cppreference.com > C++ Algorithms > push_heap push_heap Syntax:
      #include <algorithm>
      void push_heap( iterator start, iterator end );
      void push_heap( iterator start, iterator end, StrictWeakOrdering cmp );
The push_heap() function adds an element (defined as the last element before end) to a heap (defined as the range of elements between [start,''end-1). If the strict weak ordering comparison function object cmp is given, then it is used instead of the < operator to compare elements. push_heap() runs in logarithmic time. Related topics: is_heap make_heap pop_heap sort_heap