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Jianli Shen
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#include <ext/hash_map>

typedef HASH_MAP<Addr1, Addr2> AddrPair;
typedef HASH_MAP<AddrPair, int> PairCount;
typedef HASH_MAP<Addr1, PairCount> PairMap;

AddrPair addrPair;
PairCount pairCount;
PairMap pairMap;

I just want to use such structure to count the frequent of addrPair.

eg. <<A, B>, 6>
<<A, B1>, 8>
<<A, B2>, 4>
<<A2, C2>, 10>
<<A3, D2>, 16>

Don't know how to define the data structure, the above one don't work well.

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