0497253
2020/09/06(日) 21:09:12.93ID:loE/lDcano warnings 'experimental';
use feature qw{signatures say};
$T = <>;
chomp $T;
push @{$p{$$_[0]}}, $$_[1] for map{[split' ']}<>;
use List::Util 'max';
sub f($t, $i) {
my $s = 0;
if (0 < $i and $i < 11) {
return $m[$t][$i] if defined $m[$t][$i];
$s++ if grep{$_ == $i} @{$p{$t}};
$s += max(f($t+1, $i-1), f($t+1, $i), f($t+1, $i+1))
if $t < $T;
$m[$t][$i] = $s;
}
$s
}
say f(0, 1);