Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
3490	Hidden Triangle	12	26.87
3492	Braille Transcription	16	14.16	17 17
3495	The Nobel Thief	14	51.52
3533	Game on board	26	31.14
3543	Matrica	56	39.90
3582	Restaurant Tab	24	21.90
3640	Hanoi Subway System Construction	36	40.78
3641	Earthquakes	26	36.14
3642	Pretty Printing	40	22.01
3645	Farthest Headquarters	60	26.80
3646	Adventure Tourism	46	14.43
3647	Moebius	2	2.36
3678	Cattle Bruisers	91	26.33
3733	Trezor	105	52.34
3762	Bread Tree	163	13.66
3867	Who is The Boss	170	25.29
3884	When (You Believe)	24	9.17
3890	Rectangles Counting	175	33.61
3893	Space settlement	67	31.56
3894	Bouncing Balls	28	31.54
3895	Matrix Game	26	21.77
3900	MinCut Query	78	28.99
3901	Black and White Nim	55	39.23
3922	Mystical River	128	25.67
3926	Manhattan Wire	80	14.07
3927	Polygon on the Grid	23	30.34
3929	Different Digits	74	22.75
3935	SHIFT Operator on Matrix	191	42.38
3939	Search of Concatenated Strings	28	24.40
3941	Kth Shortest Path	25	24.30
3942	Cleaning Robot	34	65.28
3961	Journey with Pigs	133	41.31
3965	Minimax Triangulation	60	40.00
3970	Convert to Decimal Base System	56	37.34	17 17
3972	Stargates	49	14.12
3981	Shortest Regular Bracket	82	33.78
4003	Subway planning	43	18.68
4004	Exploding CPU	146	46.49
4008	Con Voi	9	57.69
4010	Chặt cây	11	22.58
4021	Bipalindrome	183	30.77
4034	Pizza Delivery	53	16.51
4052	Game	75	29.27
4060	A game with probability	210	22.15
4062	Rob Mini-Safe	114	39.46
4069	Morphing is Fun	29	16.07
4070	Two Professors	104	14.10
4083	Tele Broadcast	67	50.26
4097	Locomotive	35	37.89
4142	Ellipse	21	9.46