Create List by Unique Key with Linq

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Given a list of Source, Target both of which are ints:

1, 2
1, 5
2, 1
3, 4
3, 6

Is it possible to merge them with Linq so that the following is produced List<Tuple<int,List<int>>:

1, [2,5]
2, [1]
3, [4,6]

Given a larger list of a couple of thousand items, would using Linq be the fastest way to perform the above merge?

asked 41 secs ago

g18c

193

Create List by Unique Key with Linq