Compilare: user.cpp: In function ‘int main()’: user.cpp:48:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "transport.in" , "r" , stdin ) ; ^ user.cpp:49:48: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ( "transport.out" , "w" , stdout ) ; ^ user.cpp:50:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d%d" , &n , &k ) ; ^ user.cpp:53:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ( "%d" , &v[i] ) ; ^ user.cpp: In function ‘int cb(int, int, int, int)’: user.cpp:42:12: warning: ‘rez’ may be used uninitialized in this function [-Wmaybe-uninitialized] return rez ; ^