类似于 stdlib bsearch 的东西，立即返回较小的元素
是否有类似于内置的 bsearch 的东西，如果相同的元素不存在，则返回立即较小的元素，并且仅当该元素已经小于所有其他元素时才返回 NULL。这将要求用户检查返回值的键是否与函数参数相同，但它本身就非常有用。 谢谢。
Is there something similar to bsearch built in, that returns the immediately smaller element if the same element is not present and NULL only if the element is already smaller than all other elements. This would require the user to check if the return value's key is same as the function argument, but it would be very useful in its own right.
Thanks.
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它并不以你想要的方式存在。您需要实施它。
It doesn't exist the way you want it. You would need to implement it.
据我所知，标准库中没有这样的函数。但自己完成这项工作或找到图书馆应该不会太难。
As far as I can say there is no such function in the standard library. But it should not be to hard to do this on your own or find a library.