Hello ladies and gents,

Chapter 3 exercise 3-1:

Suppose we wish to find the median of a collection of values. Assume that the we have read some values so far, and that we have no idea how many values remain to be read. Prove that we cannot afford to discard any of the values that we have read. Hint: One proof strategy is to assume that we can discard a value, and then find values for the unread--and therefore unknown--part of our collection that would cause the median to be the value that we discarded.

I don't understand it completly, do I have to enter values and then enter one value wich isn't incorporated into the vector, this then proves that by discarding a value will leave you with a wrong median?