code correction and optimization#2
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For it to work properly, your prime array has to be initialized with all 1s, so I changed it to a vector, which is equivalent and you can fill it initially with 1s as soon as you declare it.
Also, as all multiples of current prime is set to be not prime, the first multiple of the next prime that still isn't set to be not prime is pp, as all pk (for k<p) was set to be not prime in previous iterations.