Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
5102	Mystic Craft	57	46.20
5103	Top 10	43	15.98
5104	Spam Detection	16	15.97
5115	Two "Ways"	67	15.62
5143	Binary Integer	53	50.00
5144	Cryptography Reloaded (Act I)	34	26.43
5145	Déjà vu	17	14.94
5146	Experiment on a … Cable	16	36.36
5147	Fire-Control System	37	22.40	34 17
5149	History of Languages	32	17.70
5150	Junk-Mail Filter	147	22.57
5153	Compressed String	46	28.21
5154	Cryptography Reloaded (Act II)	36	27.49
5155	Exciting Time	45	13.96
5156	Flowers Placement	43	31.33
5158	Heroes Arrangement	17	12.94
5159	Island Explorer	37	15.74
5160	Jinyuetuan Puzzle	45	37.70
5163	Tower of Vientiane	105	34.94
5182	Double Sorting	15	8.70
5300	Mexican Standoff	26	24.19
5373	Four Mines	14	6.25
5446	Fishing Net	176	31.96
5462	Art Plagiarism	13	21.84
5522	Buy Your House	17	39.62
5523	Highway Patrol	19	43.01
5531	Kutevi Hard	90	43.40
5566	Math with Bases	15	10.78
5637	LL and ErBao	5	41.43
5831	Permutation Jumping	137	59.48
5973	Selecting Teams	234	23.28
6052	PBCGAME	85	27.45
6059	Another GCD problem	342	45.16
6072	Chocolate	161	21.61	17 34
6230	Dictionary order	6	9.30
6289	Bomberman	214	25.76	17 17
6292	Shmoogle Wave	17	23.01
6296	Experiment	34	23.08
6500	Counting Diameter	38	28.21
6503	Travelling Salesman Again !	92	35.17
6652	Skiers	35	47.26
6678	Load Testing	204	59.78	34 34
6690	A - Comparison Expressions	57	33.22
6693	C - Karaoke	26	56.18
6706	Making Chess Boards	27	22.88
6711	Transform a Sequence	41	30.94
6720	Paper Fold	19	12.21
6732	Camels	88	37.93
6738	Nice Quadrangles	180	40.97
6767	Sequence Function	14	18.52