Suggest Data Structure which implement this scheme.

Can any one suggest any data structure/code such that if we map 1 to a, 2 to b, 3 to c i.e.

1 --> a

2 --> b

3 --> c

then we can also reverse lookup such as if i query ‘a’ then it should output 1 and similarly 2 and 3 for ‘b’ and ‘c’ respectively.

Also if i change the mapping afterwards from above mapping to :

1 --> a

2 --> a

3 --> c

then after reverse lookup i should get (1,2) for ‘a’ and (3) for ‘c’.

You can use

stl map

the implementation is as follows

map<char,vector >;
map <int,char>;

So you use two data structures for two way access.

Hope this helps.

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