Compilare: user.cpp: In function ‘int main()’: user.cpp:30:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] vfa[A[n]]++; ^ user.cpp:37:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] vfb[B[m]]++; ^ user.cpp:51:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(vfb[A[i]]){ ^ user.cpp:52:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(ist>=0&&vfa[ans[ist]]&&A[i]<ans[ist]){ ^ user.cpp:53:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] vfa[ans[ist]]--; ^ user.cpp:54:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] vfb[ans[ist]]++; ^ user.cpp:58:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] vfb[A[i]]--; ^ user.cpp:61:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] vfa[A[i]]--; ^ user.cpp: In function ‘char nextch()’: user.cpp:12:31: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf,1,MAXBUF,fi); ^