Compilare: user.cpp: In function ‘void Del(int, int)’: user.cpp:14:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp:13:10: warning: unused variable ‘j’ [-Wunused-variable] { int i,j; ^ user.cpp: In function ‘void BFS()’: user.cpp:31:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void Euler(int)’: user.cpp:41:7: warning: unused variable ‘i’ [-Wunused-variable] { int i,y; ^ user.cpp: In function ‘int main()’: user.cpp:52:9: warning: unused variable ‘j’ [-Wunused-variable] { int i,j,x,y; ^