Compilare: user.cpp: In function ‘int edge(int, int)’: user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:52: warning: comparison between signed and unsigned integer expressions user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp:73: warning: comparison between signed and unsigned integer expressions user.cpp:76: warning: comparison between signed and unsigned integer expressions user.cpp:48: warning: unused variable ‘nod4’