[ProjectEuler] 重回台灣第八名

發現因數分解還真好用。



只要運算次數在 10^10 到 10^11 等級的，都有暴力法 (brute force) 的價值，

邊暴力邊想更好的辦法。



如果到 n = 10^15 以上的，千萬不要想暴力他，想辦法做 O(sqrt(n)) 甚至是 O(1) 的演算法。

Country: Taiwan

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	Username	Country	Solved	Level	Language
1=	howard0316		425+	17	C/C++
1=	utomaya		425+	17	C/C++
3	chsu		391	15	Matlab
4	xmk		318	12	Python
5	janshigola		316	12	Mathematica
6	progheal		264	10	Mathematica
7	mercurium		240	9	Python
8	ChopinPlover		239	9	Python
9	jchaoisaac		237	9	Python
10	weichunfong		214	8	Matlab
11	it3		207	8	Haskell
12	clark_chung		198	7	Python
13	redmilk525		191	7	C/C++
14	babufong		189	7	Pencil/Paper
15	kamesan		177	7	C/C++
16	yllan		170	6	Scala
17	Ronson Wang		169	6	Haskell
18	white1033		165	6	Python
19	prac		164	6	Python
20	acherub		162	6	Python
21	chenhsi		158	6	Java
22	rueycheng		151	6	C/C++
23	beephoenix		149	5	Python
24	PTTacgfans		146	5	C/C++
25	farmdeep		144	5	Python
26	kcwu		136	5	Python
27	hsucheng		136	5	Python
28	mic_euler		135	5	Python
29	ZIN		120	4	C#
30	mengsungwu		112	4	Python
31	wildmb		109	4	Python
32	jurian0101		108	4	Mathematica
33	hsiu		107	4	Python
34	avgman		106	4	Python
35	bhrgunatha		106	4	Racket
36	C.K.Yang		104	4	C/C++
37	betaveros		102	4	Haskell
38	jtjang		101	4	Java
39	meowth		99	3	C/C++
40	seanday		93	3	Matlab
41	ironhead		89	3	Python
42	chenaren		86	3	Python
43	will_lin		83	3	C/C++
44	b4283		82	3
45	johnathan79717		82	3
46	wizist		81	3	Erlang
47	Aethanyc		78	3	Python
48	flylaputa		77	3	Matlab
49	weihsiu		77	3	Scala
50	shik		77	3	C/C++
51	NidoLiao		76	3	LabVIEW
52	ejialan		76	3	Matlab
53	swem		74	2	Python
54	mikechien		72	2
55	Stela		71	2	Matlab
56	patrick_sun		70	2	BASIC
57	big_sheep		69	2
58	fu10373		68	2	C#
59	Joybo		68	2	Python
60	SpaXe		67	2	Python
61	kerson		65	2
62	STEP4		65	2	C/C++
63	letoh		64	2	Python
64	stimim		64	2	C/C++
65	will945945945		63	2	Python
66	610211011		62	2
67	mingjerli		61	2	Matlab
68	bryan60319		61	2
69	ypcat		60	2	Python
70	raincross		60	2	C/C++
71	49911077		60	2
72	wanju		60	2
73	weihsuan		58	2	Matlab
74	DreamSea		57	2	Java
75	JChien		56	2	Python
76	looser		55	2	C/C++
77	tobygameac		55	2	C/C++
78	keenhenry		55	2	Python
79	Nierrrrrrr		54	2	C/C++
80	uthavin		54	2	Java
81	xenonusiope		53	2	Scheme
82	zard1989		53	2	Perl
83	yoyo2964		53	2
84	celestine.kao		52	2	Python
85	tkcn		51	2	Python
86	henchi		51	2	Java
87	godman		50	2	Python
88	Hoskiss		50	2	Python
89	cedricl		49	1	C/C++
90	cw.ahbong		49	1	Python
91	jftsai		48	1
92	Raphanus Lo		48	1	Haskell
93	jaina		48	1
94	Nuticulus		48	1	Python
95	voya1021		48	1	Python
96	AlanSung		47	1	Python
97	linlee97		47	1	C#
98	didier91380		46	1	Factor
99	JellyFish		46	1	Java
100	xphacker		45	1	Java