Compilare: user.cpp: In function 'void bfs()': user.cpp:44: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:87: warning: array subscript has type 'char' user.cpp:87: warning: array subscript has type 'char' user.cpp:87: warning: array subscript has type 'char' user.cpp:87: warning: array subscript has type 'char' user.cpp:88: warning: array subscript has type 'char' user.cpp:88: warning: array subscript has type 'char' user.cpp:88: warning: array subscript has type 'char' user.cpp:88: warning: array subscript has type 'char'