#include #include using namespace std; using namespace atcoder; typedef long long ll; typedef pair P; typedef modint1000000007 mint; #define rep(i,a,b) for(ll i=a;i=b;i--) const ll inf=1e18; ll n; ll a[100005]; int main(void){ cin.tie(0); ios::sync_with_stdio(0); cin>>n; rep(i,0,n){ cin>>a[i]; } if(a[0]>a[n-1]){ cout<<"No"<a[0]){ cout<