commit test
Merge remote-tracking branch 'origin/master'
Merge pull request #3 from 102yuta/master

サブルーチンと配列に少しコメントを
Merge remote-tracking branch 'origin/master'
Update ex2_3.pl
Update ex4_5.pl
test
Merge remote-tracking branch 'origin/master'
used grep and map
map だけを使う方法