Compilare: user.cpp: In function ‘void bfs(int, int, int, int, int)’: user.cpp:28: warning: comparison between signed and unsigned integer expressions user.cpp:50: warning: suggest parentheses around arithmetic in operand of ‘^’ user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:69: warning: suggest parentheses around arithmetic in operand of ‘^’