Compilare: user.cpp: In function ‘void d(int)’: user.cpp:19:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[nod].size();i++) ^ user.cpp: In function ‘void d2(int)’: user.cpp:30:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[nod].size();i++) ^ user.cpp: In function ‘void bfs(int)’: user.cpp:45:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[a].size();i++) ^ user.cpp: In function ‘void bfs2(int)’: user.cpp:65:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gr[a].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:80:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b; ^