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春期シプキャン関西
くま @y_kuma365
お題:2015年度東京大学入試問題より
Cとは
単純に組んでみた
動かない
☞2015*2014*2013*2012*2011*2000・・・ > 10^31 でオーバーフロー
組む前に気づけよww
問題を考え直そう。
☞偶数かどうか聞いてるんだから、素因数2の数だけ数えたら良い!
(Cの計算結果は必ず整数)
アルゴリズム説明
分母→1*2*3*4*・・・
となるから、
1*2*3*・・・ = 2^?*(奇数)
と変形した時の?を求める
分子→2015*2014*2013*・・・
となるから、
2015*2014*・・・ = 2^?*(奇数)
と変形した時の?を求める。
while(x == (x/2)*2 && x>0){
x/=2;
a++;
}
組みなおすとこんな感じ
実行!
答えでた!!32!!!
わーい(/・ω・)/
ということは・・・
Javaで解いてみよう!!!(/・ω・)/(/・ω・)/(/・ω・)/(/・ω・)/
できた!できたよ!!!
わーい(/・ω・)/
まとめ
2015年度東京大学入試問題、大問5を解けた!
Javaの勉強の成果が出た!(3時間w)
わーい\(^o^)/
ありがとうございました。
byくま@y_kuma365

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