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Here, $C_1$ and $C_2$ are constants that concern several instructions:
$C_2$ corresponds to instructions executed only once l <- 0, the last executed test of while(A[l]!=NULL) and return l
$C_1$ corresponds to instructions executed several times: each test of while(A[l]!=NULL) but the last, and l<-l+1. Those are executed a total of $N$ times.
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