Addition of two integers without using any arithmetic operation

Addition of two integers without using any arithmetic operation.

Addition of two integers with using only bitwise operation.

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codechef problem link :

[vijaysahani]

It basically need some knowledge of digital logic like half adder we have used

[raulvinci]

Sir pls help, can't find some relation b/w single bits

[shobitprashantnair]

bro did you get 100percent using this idea?? im getting only 50percent correct