Compilare: user.cpp: In function ‘int get_nr(int&)’: user.cpp:39:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void form_arb(int, int, int)’: user.cpp:74:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( p1 < Arb[nd1].size() && p2 < Arb[nd2].size() ){ ^ user.cpp:74:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( p1 < Arb[nd1].size() && p2 < Arb[nd2].size() ){ ^ user.cpp:85:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( p1 < Arb[nd1].size() ){ ^ user.cpp:89:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while( p2 < Arb[nd2].size() ){ ^