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java-interview-lab/stack-queue/output/09-operation-counts.txt
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Operation counts (counted, not timed)
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nextGreater on a strictly decreasing array (the worst case for the scan-right version)
n scan-right compares stack compares stack push+pop
1000 499500 999 1000
10000 49995000 9999 10000
100000 4999950000 99999 100000
nextGreater on random values (n = 100000): every index is pushed once and popped at most once
pushes = 100000, pops = 99985, comparisons = 199977 (bound: comparisons <= 2n = 200000)
QueueViaStacks: n enqueues followed by n dequeues
n total element moves moves in the 1st dequeue
1000 1000 1000
10000 10000 10000
100000 100000 100000
one dequeue can cost n moves, but each element moves exactly once, so n enqueues + n dequeues cost 3n steps in all
StackViaQueue: n pushes
n total rotations n(n-1)/2
100 4950 4950
1000 499500 499500
5000 12497500 12497500