Compilare: user.cpp: In function ‘int main()’: user.cpp:26:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[s[i]] = max(a[s[i]], b[j] + 1); ^ user.cpp:26:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] a[s[i]] = max(a[s[i]], b[j] + 1); ^ user.cpp:29:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[s[i]] = max(b[s[i]], a[j] + 1); ^ user.cpp:29:27: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[s[i]] = max(b[s[i]], a[j] + 1); ^ user.cpp:18:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%s", s); ^