#!/usr/bin/env perl
use 5.010; use warnings; use strict;
use List::Util qw(max first);

my @players = qw( Adam Bob Clay Dan Ed Frank George );
my @games = ( [1,2,3,4],
              [2,3,4,5],
              [2,4,5,6],
              [2,4,6,7],
              [2,4,6,7],
              [3,4,6,7],
              [1,3,4,7] );

chart( \@players, \@games, 2, 4 ); # print a chart from game 2 to 4
chart( \@players, \@games, 1, 7 ); # print a chart of all 7 games

sub chart {
    my $players = shift; # players array
    my $games   = shift; # games array
    my $start   = shift; # start game
    my $end     = shift; # end game
    my $pl      = max map { length $_ } @$players;

    say '-' x 40;
    for my $p ( 1..@$players ){
        printf "%-${pl}s | ", $players->[$p-1];
        for( $start..$end ){
            print is_in($p,$games->[$_-1]) ? 'X  ' : '   ';
        }
        say '';
    }
    say '-' x 40;
    printf "%-${pl}s | ", ' ';
    print "$_  " for $start..$end;
    say '';
}

sub is_in {
    return first { $_ == $_[0] } @{$_[1]};
}