#include <bits/stdc++.h>
using namespace std;

int main(){
  int t;cin>>t;
  while(t--){
    int n;cin>>n;
    vector<int> h(n);
    for(int i=0;i<n;i++)cin>>h[i];
    int l=0,r=0;
    for(int i=1;i<n-1;i++){
      if(h[i-1]>h[i]&&h[i]<h[i+1])l++;
      else if(h[i-1]<h[i]&&h[i]>h[i+1])r++;
    }
    cout<<(l==2&&r==1?"Yes":"No")<<endl;
  }
}