IWABUCHI Yu(u)ki (butchi) butchi

ART, Research, Technology.

butchi / YukiCoder89.nb

Created October 21, 2014 15:42

yukicoder No. 47 ポケットを叩くとビスケットが２倍

	(* http://yukicoder.me/problems/no/47 *)
	ans[n_] := Ceiling[Log[2, n]]

butchi / YukiCoder80.nb

Last active August 29, 2015 14:08

yukicoder No.53 悪の漸化式

	(* http://yukicoder.me/problems/no/53 *)
	a[k_] := 3^k/4^(k - 1)

	N[a[100]]

butchi / YukiCoder80_2.nb

Created October 30, 2014 16:23

yukicoder No.53 悪の漸化式

	(* http://yukicoder.me/problems/no/53 *)
	N[RecurrenceTable[{4 a[k] == 19 a[k - 1] - 12 a[k - 2], a[0] == 4, a[1] == 3}, a, {k, 0, 100}]]

butchi / yukicoder83.nb

Created November 2, 2014 16:57

No.55 正方形を描くだけの簡単なお仕事です。

	(* http://yukicoder.me/problems/no/55 *)
	pLi = Complex[#[[1]], #[[2]]] & /@
	Partition[ImportString["8 10 14 14 13 9", "Table"][[1]], 2];
	dLi = Abs[RotateLeft[pLi, 1] - RotateLeft[pLi, 2]];
	permLi = Permutations[pLi];
	p4Li = (#[[2]] + I (#[[1]] - #[[3]])) & /@ permLi;
	sqLi = Table[Append[permLi[[n]], p4Li[[n]]], {n, 1, Length[permLi]}];
	edgeLen[pLi_] := Abs[pLi - RotateLeft[pLi]];
	judgeLi = SameQ @@ # & /@ (edgeLen /@ sqLi);
	pos = Position[judgeLi, True];

butchi / file0.html

Last active August 29, 2015 14:09

要素からコメントアウトを取り出す ref: http://qiita.com/butchi_y/items/78ef939cbcef4f108c66

	<!DOCTYPE html>
	<html>
	<head></head>
	<body>
	<!--hoge-->
	foo
	<!--piyo-->
	bar
	<script src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
	</body>

butchi / file0.js

Last active August 29, 2015 14:10

負の剰余 ref: http://qiita.com/butchi_y/items/c400a06cbd15f0dad6fa

-5 % 2

butchi / YukiCoder158.nb

Last active August 29, 2015 14:11

No.106 素数が嫌い！2

	(* http://yukicoder.me/problems/no/106 *)
	(* TLEで失敗しました。 *)
	f[n_, k_] := Length[Select[Table[Length[FactorInteger[m]], {m, 2, n}], # >= k &]]

	f[2, 1]
	f[4, 2]
	f[1000, 4]

butchi / q-1.js

Created December 22, 2014 14:00

window.Objectのfalseのようなtrueの話 ref: http://qiita.com/butchi_y/items/0167ff91124c2f9bea2d

({}) !== ({}); // == ?

butchi / file0.js

Last active August 29, 2015 14:18

"+"を使わないプログラミング ref: http://qiita.com/butchi_y/items/3c3e9de3258c6a22ecd0

butchi / file0.txt

Last active August 29, 2015 14:18

Wikipedia項目から四字熟語の抽出 ref: http://qiita.com/butchi_y/items/b31ee2b9480546b43f0b