#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define popcount __builtin_popcount using namespace std; typedef long long int ll; typedef pair P; const ll MOD=1e9+7; ll powmod(ll a, ll k){ ll ap=a, ans=1; while(k){ if(k&1){ ans*=ap; ans%=MOD; } ap=ap*ap; ap%=MOD; k>>=1; } return ans; } ll inv(ll a){ return powmod(a, MOD-2); } int main() { int n; cin>>n; ll l[100010], r[100010]; int d[100010]; for(int i=0; i>l[i]; for(int i=0; i>r[i]; for(int i=0; i>d[i]; int z=-1; for(int i=n-1; i>=0; i--){ if(d[i]==0){ z=i; break; } } for(int i=0; i=z+1; i--){ d[i]%=9; if(i) d[i]=(d[i]+9-d[i-1])%9; } ll ans=1; ll myon=inv(9); for(int i=z+1; iz+1 && d[i]==0) c++; (ans*=c)%=MOD; } cout<