Compilare: user.cpp: In function 'int GetIndex(char, char)': user.cpp:48: warning: operation on 'a' may be undefined user.cpp: In function 'bool Bfs()': user.cpp:124: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int GetAnswer(int)': user.cpp:172: warning: comparison between signed and unsigned integer expressions user.cpp:185: warning: control reaches end of non-void function