Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	USERS	ACC %	DIFFICULTY C I
10506	Prendonians	50	25.71
10507	Cheese-rolling World Cup	56	32.86
10508	Buttons	46	23.71
10538	Derp	58	38.61
10571	Soccer Challenge	30	35.40
10574	Soccer Ceremony	25	41.67
10585	Searching God	83	25.98
10586	Problems in Moria	39	28.16
10587	Enemies	41	36.62
10589	King	70	29.77
10607	Delivery	32	18.94
10621	MONO	22	15.79
10640	The Wild Wizard	97	26.91	1 1
10645	The Rail Network Renovation	98	33.33
10647	Divide And Conquer	12	16.25
10648	DUGDUG	49	25.15
10667	PASIJANS	68	48.21
10675	GENIJALAC	47	52.00
10683	DRIVE	1	1.54
10701	The Lazy Gamer	16	13.42
10799	Happiness at the lowest cost	16	5.23
10800	GAME	24	12.65
10809	Unlock it !	85	30.10
10814	Unique Paths	129	45.89
10877	Decoys and Diversions	47	18.45	9 17
10883	Customs	17	24.27
10919	I Hate Parenthesis	96	30.00	17 1
10945	Foodie Golu	63	28.53
11054	Discords Dilemma	27	26.32
11090	Large banner	32	31.71
11105	Email ID	74	21.78	1 1
11117	Restacking haybales 2012	239	57.77
11157	The Great Escape	82	45.65
11179	Korra in the Spirit World	26	41.24
11202	Number Theory	36	31.35	39 39
11276	Adventure	48	37.91
11334	Lucifer Sort	7	1.17	34
11355	SQUARE TO SQUARE	23	18.29
11384	Zoom Operation	4	16.00
11405	Just Like the Good Old Days	86	40.39
11407	Tied Down	19	27.38
11440	Unlock it ! Part 2	46	21.14
11444	MAXOR	110	36.07	9 26
11458	Ninja	124	15.55
11460	Planning Poker	257	41.99
11474	Totient Game	44	37.14
11482	Count on a trie	76	12.31	42 50
11493	Goto & labels	64	30.64
11496	Just the distance	20	11.88	17 17
11521	Dominant Strings	77	35.00