ALANs DINNER

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$Alan$ and his teammates entered into war. Alan is assigned with a task to give a headshot to $Shroud$ : $The$ $Lethal$. In order to get a $glorious$ $victory$ he has to solve the task. Chef gave you names of $N$ zones $Z_i,$ $1<=i<=N$ and he want you to find the number of pair of Zones $Z_i,Z_j$ such that $i < j$, whose number of common distinct characters are $atleast$ $2$. Help $Alan$ to

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solution.cppC++17

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