Compilare: user.c: In function ‘main’: user.c:75:7: warning: array subscript has type ‘char’ [-Wchar-subscripts] adj[val[i][j]][freq[val[i][j]]++] = make(j, i); ^ user.c:71:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%hd", &N); ^ user.c:74:13: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%hd", &val[i][j]); ^ user.c:96:10: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("biperm.out", "w", stdout); ^