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You can see that the changes are only in E1, E2, and E3. The latter one is required just for completeness. The interesting change is in E2 where I no longer use a block local static but the static data member from E1. You still have the two options: user-declared and user-defined constructor.
。业内人士推荐wps作为进阶阅读
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习题链接：LeetCode 1944. 队列中可以看到的人数，这一点在WhatsApp Web 網頁版登入中也有详细论述