Richa and Her wish

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We all know that even a small child can operate a mobile phone.Richa has a long desire to buy a phone.so she asks her father to buy a phone for her.He accepts to buy a phone based on completion of assignment given to her.So he draws a picture of a keypad,which is similar to mobile phones and asks her to form all possible words in alphabetical order by using the given numbers.He gives her an array

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solution.cppC++17

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