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https://ptilopsisw.github.io/2022/09/10/2022-9-6%E6%80%BB%E7%BB%93/
排列 因为可以任意排列,所以我们可以想到尽量把大于 000 的数放到一起。所以我们可以先把大于 000 的全加起来,再进行一些取舍。 对于一个形如 a→b→ca \rightarrow b \rightarrow ca→b→c 的限制,也就是如果选了 a,ca,ca,c 就必须选 bbb。 如果 xb<0x_b < 0xb<0 的话,要么就选上 bbb ,要么就不选 aaa 或
The text was updated successfully, but these errors were encountered:
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https://ptilopsisw.github.io/2022/09/10/2022-9-6%E6%80%BB%E7%BB%93/
排列 因为可以任意排列,所以我们可以想到尽量把大于 000 的数放到一起。所以我们可以先把大于 000 的全加起来,再进行一些取舍。 对于一个形如 a→b→ca \rightarrow b \rightarrow ca→b→c 的限制,也就是如果选了 a,ca,ca,c 就必须选 bbb。 如果 xb<0x_b < 0xb<0 的话,要么就选上 bbb ,要么就不选 aaa 或
The text was updated successfully, but these errors were encountered: