Compilare: user.cpp: In function 'bool BFS(int, int)': user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int flux(int, int)': user.cpp:61: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void solve()': user.cpp:85: warning: 'd' may be used uninitialized in this function