Compilare: user.cpp: In function ‘int main()’: user.cpp:29:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(vis[str[j]] == 0) { ^ user.cpp:30:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] vis[str[j]] = 1; ^ user.cpp:31:31: warning: array subscript has type ‘char’ [-Wchar-subscripts] cst[str[j]]++; ^ user.cpp:16:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s " ,str + 1); ^