Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
5115	Two "Ways"	63	15.00
5143	Binary Integer	49	50.85
5144	Cryptography Reloaded (Act I)	33	26.16
5145	Déjà vu	16	19.23
5146	Experiment on a … Cable	12	41.38
5147	Fire-Control System	30	18.60	34 17
5149	History of Languages	27	15.54
5153	Compressed String	41	30.62
5154	Cryptography Reloaded (Act II)	31	27.89
5155	Exciting Time	39	13.19
5156	Flowers Placement	41	31.06
5158	Heroes Arrangement	12	12.80
5159	Island Explorer	34	15.28
5160	Jinyuetuan Puzzle	40	36.69
5163	Tower of Vientiane	92	40.20
5182	Double Sorting	12	8.92
5300	Mexican Standoff	21	23.19
5373	Four Mines	14	8.24
5446	Fishing Net	147	31.37
5462	Art Plagiarism	9	22.22
5469	Houses	42	26.72	34 26
5511	Heavy Sequences	79	18.00	34 34
5522	Buy Your House	12	35.90
5523	Highway Patrol	16	50.00
5531	Kutevi Hard	86	42.48
5566	Math with Bases	14	10.82
5637	LL and ErBao	5	50.88
5672	Captain Selection	2	18.18
5831	Permutation Jumping	135	58.71
5973	Selecting Teams	222	22.69
6052	PBCGAME	81	27.35
6059	Another GCD problem	331	45.56
6072	Chocolate	153	21.22	17 34
6170	Homecoming	17	23.00
6230	Dictionary order	5	10.64
6289	Bomberman	208	25.52	17 17
6292	Shmoogle Wave	16	31.65
6296	Experiment	26	20.39
6500	Counting Diameter	36	40.78
6503	Travelling Salesman Again !	92	36.78
6652	Skiers	20	45.93
6678	Load Testing	200	59.73	34 34
6690	A - Comparison Expressions	54	32.76
6693	C - Karaoke	5	20.00
6706	Making Chess Boards	25	26.15
6711	Transform a Sequence	40	45.65
6720	Paper Fold	19	13.01
6732	Camels	74	41.92
6738	Nice Quadrangles	176	42.55
6767	Sequence Function	11	19.10