Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
21173	String fertilization	58	43.45
21175	Rush hour	143	41.58
21176	Stapled intervals	51	60.00
21178	Encryption kit	51	31.46
21352	Avantgarde and Bicycle	23	37.84
21407	2x2 Subgrid Sum Problem (medium)	17	21.05
21463	Arithmetic Rectangle	36	20.47
21585	Hazzat’s Query	73	26.27
21962	GREAT SWERC	20	57.50
21967	City Park	19	38.36
21968	Playing with Geometry	15	59.26	17 1
21969	Money Transfers	4	23.81
21970	Safe Secret	18	42.00
22002	English	18	19.51
22090	Prime Power Test (Hard)	11	21.80	50 50
22271	Periodic function, trip 3	10	58.70	34 17
22315	Periodic function, trip 3 (easy)	11	27.33	17 17
22320	Polynomial Drawing	2	14.29
22530	Tinku got a job	16	16.67
22552	Flow on Tree	41	40.30
23134	Help Me Please!	27	23.36	1 17
23350	Mineral Farm	16	23.97	34 34
23351	Hiccup And Lucky Dragons	15	9.45	26 17
23383	ISOMORPH	28	43.65
23435	Game Calculator	1	5.88
23877	The Long Pile Game	29	23.81	17 17
23882	Watchers On The Wall	28	22.30
25214	Ohani And The Game	79	20.11	11 8
25336	Eefun Plays Doto	4	31.03
25382	Meetings	14	13.30
25452	Teaching Hazard	8	44.83
25480	Invading aliens	16	17.73
25684	Jolly Kingdom	17	16.51
25818	NEKAMELEONI	13	12.03
25960	Cat and Mouse I	57	14.54
26181	Walking Jumper	5	28.57
26187	Captain Claw	59	25.10	17 12
26306	Pointers	23	32.95
26695	Atul and Aastha Chronicles 2	140	37.19	11 9
26744	Coverage	22	39.13
26843	Who is the Best?	4	28.57
27092	Balanced Diet	14	39.53
27093	Branch Assignment	29	40.22
27095	Clock Breaking	18	58.54
27097	Longest Rivers	9	23.64
27103	What Really Happened on Mars?	6	42.86
27213	Periodic function, trip 5	11	62.43
27339	Queue of Soldiers	12	45.95
27491	Bidding Game	6	29.79
27494	Happiness	5	18.64