class Solution {

    public:

        bool VerifySquenceOfBST(vector<int> v) {

            int length=v.size();

            if(length==)

                return false;

            int i=;

            --length;

            while(v[i++]<v[length]);

            while(v[i++]>v[length]);

            if(i<length)

                return false;

            cout<<i<<" "<<length<<endl;

            return true;

        }

};