Sphere Online Judge (SPOJ)

ID	NAME	QUALITY	USERS	DIFFICULTY C I
36941	AND Queries	4	12	23 34
3477	Baby	28	948	21 24
36653	Blind Escape II	3	8	23 28
2050	Strange Billboard	10	802	13 29
36946	March Of The King	3	13	45 45
151	The Courier	38	1043	22 23
40400	Count Set Bits		405	1 1
3877	Cvjetici	18	979	12 21
98	Dance Floor	3	718	12 12
35277	DNA of Elf	2	13	17 34
2530	Tiling a Grid With Dominoes	60	2408	16 24
10500	Haybale stacking	22	3387	10 14
2856	Help Bob	6	274	21 23
3436	Histogram	44	1512	19 22
12206	Hidden Password	10	835	11 6
18187	Ingredients	10	278	21 23
34063	Chiaki With Intervals (Easy)		15
5298	Interval Challenge	4	135	24 27
25179	Kaos	9	276	19 25
20957	Alia and 3 Khans	1	74	34 17
4329	Counting K-Rectangle	4	387	20 28
676	Sorting is not easy	9	538	19 32
3883	LATGACH3	55	3179	10 20
9386	Re-Arrange II	9	270	21 17
4480	Chaos Strings	14	529	17 22
3932	Point Connection Game in a Circle	3	755	13 21
3953	Paid Roads	8	251	19 26
18963	Bhagat The Bit Man	10	657	5 12
227	Ordering the Soldiers	21	1462	21 23
4180	Pizza Location	2	573	31 17
12734	Seating Arrangement	7	159	6 15
4201	Coder Ratings	26	1389	15 18
19216	Super Mario Revisited	6	21	20 23
27043	Subset Pattern		33	1 1
3749	Subset Sums	74	4082	17 20
15766	Enjoy Sum with Operations	15	361	20 26
10210	After Party Transfers	1	36	34 28
1700	Traveling by Stagecoach	9	458	19 17
15439	Zombie Outbreak	5	70	21 21
16487	Update the array !	165	4939	9 14
8916	Villages by the River	7	271	13 20
6294	Yodaness Level	74	3542	15 16

#bitmasks

Bitmask is data that is used for bitwise operations

https://en.wikipedia.org/wiki/Mask_(computing) https://en.wikipedia.org/wiki/Bitwise_operation https://en.wikipedia.org/wiki/Bitwise_operations_in_C https://en.wikipedia.org/wiki/Binary_number https://en.wikipedia.org/wiki/Subnetwork - applications of bitmasks in computer networks