Compilare: user.cpp: In function ‘void read_and_solve()’: user.cpp:55: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:56: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:60: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:62: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:65: 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:51: warning: control reaches end of non-void function user.cpp: In function ‘int caut_unu(int, int, int)’: user.cpp:40: warning: control reaches end of non-void function user.cpp: In function ‘int caut_zero(int, int, int)’: user.cpp:25: warning: control reaches end of non-void function