Sphere Online Judge (SPOJ)

list of tutorial problems (unsolved)

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
1474	Charge		21	32.89
8901	BRAINF__K DESIGN	1	21	55.81
9189	Edit Distance Variant 2		21	60.00
9362	Knight Moves		21	24.00
9989	Judging Olympia		21	30.00
10360	BF writing	1	21	59.32
11731	PATENTES	1	21	57.45
12081	Picture Perfect	1	21	36.71
13401	Sherlock		21	53.06
13839	CAMPANAS2		21	19.17
14721	Knives Are Better	1	21	40.38	34 34
15583	Stan wants to know the Time 200 pts		21	78.79
16508	Divisors		21	42.05
18398	Math assignment		21	44.00
19111	Interesting or Not		21	32.00
19383	Sort for Addition		21	40.35
20154	Druid and Queries		21	55.32
22398	BICIKLI		21	23.28
23535	Dos pintores y una pieza	-1	21	46.88	1 1
23884	Illegal Lol Moments	-1	21	63.89	1 1
25192	Profits		21	46.32
25231	1RETO 11 MARATON	-1	21	37.10
25966	Base Is Damn Easy	-2	21	47.17	1 1
30840	Ada and Database		21	40.96	17 17
33329	Finding Max	1	21	85.71	1 1
36961	Vùng bao lớn nhất		21	12.55
8264	Find The Pattern		20	22.94
8585	Easy Factorials		20	10.38
11999	Catalan Powered	1	20	21.88	1 17
12074	Magical Ladders		20	28.92	1 1
12208	The Chain Reaction		20	36.92
13154	Very Fast Division		20	38.89	17
14038	Autumn Leaves (Easy)		20	91.49
15669	Ross got a puzzle 400 pts		20	45.16
16481	Split the number		20	31.39	34 17
17387	A True Patriot		20	21.74	17 1
20677	Easy Equation		20	29.41
20763	Journey of nikki	1	20	32.81
22557	CUDAK	-1	20	22.00	17 17
23006	The Next Number	2	20	21.93	17 17
28010	Copy Cat		20	11.22
34479	Möbius function zero distribution	4	20	37.66	6 17
34808	Crosswords	-2	20	53.97
37365	Biểu thức hậu tố	1	20	25.00
3917	Tree Query		19	34.43
4192	Lucky cities		19	28.57
6653	Lexicographic Order 1		19	69.23
6666	How Many Trees 1		19	33.85
8226	PrePrimes	2	19	35.61	17 17
9339	Contains Prime		19	41.18