Compilare: user.cpp: In function ‘void read()’: user.cpp:19: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:21: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void write()’: user.cpp:63: warning: format ‘%d’ expects type ‘int’, but argument 3 has type ‘long long int’ user.cpp: In function ‘int bs(int, int, int)’: user.cpp:30: warning: ‘pos’ may be used uninitialized in this function