#include #include #include using namespace std; int a[100010]; int main(){ int i,n; cin >> n; for(i=0;i> a[i]; } if(a[0]>a[n - 1]){ cout << "No" << endl; return 0; } cout << "Yes" << endl; int mx = -1; vector v,u; for(i=n - 1;i>=1;i--){ mx = max(mx,a[i]); if(a[i]