10.
Swaps and Inversions
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3588 Accepted Submission(s): 976Time Limit: 2
阅读背景：
求逆序对：归并/离散化+树状数组 7.25杭电多校赛 J
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