Compilare: user.cpp: In function ‘int main()’: user.cpp:27:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[c[u]].size();i++) ^ user.cpp:50:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[c[u]].size();i++) ^ user.cpp:10:14: warning: unused variable ‘x’ [-Wunused-variable] {int u,p,i,n,x,m,a,b,j,d,last; ^ user.cpp:10:16: warning: unused variable ‘m’ [-Wunused-variable] {int u,p,i,n,x,m,a,b,j,d,last; ^ user.cpp:47:17: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] cont[last]=1; ^ user.cpp:64:6: warning: ‘d’ may be used uninitialized in this function [-Wmaybe-uninitialized] out<<d<<'\n'; ^