Compilare: user.cpp: In function ‘int main()’: user.cpp:32:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] l=(-sgn[v[x].dir])*nivx-v[x].vol/2; ^ user.cpp:33:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] r=(-sgn[v[x].dir])*nivx+v[x].vol/2; ^ user.cpp:35:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] l+=sgn[v[i].dir]*v[i].vol/2; ^ user.cpp:36:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] r+=sgn[v[i].dir]*v[i].vol/2; ^ user.cpp:20:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &n); ^ user.cpp:23:49: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %c", &v[i].vol, &v[i].dir); ^ user.cpp:26:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^