Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
6052	PBCGAME	84	27.71
6059	Another GCD problem	338	45.35
6072	Chocolate	158	21.45	17 34
6230	Dictionary order	6	10.67
6289	Bomberman	211	25.49	17 17
6292	Shmoogle Wave	17	23.64
6296	Experiment	33	22.65
6500	Counting Diameter	36	27.27
6503	Travelling Salesman Again !	92	35.28
6652	Skiers	31	46.35
6678	Load Testing	203	59.60	34 34
6690	A - Comparison Expressions	57	33.22
6693	C - Karaoke	25	55.82
6706	Making Chess Boards	26	22.37
6711	Transform a Sequence	40	30.43
6720	Paper Fold	19	12.75
6732	Camels	86	37.50
6738	Nice Quadrangles	179	40.88
6767	Sequence Function	13	17.76
6804	Cheating or Not	17	14.29
6823	Seller Bob	72	21.56
6827	Last Minute Construction	23	17.01
6831	Two Ball Game	64	27.93
6832	To Score or not to score	44	28.53
6851	Fence	41	23.41
6860	Asistent	23	12.75
6885	Wonkas Oompa-Impa Dilemma	14	21.05
6895	Maximum Edge of Powers of Permutation	12	22.47
6949	PIN	143	28.26	17 34
6951	MP3 Player	36	26.59
6957	Partial Palindrome	3	6.49
6977	Odd Independent Sets	16	50.00
6981	The Least Number	22	23.85
6985	Rearranging Digits	54	22.30
6986	Summing Slopes	60	28.52
6999	Avoiding SOS Grids	67	10.52
7010	Police Business	6	25.37
7023	Cookies	19	29.03
7050	Necklace Decomposition	47	60.00
7100	Back To The Polygon	87	34.71
7193	The Pharaoh Curse	16	21.05
7248	Chess part1	102	23.45
7301	Lucky Controller	9	29.63
7323	Happy Days	47	45.22
7333	Shuffle Music	8	26.19
7336	Mastermind	491	36.19
7337	Shuffling	23	17.68
7378	Manhattan Companies	15	10.55
7387	Airplane Parking	55	23.36
7389	Rating Hazard	24	18.88