#include #include #include #include #include #include #include #include #include #include #define mkp make_pair #define mkt make_tuple #define rep(i,n) for(int i = 0; i < (n); ++i) #define all(v) v.begin(),v.end() using namespace std; typedef long long ll; const ll MOD=1e9+7; template void chmin(T &a,const T &b){if(a>b) a=b;} template void chmax(T &a,const T &b){if(a Gauss(vector> &A){//F2(xor) int N=A.size(); int M=A[0].size(); int rank=0; for(int j=0;j=0){ if(pivot!=rank){ for(int k=0;k result; for(int i=rank;i>N>>M; vector> A(M,vector (N+1,0)); rep(q,M){ int K; cin>>K; vector B(K); rep(i,K) cin>>B[i]; rep(i,K) B[i]--; int value; cin>>value; rep(i,K) A[q][B[i]]=1; A[q][N]=value; } vector ans=Gauss(A); if(ans.empty()){ cout<<-1<