#include using namespace std; typedef signed long long ll; #define _P(...) (void)printf(__VA_ARGS__) #define FOR(x,to) for(x=0;x<(to);x++) #define FORR(x,arr) for(auto& x:arr) #define FORR2(x,y,arr) for(auto& [x,y]:arr) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) template bool chmax(T &a, const T &b) { if(a bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;} //------------------------------------------------------- int N,M; vector G[101010]; int C[101010]; const ll mo=1000000007; ll ret[101010]; ll modpow(ll a, ll n = mo-2) { ll r=1;a%=mo; while(n) r=r*((n%2)?a:1)%mo,a=a*a%mo,n>>=1; return r; } void solve() { int i,j,k,l,r,x,y; string s; cin>>N>>M; FOR(i,N) G[i].push_back(i), C[i]=i, ret[i]=1; FOR(i,M) { cin>>x>>y; x=C[x-1]; y=C[y-1]; if(x==y) continue; if(G[x].size()==G[y].size()) { FORR(v,G[y]) { G[x].push_back(v); C[v]=x; } FORR(v,G[x]) ret[v]=ret[v]*(mo+1)/2%mo; } else { if(G[x].size()