Compilare: user.cpp: In function ‘int main()’: user.cpp:37:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++f1[ch]; ^ user.cpp:45:11: warning: array subscript has type ‘char’ [-Wchar-subscripts] pos[ch].push_back(n); ^ user.cpp:46:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++f2[ch]; ^ user.cpp:59:23: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[i] = pos[s1[i]][last[s1[i]]++]; ^ user.cpp:59:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] p[i] = pos[s1[i]][last[s1[i]]++]; ^