Sphere Online Judge (SPOJ)

list of classical problems

ID	NAME	CODE	USERS	ACC %
681	Building the Tower	HANOI07	30	23.83
682	Pairs of Integers	PAIRINT	150	30.73
684	Another Assignment Problem	ASSIGN4	71	13.38
685	Partition the sequence	SEQPAR	93	22.08
687	Repeats	REPEATS	175	34.44
688	Toy Cars	SAM	209	21.68
693	Lethal Warfare	LWAR	257	50.00
694	Distinct Substrings	DISUBSTR	558	25.39
695	Unite Fast	UFAST	112	31.13
696	Liar Liar	LIAR	142	49.27
697	Matrix Words	MWORDS	79	29.85
698	Plane Hopping	PLHOP	172	29.13
699	Huge Knap Sack	HKNAP	91	30.68
700	Branch Prediction	BPRED	57	17.53
702	Barn Expansion	EXPAND	111	29.42
703	Mobile Service	SERVICE	192	25.20
704	Remove The String	PSTRING	130	13.84
705	New Distinct Substrings	SUBST1	431	33.41
707	Triple-Free Sets	TFSETS	98	44.71
709	The day of the competitors	NICEDAY	263	26.90
726	Promotion	PRO	426	24.80
729	Move your armies	MAXIMUS	62	23.81
733	Mountain Walking	MTWALK	378	27.68
734	Ivan and his interesting game	IVAN	152	36.13
735	Minimum Diameter Spanning Tree	MDST	75	35.87
738	Another Counting Problem	TREE	144	42.93
739	The Moronic Cowmpouter	NEG2	1036	48.50
740	Treats for the Cows	TRT	735	37.03
741	Steady Cow Assignment	STEAD	129	30.08
744	Longest Permutation	LPERMUT	307	20.31
757	Thermal Luminescence	TEM	89	40.52
760	Convex Hull 3D	CH3D	34	37.42
764	Delay-noise Analysis	MIS	43	26.92
780	The Archipelago	ARCHPLG	14	19.35
827	Trigonometric optimization	TRIOPT	37	38.65
839	Optimal Marks	OPTM	167	25.25
850	Soccer Choreography	WM06	0	0.00
861	Counting inversions	SWAPS	146	25.26
866	DNA Translation	DNA	50	32.64
867	Perfect Cubes	CUBES	546	47.06
869	Galactic Import	IMPORT	78	63.85
870	Basically Speaking	BASE	579	44.21
871	Letter Sequence Analysis	SEQUENCE	48	43.71
872	Mark-up	MARKUP	70	27.91
898	Transmitters	TRANSMIT	138	47.63
899	Ws Cipher	WSCIPHER	309	42.57
900	Split Windows	SPLIT	24	75.76
901	Index Generation	INDEXGEN	33	60.00
902	Hangover	HANGOVER	1332	65.33
903	Double Vision	DOUBLEVI	34	61.19