Queue: array in which you insert at front and remove from rare.

Static Queue: queue which is of fix size and can not variate in size at runtime.

Optimized way to count the elements present.


F -> front
R -> rare
No -> no of elements present
Max_size -> max size of queue.

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if(F > R)
No = F - R;
else if( R > F)
No = ((Max_size - R) + F)
else
No = 0

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