Compilare: user.cpp: In function ‘int bfs()’: user.cpp:28:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) { ^ user.cpp: In function ‘int main()’: user.cpp:68:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) { ^ user.cpp:41:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,z,p,u,minx; ^ user.cpp:41:19: warning: unused variable ‘p’ [-Wunused-variable] int i,j,x,y,z,p,u,minx; ^ user.cpp:41:21: warning: unused variable ‘u’ [-Wunused-variable] int i,j,x,y,z,p,u,minx; ^