Compilare: user.cpp: In function ‘void read_and_solve()’: user.cpp:49: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:50: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘int caut_doi(int, int, int)’: user.cpp:45: warning: control reaches end of non-void function user.cpp: In function ‘int caut_unu(int, int, int)’: user.cpp:34: warning: control reaches end of non-void function user.cpp: In function ‘int caut_zero(int, int, int)’: user.cpp:23: warning: control reaches end of non-void function