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my @array=qw(a b c d e);
my $num = 13;
...
# remaining 3 given to the first three (or randomly).
# Desired result:
my %result = (a=>3, b=>3,c=>3,d=>2,e=>2);

my $averge = int($num/@array);
my %result = map{$_=>$average} @array;
for my $i(1..($num - $average*@array)){
    ++$result{$array[$i-1]};
}