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  1. or download this
    $M,$N         final array element (should be $M)
(14,11) ==> final=13
...
(100,49) ==> final=99
(100,98) ==> final=99
(100,99) ==> final=99
  2. or download this
    use strict;
use warnings;
...
Error rate: 2.47524752475248
elisheva_ikegami
Error rate: 0