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.
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