The Weekly Challenge

Peter Campbell Smith

The weekly challenge

My solutions

Date	Challenge	Task 1	Task 2
2024-07-01	276	Complete day	Maximum frequency
2024-06-24	275	Broken keys	Replace digits
2024-06-17	274	Goat Latin	Bus route
2024-06-10	273	Percentage of character	B after A
2024-06-03	272	Defang IP address	String score
2024-05-27	271	Maximum ones	Sort by 1 bits
2024-05-20	270	Special positions	Equalize array
2024-05-13	269	Bitwise or	Distribute elements
2024-05-06	268	Magic numbers	Number game
2024-04-29	267	Product sign	Line counts
2024-04-22	266	Uncommon words	X matrix
2024-04-15	265	33% appearance	Completing word
2024-04-08	264	Greatest English letter	Target array
2024-04-01	263	Target index	Merge items
2024-03-25	262	Max positive negative	Count equal divisible
2024-03-18	261	Element digit sum	Multiply by 2
2024-03-11	260	Unique occurrences	Dictionary rank
2024-03-04	259	Banking day offset	Line parser
2024-02-26	258	Count even digits number	Sum of values
2024-02-19	257	Smaller than current	Reduced row echelon
2024-02-12	256	Maximum pairs	Merge strings
2024-02-05	255	Odd character	Most frequent word
2024-01-29	254	Three power	Reverse vowels
2024-01-22	253	Split strings	Weakest row
2024-01-15	252	Special numbers	Unique sum zero
2024-01-08	251	Concatenation Value	Lucky numbers
2024-01-01	250	Smallest index	Alphanumeric string value
2023-12-25	249	Equal pairs	DI string match
2023-12-18	248	Shortest distance	Submatrix sum
2023-12-11	247	Secret Santa	Most frequent letter pair
2023-12-04	246	6 out of 49	Sort language
2023-11-27	245	Sort language	Largest of three
2023-11-20	244	Count smaller	Group hero
2023-11-13	243	Reverse pairs	Floor sum
2023-11-06	242	Missing members	Flip matrix
2023-10-30	241	Arithmetic triplets	Prime order
2023-10-23	240	Acronym	Build array
2023-10-16	239	Same string	Consistent strings
2023-10-09	238	Running sum	Persistence sort
2023-10-09	237	Seize the day	Maximise greatness
2023-09-25	236	Exact change	Array loops
2023-09-18	235	Remove one	Duplicate zeroes
2023-09-11	234	Common characters	Unequal triplets
2023-09-04	233	Similar words	Frequency sort
2023-08-21	231	Min max	Senior citizens
2023-08-14	230	Separate digits	Count words
2023-08-07	229	Lexicographically ordered	Two out of three
2023-07-31	228	Unique sum	Empty array
2023-07-24	227	Friday 13th	Roman maths
2023-07-17	226	Shuffle strings	Zero array
2023-07-10	225	Max words	Left right sum diff
2023-07-03	224	Special notes	Additive number
2023-06-26	223	Count primes	Box coins
2023-06-19	222	Matching members	Last member
2023-06-12	221	Good strings	Arithmetic subsequences
2023-06-05	220	Common characters	Squareful
2023-05-29	219	Sorted squares	Travel expenditure
2023-05-22	218	Maximum product	Matrix sum
2023-05-15	217	Sorted matrix	Max number
2023-05-08	216	Registration number	Word stickers
2023-05-01	215	Odd one out	Number placement
2023-04-24	214	Rank score	Collect points
2023-04-17	213	Fun sort	Shortest route
2023-04-10	212	Jumping letters	Sequential substrings
2023-04-03	211	Toeplitz matrix	Split same average
2023-03-27	210	Kill and win	Number collision
2023-03-20	209	A 3-letter alphabet	Merging emails
2023-03-13	208	Minimum index sum	Duplicate and missing
2023-03-06	207	Linear words	The H-index for citations
2023-02-27	206	Measuring the gaps	Array pairings
2023-02-20	205	Third highest value	Maximum xor
2023-02-13	204	Uphill or downhill?	Reshape matrix
2023-02-06	203	Special quads	Copy folders
2023-01-30	202	Three odd things	Find the valleys
2023-01-23	201	Missing numbers	Piles of pennies
2023-01-16	200	Arithmetic slices	Seven segment 200
2023-01-09	199	Good pairs	Good triplets
2023-01-02	198	Max gap	Prime count
2022-12-19	196	Pattern 132	Range list
2022-12-12	195	Special integers	Most frequent even
2022-12-07	194	Digital clock	Frequency equalizer
2022-11-28	193	Binary string	Odd string
2022-11-21	192	Binary flip	Equal Distribution
2022-11-14	191	Twice largest	Cute List
2022-11-07	190	Capital detection	Decoded List
2022-10-31	189	Greater character	Array degree
2022-10-24	188	Divisible Pairs	Total Zero
2022-10-17	187	Days together	Magical triplets
2022-10-10	186	Zip list	Unicode makeover
2022-10-03	185	Mac address	Mask code
2022-09-26	184	Sequence number	Split array
2022-09-19	183	Unique array	Date difference
2022-09-12	182	Max index	Common path
2022-09-05	181	Sentence order	Hot day
2022-08-15	178	Quater-imaginary base	Business date
2022-08-08	177	Damm algorithm	Palindromic prime cyclops
2022-08-01	176	Permuted multiples	Reversible numbers
2022-07-25	175	Last Sunday	Perfect totient numbers
2022-07-18	174	Disarium numbers	Permutation ranking
2022-07-11	173	Esthetic number	Sylvester’s sequence
2022-07-04	172	Prime partition	Five-number summary
2022-06-27	171	Abundant number
2022-06-20	170	Primorial numbers	Kronecker product
2022-06-13	169	Brilliant numbers	Achilles numbers
2022-06-06	168	Perrin prime	Home prime
2022-05-30	167	Circular prime	Gamma function
2022-05-23	166	Hexadecimal words	K-directory diff
2022-05-16	165	Scalable vector graphics	Line of best fit
2022-05-09	164	Prime palindrome	Happy numbers
2022-05-02	163	Sum bitwise operator	Summations
2022-04-25	162	ISBN-13	Wheatstone-Playfair
2022-04-18	161	Abecedarian words	Pangrams
2022-04-11	160	Four is magic	Equilibrium index
2022-03-28	158	Additive primes	First series Cuban primes
2022-03-21	157	Pythagorean means	Brazilian number
2022-03-14	156	Pernicious numbers	Weird number
2022-03-07	155	Fortunate numbers	Pisano period
2022-02-28	154	Missing permutation	Padovan primes
2022-02-21	153	Left factorials	Factorions
2022-02-14	152	Triangle sum path	Rectangle area
2022-02-07	151	Binary tree depth	Rob the house
2022-01-31	150	Fibonacci words	Square-free integer
2022-01-24	149	Fibonacci digit sum	Largest square
2022-01-17	148	Eban numbers	Cardano triplets
2022-01-10	147	Truncatable prime	Pentagon numbers
2022-01-03	146	10001st prime number	Curious fraction tree
2021-12-27	145	Dot product	Palindromic tree
2021-12-20	144	Semiprime	Ulam sequence
2021-12-13	143	Calculator	Stealthy number
2021-12-06	142	Divisor last digit	Sleep sort
2021-11-29	141	Number divisors	Like numbers
2021-11-22	140	Add binary	Multiplication table
2021-11-15	139	JortSort	Long primes
2021-11-08	138	Workdays	Split number
2021-10-18	135	Middle 3-digits	Validate SEDOL

Note: Occasionally older 'try it' buttons don't work, because of later changes to the way this website works. If you let me know (email link) I will (try to) fix them.

The weekly challenge
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