popFront causing more memory to be used

[bearophile]

ixid:

>             int iter_next = iter + 1 > k? 0 : iter + 1;

This is becoming a "fixed size circular queue". But maybe a 
modulus is faster than a branch here. (It's better when k is 
always a power of two, you don't need a modulus. And even better 
if your size is a multiple of the page size).


>             nums[iter_next] = total % 10^^8;

In such cases I suggest to add (), to not force the person that 
reads the code reader to remember the precedence of uncommon 
operators.

Bye,
bearophile