priority queue data structure Elements are stored in an array, which grows dynamically in size as new elements are added to the queue. The ordering is done through a pointer comparison function. The array is organized as follows. The root element (that is the "best" element \( r \) with \( r \leq x \) for all \( x \) ) is stored in position 0. The children of an element at position \( p \) are stored at positions \( q_1 = 2*p+1 \) and \( q_2 = 2*p+2 \) . That means, the parent of the element at position \( q \) is at position \( p = (q-1)/2 \) . At any time, the condition holds that \( p \leq q \) for each parent \( p \) and its children \( q \) . Insertion and removal of single elements needs time \( O(log n) \) .
Definition at line 78 of file struct_misc.h.