Compilare: user.cpp: In function ‘void read()’: user.cpp:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp: In function ‘void bfs_drake()’: user.cpp:59: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int bfs_savage(int)’: user.cpp:84: warning: comparison between signed and unsigned integer expressions