Compilare: user.cpp: In function 'void dijkstra()': user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int flow()': user.cpp:76: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void df(int)': user.cpp:120: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:158: warning: comparison between signed and unsigned integer expressions