https://www.acwing.com/problem/content/872/
数据范围太大，数组存不下，所有用哈希表来存
https://www.acwing.com/problem/content/4320/
用哈希表判重
[https://www.acwing.com/activity/content/problem/content/6822/](https://)
希冀
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2022-03-25 15:30:45
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所有人可见
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https://www.acwing.com/problem/content/872/
数据范围太大，数组存不下，所有用哈希表来存
https://www.acwing.com/problem/content/4320/
用哈希表判重
[https://www.acwing.com/activity/content/problem/content/6822/](https://)
