我理解是每个数字出现的次数是双数。也许我理解错啦？

来源: 浅水鱼于 2024-12-18 15:35:45 [旧帖] [给我悄悄话] 本文已被阅读：次

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我理解是每个数字出现的次数是双数。 也许我理解错啦？