Have a large number (> 1bn) of integer co-ordinates (i, j). The i are ordered and the j unordered.
I want to create (j, i) with j ordered and i unordered ie. from: ... 6940, 22886 6940, 38277 6940, 43788 ... to: ... 38277, 567 38277, 90023 38277, 6940 ... I've tried the dictionary route and it works perfectly for small set of co-ordinate pairs but not for large sets as it hits memory capacity. Any ideas how I could do this? Dinesh
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