ‘char’ [-Wchar-subscripts] mx = max(mx, f[*it2]); ^ user.cpp:34:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] --f[*it]; ^ user.cpp: In function ‘int main()’: user.cpp:55:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++f[ch[i]]; ^ user.cpp:56:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] mn = min(mn, f[ch[i]]); ^ user.cpp:57:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] mx = max(mx, f[ch[i]]); ^ user.cpp:73:34: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++f[ch[i]]; ^ user.cpp:74:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] mn = min(mn, f[ch[i]]); ^ user.cpp:75:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] mx = max(mx, f[ch[i]]); ^