Compilare: user.cpp: In function ‘void DFS(int)’: user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void Del(int, int)’: user.cpp:44:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void Update(int, int, int)’: user.cpp:52:11: warning: unused variable ‘tx’ [-Wunused-variable] { int i,tx,aux=y,nr=0,cmx=-inf,n1,n2; ^ user.cpp:76:30: warning: ‘n2’ may be used uninitialized in this function [-Wmaybe-uninitialized] Del(n1,n2); Del(n2,n1); ^ user.cpp:76:30: warning: ‘n1’ may be used uninitialized in this function [-Wmaybe-uninitialized]