I think also you could use this technique I wrote in this post: dev.to/adtm/whats-your-favorite-al... :)
negating numbers on the fly and checking if they exist, if it doesn't - add +1 to the counter.
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I think also you could use this technique I wrote in this post: dev.to/adtm/whats-your-favorite-al... :)
negating numbers on the fly and checking if they exist, if it doesn't - add +1 to the counter.