Compilare: user.cpp: In function ‘bool get(char*, int, int&, int)’: user.cpp:23:35: warning: array subscript has type ‘char’ [-Wchar-subscripts] return (conf & (1 << id[ch])) > 0; ^ user.cpp:29:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:63:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:66:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s " ,a + 1); ^ user.cpp:67:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%s " ,b + 1); ^