Equivalence relation and partitions

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Define an equivalence relation on the set R that partitions the real line into subsets of length 1.

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It's actually easiest to work backwards on this problem. We first define the ste of equivalence classes, $$\{[n,n+1):n \in \mathbb{Z}\}$$ and say $x,y \in \mathbb{R}$ are equivalent if they belong to the same equivalence class.

Any set partition gives rise to an equivalence relation in this way.

(This is the same as Stefan H.'s comment, but there's not much else you can do, other than shift the segments. Or perhaps you could break them into disjoint segments with total length $1$.)