题目中仅说要sort the permutation，并没有说明是升序还是降序（虽然并没有卡考虑降序的code）
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Discussion #2146 for Problem #7937. Fast XORting
Type: General Discussion
Status: Open
Posted by: LeonhardEuler
Posted at: 2026-07-21 15:00:44
Last updated: 2026-07-21 15:04:00
题目歧义
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