#include using namespace std; using Int = long long; template inline void chmin(T1 &a,T2 b){if(a>b) a=b;} template inline void chmax(T1 &a,T2 b){if(a void drop(const T &x){cout<>n; vector as(n); for(Int i=0;i>as[i]; if(as.front()>as.back()) drop("No"); vector ans; stack ss; for(Int i=n-1;i>0;i--){ if(as[i]>as[0]) ss.emplace(as[i]); else ans.emplace_back(as[i]); } while(!ss.empty()){ ans.emplace_back(ss.top()); ss.pop(); } cout<<"Yes"<