Compilare: user.cpp: In function 'void df1(int)': user.cpp:25: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void df2(int, int)': user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void tare_conexe()': user.cpp:55: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void s_topologica()': user.cpp:89: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void df(int, int)': user.cpp:111: warning: comparison between signed and unsigned integer expressions user.cpp:121: warning: comparison between signed and unsigned integer expressions