POJ-2299 ultra-quicksort

Source: Internet
Author: User
The essence of the question is to find the number of reverse orders of a sequence, and to find the number of reverse orders with the merge order. Details AlgorithmIf you don't want to talk about it, You can Google a lot. Note Stack Overflow only when submitting poj:
The maximum number of 500001-1 entries in the sequence is-1, so we need to use the array int A [] to save it. But be careful. This array cannot be defined in the main function and must be made a global variable.

Can refer to a netizen's answer: http://www.slyar.com/blog/poj-2299-c.html

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