Sphere Online Judge (SPOJ)

list of tutorial problems (unsolved)

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
13422	THE JUMPING BALL		59	58.22
13421	RELATIVE PRIMES		37	74.60
13407	Einstein Ring		9	43.48
13401	Sherlock		21	53.06
13397	How Many Primes		140	37.86	1 1
13396	Find Them All		33	42.74	1 1
13395	More Dragons		45	56.16	1 1
13394	Big Dragons		31	48.06	1 1
13393	Dragons		50	43.27	1 1
13392	Prime Or Not	1	177	22.85	9 17
13391	Binary		63	39.81	1 1
13390	Reverse Words		122	31.22	1 1
13389	Letter Count	1	799	55.54	1 1
13386	Rotations		15	28.57
13385	Balanced Bracket Expression		23	20.42
13383	Next odd extreme golf	-1	22	52.00	50 1
13356	Count Zero	1	70	89.89	9 17
13276	Who is Mafia	2	225	57.42	21 21
13238	SAMPLE PROB	-1	6	11.24
13216	Progression		60	32.79	1 1
13215	Kings on an Infinite Chessboard		68	34.97	1 1
13213	Rectangle Intersection	1	61	17.87	1 1
13212	Seconds Apart	1	55	37.14	1 1
13211	Progression	1	76	19.51	1 6
13210	Fun Triangle		117	32.55	1 1
13209	Divisors		145	45.69	1 1
13208	In Love with Loops	1	64	39.77	1 1
13207	Digital Triangle	1	114	49.34	1 1
13206	Multiples		152	45.60	1 1
13204	Easy as Cake		279	58.77	1 1
13203	Sort them All		149	39.86	1 1
13202	Great Grading Scheme		164	26.14	1 1
13201	Multiple of 3		377	39.21	1 1
13200	Sum It Up		220	26.06	1 1
13154	Very Fast Division		20	38.89	17
13153	Fast Division		119	49.57
13115	Julius Caesar Cipher		24	31.82
13089	Tetravex	1	140	52.69	17 17
13088	Free Palestine	-1	137	29.61
13085	Game		160	68.70
13082	BINARY CHALLENGE	3	287	32.24	17 26
12910	Addicted Numbers		148	29.57
12823	Print Big Binary Numbers		19	58.23
12801	Browsing History		51	40.88
12793	The power of two		110	51.35
12753	Fan Switches	1	236	67.22	1 1
12650	Even and Odd	1	66	35.04
12648	The Last Exam		15	61.54
12608	Switch	1	33	81.82
12607	Missing one		27	91.53