Diferente pentru blog/meet-in-the-middle intre reviziile #24 si #23

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Meet in the middle (sometimes called split and merge) is a clever approach which tries to trade off space for time. Let’s discuss a few applications.
h2. 4sum
h2. a + b + c = d
bq. Given an array of integers, find out if there are any four numbers such that the sum of the first three equal to the fourth (you can use the same number more than once).

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