That's the question.

分鐃緒申鐃緒申鐃純い鐃緒申鐃緒申鐃� - 鐃緒申同鐃緒申鐃緒申鐃夙わ申2鐃駿わ申鐃淑わ申鐃処う鐃祝わ申鐃緒申廚箸鐃緒申鐃緒申廛鐃緒申鐃緒申鐃殉の緒申鐃緒申鐃緒申鐃緒申鐃春わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃順き鐃緒申鐃緒申鐃緒申鐃銃わ申鐃緒申
鐃緒申鐃塾居申鐃緒申鐃叔種申張鐃緒申鐃銃わ申鐃緒申茲�鐃祝￥申同鐃緒申鐃緒申鐃夙わ申2鐃駿わ申鐃淑わ申鐃緒申Only and Only Once鐃緒申鐃暑い鐃緒申DRY鐃緒申Don't Repeat Yourself鐃祝」わ申無鐃緒申鐃叔考わ申鐃銃わ申鐃殉わ申鐃夙￥申鐃春わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃順き鐃緒申鐃純下鐃緒申鐃暑ケ鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃藷ある。

分鐃緒申鐃緒申鐃純い鐃緒申鐃緒申鐃重�鐃緒申鐃銃わ申鐃緒申茲�鐃祝￥申鐃渋は「件申鐃緒申鐃瞬わ申鐃淑わ申鐃竣とわ申鐃緒申鐃緒申鐃緒申砲蓮鐃緒申峽鐃緒申鐃緒申屬鐃緒申覆鐃緒申鐃緒申鐃塾誌申鐃夙みわ申鐃緒申廚箸鐃緒申鐃緒申鐃緒申鐃緒申箸鐃夙種申鐃緒申鐃�

鐃純え鐃緒申鐃春ワ申鐃旬ナッワ申鐃緒申鐃塾わ申鐃夙わ申佑鐃緒申討澆襦�1, 1, 2, 3, 5, 8鐃夙わ申鐃緒申鐃緒申鐃緒申鐃薯見わ申鐃緒申鐃銃￥申鐃瞬種申鐃緒申鐃緒申鐃塾は駕申?鐃竣わ申聞鐃緒申鐃曙た鐃初、鐃緒ざ鐃緒ざ

perl -le 'sub f{my $n=shift; $n<2 ? $n : f($n-1)+f($n-2)}; print f(7)'

鐃淑どとわ申鐃塾は器申抜鐃緒申鐃緒申鐃緒申鐃緒申鐃塾まわ申5鐃緒申8鐃緒申足鐃緒申鐃緒申13鐃夙わ申辰鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃�20鐃緒申鐃旬は駕申?鐃竣と醐申鐃緒申譴随申蕁�

perl -le 'sub f{my $n=shift; $n<2 ? $n : f($n-1)+f($n-2)}; print f(19)'
鐃夙わ申辰鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃祝わ申鐃曙が鐃緒申100鐃緒申鐃旬」とわ申鐃祝なっわ申鐃初、鐃緒申鐃緒申鐃�f()鐃緒申鐃緒申鐃緒申慮鐃縦常申鐃緒申鐃宿�鐃竣で￥申鐃純え鐃緒申 
perl -MMemoize -le 'sub f{my $n=shift; $n<2 ? $n : f($n-1)+f($n-2)};' \
 -e 'memoize "f"; print f(100)'

鐃夙わ申鐃緒申鐃緒申鐃緒申Memoize鐃緒申箸鐃緒申箸鐃緒申鐃緒申鐃緒申襪わ申録鐃緒申悗鐃緒申箸鐃緒申鐃�

perl -le '$a=(1+sqrt(5))/2; $b=(1-sqrt(5))/2' \
 -e 'sub f{my $n=shift; int(($a**$n+$b**$n)/sqrt(5))}; print f(100);'

鐃夙わ申鐃緒申鐃緒申必鐃竣わ申鐃出てわ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃祝駕申鐃駿も繰鐃緒申鐃瞬わ申鐃銃使わ申鐃塾でわ申鐃緒申弌鐃�

perl -le '$a=(1+sqrt(5))/2; $b=(1-sqrt(5))/2;' \
 -e 'sub f{my $n=shift; int(($a**$n+$b**$n)/sqrt(5))}; print f(shift)' 100

鐃夙わ申鐃緒申鐃緒申鐃祝逸申鐃緒申鐃叔誌申鐃緒申任鐃緒申鐃処う鐃祝わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃熟削申任鐃緒申泙鐃緒申鐃塾ではなわ申鐃緒申鐃緒申鐃夙実行駕申能鐃淑テワ申鐃緒申鐃夙フワ申鐃緒申鐃緒申砲鐃緒申鐃緒申鐃叔￥申fib.pl 100鐃夙わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申

鐃緒申鐃緒申鐃緒申鐃叔緒申鐃緒申鐃獣て￥申鐃緒申1, 1, 2, 3, 5, 8鐃塾種申鐃緒申鐃緒申鐃塾わ申?鐃竣わ申聞鐃緒申鐃曙た鐃初、鐃竣ワ申鐃緒申鐃緒申鐃緒申颪�のわ申鐃緒申鐃宿わ申鐃緒申鐃緒申鐃叔はなわ申鐃緒申鐃緒申鐃瞬とっとと考わ申鐃淑わ申鐃叔わ申辰鐃緒申泙辰鐃緒申鐃緒申鐃緒申瓩�鐃銃安わ申鐃銃旨わ申鐃竣とわ申鐃緒申鐃緒申魯廛鐃緒申鐃緒申鐃緒申妨造蕕削申鐃緒申鐃緒申了鐃緒申鐃叔醐申鐃緒申鐃暑。

鐃緒申銚鐃緒申鐃緒申鐃塾は￥申鐃緒申鐃緒申鐃峻の「考わ申鐃緒申戮鐃緒申鐃緒申鐃獣わ申鐃殉わ申鐃駿わ申鐃緒申鐃竣わ申鐃緒申鐃緒申蓮鐃緒申屬鐃獣てみなわ申鐃夙」わか鐃緒申覆鐃緒申箸鐃緒申鐃緒申鐃緒申箸鐃緒申鐃緒申屬鐃獣てみて￥申鐃緒申鐃緒申立鐃緒申鐃緒申鐃緒申鐃緒申覆鐃緒申鐃出考わ申鐃緒申廖鐃緒申鐃緒申里箸鐃緒申鐃緒申鐃緒申譴�鐃瞬枯れた鐃緒申鐃暑ゴ鐃所ズ鐃緒申廚里茲�鐃叔わ申鐃暑。

鐃緒申20鐃緒申鐃緒申鐃緒申鐃祝常申鐃緒申鐃緒申鐃潤く鐃祝は￥申鐃殉わ申10鐃緒申鐃緒申鐃緒申鐃祝常申鐃緒申鐃緒申鐃潤い鐃銃みてわ申鐃緒申鐃所か鐃緒申鐃獣わ申鐃緒申鐃緒申鐃緒申20鐃緒申鐃緒申鐃緒申砲鐃緒申鐃緒申覆鐃縦�鐃緒す鐃緒申鐃緒申鐃潤い鐃竣とわ申鐃獣わ申鐃塾わ申誰鐃緒申鐃獣わ申鐃緒申鐃塾わ申"Programming Pearl"鐃塾どわ申鐃緒申鐃塾ペ￥申鐃緒申鐃祝載ってわ申鐃緒申鐃緒申鐃夙ばわ申鐃緒申

鐃叔駈申悩鐃殉わ申鐃緒申鐃塾は￥申鐃緒申探鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃粛わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃竣とわ申鐃緒申鐃緒申鐃緒申任鐃緒申襦Ｊ�鐃緒申鐃緒申鐃純い鐃緒申鐃緒申鐃緒申entry鐃叔種申分鐃塾ワ申鐃緒申奪鐃緒申鐃塾随申鐃緒申鐃緒申嘆鐃緒申鐃銃わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃叔駈申鐃緒申悗鐃緒申発鐃緒申鐃緒申鐃銃わ申鐃殉わ申鐃緒申鐃夙わ申鐃塾わ申鐃緒申戮鐃緒申鐃緒申鐃緒申鐃緒申茲随申茲�鐃祝思わ申鐃緒申鐃緒申鐃緒申鐃緒申泙鐃緒申鐃緒申鐃緒申箸覆里鐃緒申鐃�

Dan the Lazy, Impatient, and Hubristic