Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
4083	Tele Broadcast	62	49.46
4097	Locomotive	34	44.30
4142	Ellipse	17	8.46
4154	IZBORI	36	24.54
4156	PLAHTE	64	35.75
4160	A1 Road	86	50.46
4178	Distance on a square lattice	122	54.32
4185	Cube	52	35.93
4188	Amazing equality	38	13.58
4189	Landing	4	3.64
4202	Brackets Parade	232	44.26
4210	Fast Maximum Matching	10	41.94
4211	Fast Maximum Flow	16	22.22
4212	Another Longest Increasing Subsequence Problem	10	46.15
4225	Payment System	30	66.67
4275	rotate it	40	55.70
4278	Battlefield	5	45.83
4307	Stamps	27	41.56
4308	Byteantean towns	55	24.78
4309	Circular game	32	19.89
4311	Quasi-template	51	33.33
4324	The fate of the pineapple	40	28.41
4361	Connected Points	9	52.17
4378	Twofive	63	32.26
4407	Counting Arborescence	100	34.02
4410	Repair the Door	58	22.49
4411	Counting Expressions	29	42.47
4414	Highway	54	22.04
4420	Counting Graphs	54	34.33
4421	Irreducible polynomials over GF2	62	18.01
4453	Bouncing Balls II	219	27.73
4455	Going to the Movies	86	36.33
4459	Muzidabutur	4	21.43
4461	A Famous Airport Manager	23	16.36
4477	Flower growing	112	22.73
4478	Counting Expressions II	14	35.29
4523	Binomial Coefficients	209	41.72	23 12
4528	Frog Wrestling	66	43.23
4533	Determinant of Banded Matrices	16	32.67
4552	Adding up Triangles	137	36.30
4558	I Speak Whales	182	42.26	17 17
4559	A Day at the Races	122	17.08
4574	Riding in cycles	41	24.31
4586	Texas Trip	66	37.85
4588	SETI	124	67.61
4657	Gas Wars	139	35.32	34 17
4717	Grid Points in a Triangle	98	46.86
4785	Starship	10	28.80
4828	ZSequence	51	19.33
4881	Words on graphs	103	11.39	34