Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
98	Dance Floor	3	727	40.34	12 12
151	The Courier	38	1069	35.62	22 23
227	Ordering the Soldiers	22	1478	33.31	21 23
676	Sorting is not easy	9	542	39.75	19 32
1700	Traveling by Stagecoach	9	476	39.35	17 16
2050	Strange Billboard	10	805	60.55	13 29
2530	Tiling a Grid With Dominoes	60	2440	64.85	16 24
2856	Help Bob	6	278	31.72	21 23
3436	Histogram	44	1546	44.27	19 22
3477	Baby	28	955	46.67	21 24
3749	Subset Sums	74	4224	26.66	17 20
3877	Cvjetici	18	986	48.67	12 21
3883	LATGACH3	55	3205	56.47	10 20
3932	Point Connection Game in a Circle	3	768	35.47	13 21
3953	Paid Roads	8	261	27.57	19 26
4180	Pizza Location	2	577	18.60	31 17
4201	Coder Ratings	26	1397	35.83	15 18
4329	Counting K-Rectangle	4	389	30.05	20 28
4480	Chaos Strings	14	533	30.09	17 22
5298	Interval Challenge	4	143	16.92	24 27
6294	Yodaness Level	74	3574	49.30	15 16
8916	Villages by the River	7	279	24.41	13 20
9386	Re-Arrange II	9	278	44.33	21 17
10210	After Party Transfers	1	39	4.99	34 28
10500	Haybale stacking	24	4042	34.76	9 14
12734	Seating Arrangement	7	165	60.52	6 15
15439	Zombie Outbreak	5	75	22.86	21 21
15766	Enjoy Sum with Operations	15	377	27.21	20 26
16487	Update the array !	165	5027	38.77	9 14
18187	Ingredients	10	295	31.69	21 23
18963	Bhagat The Bit Man	10	661	31.69	5 12
19216	Super Mario Revisited	6	22	7.24	20 23
20957	Alia and 3 Khans	1	77	31.54	34 17
25179	Kaos	9	282	40.67	19 25
34063	Chiaki With Intervals (Easy)		22	27.96
35277	DNA of Elf	3	20	31.30	17 34
36653	Blind Escape II	3	12	56.00	23 28
36941	AND Queries	4	22	30.94	23 34
36946	March Of The King	3	16	17.24	45 45