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I'm trying to understand the approximate polynomial time algorithm for subset sum problem at Wikipedia, but I stuck at the pseudocode's 3rd line:

let T be a list consisting of xi + y, for all y in S

What does this line mean? What is x, and how do I create the correct T list?

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Taken from the previous section:

The problem can be solved in pseudo-polynomial time using dynamic programming. Suppose the sequence is x[1], ..., x[N] and we wish to determine if there is a nonempty subset which sums to zero.

So, it appears that x is the input sequences of numbers, for which you're trying to solve, and thus x[i] is the i'th number in the sequence.

Thus, the list T is a map of S where each element of T is that of S but with x[i] added to it.

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