Chef and Watch

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Chef has a Watch which is gifted by his friend.It is a digital watch. So the numbers in watch are Seven Segment display. Now you have a given a number $N$. You have to find the maximum number $K$ that can be generated using the segments used in that number i.e if you have given the $123$ then in seven segment display number of segments for $1$ is $2$, similarly for $2$ it is $5$ and $3$ it is $5$

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solution.cppC++17

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