Doing this "in one pass" sounds easy, but this can cause your
The semantics around releasing locks with pending reads were also unclear for years. If you called read() but didn't await it, then called releaseLock(), what happened? The spec was recently clarified to cancel pending reads on lock release — but implementations varied, and code that relied on the previous unspecified behavior can break.，更多细节参见同城约会
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* LeetCode 739. 每日温度