In a heap with n elements with the smallest element at the root, the 7^th smallest element can be found in time

Consider any array representation of an n element binary heap where the elements are stored from index 1 to index n of the array. For the element stored at index i of the array $$\left( {i \le n} \right)$$, the index of the parent is

The number of articulation points of the following graph is

Suppose we want to arrange the n numbers stored in any array such that all negative values occur before all positive ones. Minimum number of exchanges required in the worst case is