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You don't have to use the heap (dynamic allocation) nor the stack (local variables) to store the dictionary. You can declare a static data structure as global and house the dictionary in it.
For example, if you were to use a trie, you can check (empirically) what's the maximum number of nodes you'll need, and initialize a global 2D array with that number of ...
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It depends on the metrics used, I think those are heap and stack memory. Global variables don't show up in those statistics. Now if you can estimate an upper limit for the size of the dictionary...
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This is a bug in clang, which has been fixed in version 3.5. The CS50 team is working on getting an update out with update50.
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