Sphere Online Judge (SPOJ)

list of tutorial problems (unsolved)

ID	NAME	QUALITY	USERS	ACC %	DIFFICULTY C I
7411	Reward for the hard work		82	54.55
13390	Reverse Words		122	31.22	1 1
7289	Reverse text		262	35.57
18644	Reverse Precedence		5	71.43
10486	Reverse number		249	53.24
12166	Reverse And Add		60	34.39
14745	Reverse	1	427	44.80	1 1
7663	Return SIGSEGV	2	1211	39.39	26 26
25216	RETO SALARIOS		22	58.14
25022	RETO MCM	1	53	74.36	1 1
25509	RETO DOC 7		4	85.71
25249	RETO 6 MARATON 11		0	0.00
25507	RETO 6 DOC		9	100.00
25246	RETO 4 MARATON 10		11	18.35
25239	RETO 1 MARATÓN 11 (Calentamiento)		8	66.67
25530	RETO 06 DOC		11	100.00
22788	Research Problems	2	6	10.94
14025	Required - BYU Box	-1	36	84.44
15761	Replace Letters	-1	76	58.05
9173	Repetitions		13	16.90
13837	Repeated Numbers		7	49.30
23841	Repeat Your Tasks	-1	27	43.59
20750	Remove Duplicates 3		23	9.46
20749	Remove Duplicates 2		234	63.68
20748	Remove Duplicates		86	58.86
32109	Relaying the roads		133	95.99
4554	Relax! It is just a game	-8	3880	48.48	1 4
13421	RELATIVE PRIMES		37	74.60
7865	Regular expressions (Easy)		16	39.66
2626	RegExp Master	-1	88	36.72	34 17
32013	Red-Black Trees		177	85.85
26496	Recursive World!!!		100	38.27	15 26
20762	Recursive Functions		28	62.50
8142	Recursive function	1	81	43.65
1239	Recurrence Equation Finder		23	70.45
22793	Rectangular Spirals		6	13.43
13213	Rectangle Intersection	1	61	17.87	1 1
9106	REARRANGE		128	38.80
28178	Real Give Away	1	38	53.42	1 1
40456	RAU A		0	0.00
5371	Rational Number		150	43.01
7273	Rank of a Permutation		89	49.55
22800	Ranjan And Friends		24	89.29
25139	Random Bingo Cards		17	39.22
15444	Raise the Power 300 pts	-1	65	34.57	1 17
11109	Race Results		36	21.43
22753	Quickly sort a list of integers		246	34.69
21865	Quick Transaction		22	76.67
4193	Quick answer		5	17.50
34098	Queues		85	60.67

list of tutorial problems (unsolved)

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