Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
5150	Junk-Mail Filter	1	119	20.54
5153	Compressed String		40	30.00
5154	Cryptography Reloaded (Act II)		31	27.89
5155	Exciting Time		40	13.06
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	8.88
5197	Differential Diagnosis	1	57	23.72
5300	Mexican Standoff		21	23.19
5373	Four Mines		14	8.10
5446	Fishing Net		159	30.87
5462	Art Plagiarism		9	22.22
5522	Buy Your House		12	35.90
5523	Highway Patrol		16	50.00
5531	Kutevi Hard		87	42.67
5566	Math with Bases		15	11.28
5637	LL and ErBao		5	50.88
5672	Captain Selection		4	38.89
5831	Permutation Jumping		135	58.71
5973	Selecting Teams		225	22.87
6052	PBCGAME		81	26.99
6059	Another GCD problem		331	45.61
6230	Dictionary order		4	6.78
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		27	47.71
6690	A - Comparison Expressions		54	32.76
6693	C - Karaoke		5	20.00
6695	E - Publish of Perish	1	707	39.79
6706	Making Chess Boards		25	26.15
6709	Multiplying by Rotation	1	88	51.00
6711	Transform a Sequence		40	45.65
6720	Paper Fold		19	13.01
6732	Camels		76	41.88
6738	Nice Quadrangles		176	42.55
6767	Sequence Function		11	19.10
6804	Cheating or Not		16	14.09
6819	Yet Another Assignment Problem	1	41	11.56	1
6823	Seller Bob		66	21.99
6827	Last Minute Construction		22	17.94
6831	Two Ball Game		64	28.05
6832	To Score or not to score		43	28.16
6851	Fence		42	27.07
6860	Asistent		23	14.29
6885	Wonkas Oompa-Impa Dilemma		13	28.24