
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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C++ collections stack queue STL
stack
Write a function named collapse that takes a reference to a stack of integers as a parameter and that
collapses it by replacing each successive pair of integers with the sum of the pair. For example, suppose a
stack stores these values (shown from bottom → top):
{7, 2, 8, 9, 4, 13, 7, 1, 9, 10}
The first pair should be collapsed into 9 (7 + 2), the second pair should be collapsed into 17 (8 + 9), the third
pair should be collapsed into 17 (4+ 13) and so on to yield:
{9, 17, 17, 8, 19}
If the stack stores an odd number of elements, the final element is not collapsed. For example, the stack:
{1, 2, 3, 4, 5}
would collapse into:
{3, 7, 5}
With the 5 at the top of the stack unchanged. You may use one stack or queue as auxiliary storage.
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