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Problem 4354 >> 平面式魔方 搜到了这个
save_code @ 2019-01-10 15:02:51
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https://wenku.baidu.com/view/48c40d5217fc700abb68a98271fe910ef02dae1e.html

可惜需要一个下载券
save_code @ 2019-01-10 16:24:52
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有解判定 太没有意思了, 应该改成找一组可行解, 就一个逆序对的判定,有啥意思。。。
save_code @ 2019-01-10 16:26:16
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N为 奇数的时候 存在偶数逆序对就是Yes N为偶数的时候Yes恒成立
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