#include using namespace std; typedef signed long long ll; #undef _P #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 ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++) #define ALL(a) (a.begin()),(a.end()) #define ZERO(a) memset(a,0,sizeof(a)) #define MINUS(a) memset(a,0xff,sizeof(a)) //------------------------------------------------------- template class SegTree_1 { public: vector val; static V const def=0; V comp(V l,V r){ return min(1LL<<30,l*r);}; SegTree_1(){val=vector(NV*2,1);}; V getval(int x,int y,int l=0,int r=NV,int k=1) { // x<=i1) entry>>=1, val[entry]=comp(val[entry*2],val[entry*2+1]); } }; int N; ll A[101010]; ll B[101010]; ll C[101010]; const ll mo=1000000007; 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; } SegTree_1 st; void solve() { int i,j,k,l,r,x,y; string s; cin>>N; FOR(i,N) { cin>>A[i]; if(A[i]==0) return _P("0\n"); st.update(i,A[i]); } FOR(i,N) { x=i+1; for(j=20;j>=0;j--) { y=x+(1<N) continue; if(st.getval(i,y)<1000000000) x=y; } j=x-i; B[i]+=j; C[i]++; C[i+j]--; } ll cur=0; int dec=0; ll ret=1; FOR(i,N) { cur+=B[i]; dec+=C[i]; ret=ret*modpow(A[i],cur)%mo; cur-=dec; } cout<