Compilare: user.cpp: In function ‘void read()’: user.cpp:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void Query(int, int, int)’: user.cpp:53: warning: unused variable ‘nodright’ user.cpp: In function ‘void write()’: user.cpp:127: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long int’