use strict;
use Data::Dumper;

my %fruits=();
my @arr = ([1,1],[1,2],[3,5],[6,7]);

for (0..$#arr) {
  $fruits{$_} = $arr[$_]
}

print Dumper(\%fruits);

__END__

STDOUT:

$VAR1 = {
          '1' => [
                   1,
                   2
                 ],
          '3' => [
                   6,
                   7
                 ],
          '0' => [
                   1,
                   1
                 ],
          '2' => [
                   3,
                   5
                 ]
        };

##</code><code>##

...
for (0..$#arr) { $fruits{$arr[$_]->[0]} = $arr[$_]->[1] }
...
# thus:

$VAR1 = {
          '6' => 7,
          '1' => 2,
          '3' => 5
        };

##</code><code>##

...
for (0..$#arr) { $fruits{$arr[$_]->[0]} = [@{$arr[$_]}[1..@{$arr[$_]}-1]] }
...