Setting any value will expand the array and set the other values to undef.
Well, yes, but that exactly what the challange wants you to avoid.
You don't want to spend time creating undefined
values.
Your data structure uses autovivication for the A array so it has the same performance but more overhead.
No. It's important to realize I did not describe the A array in Perl terms. Think C, or even better, assembler.
Just declare an array as a chunk of memory where integers
are stored. No initialization of the elements
allowed - just accept whatever values are in memory.
Abigail
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