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这道题怎么用逆序对解？看到有人说求逆序对可以解这道题，于是……我这个ZZ，写了三次归并+逆序对，全部WA。 所以我就想问，求逆序对怎么破这道题……还有其中需要注意的细节也请一并附上。 万分感谢！ Followed by:
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