# The two arrays are in @arr1 and @arr2

my %hash;

# loop over the arrays
for (0..$#arr1) {
    # Add the value from arr2 to the approprate entry in 
    # the hash
    $hash{$arr1[$_]} += $arr2[$_];
}

foreach (keys(%hash)) {
    print "$_  $hash{$_}\n";
}