This program illustrates the use of the STL push_heap() algorithm (extended
version) to add a value to a (minimum) heap of integers.
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Here are the values in the vector (the heap):
2 3 25 7 17 100 36 19
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Now we add the value 1 to the heap.
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Here are the revised contents of the vector:
1 2 25 3 17 100 36 19 7
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