The weekly challenge
My solutions by week
My solutions by week
'Try it' not working? See note below.
Week 225 - 10 July 2023 - Counting words and subtracting numbers
• Task 2 - Left right sum diff
Week 224 - 3 July 2023 - Strings and sequences
Week 223 - 26 June 2023 - Counting primes and maximising cash
Week 222 - 19 June 2023 - Members’ week
Week 221 - 12 June 2023 - Good strings and hidden sequences
• Task 2 - Arithmetic subsequences
Week 220 - 5 June 2023 - Common characters and squareful sequences
Week 219 - 29 May 2023 - Any more fares, please?
Week 218 - 22 May 2023 - Multiply three and binary matrix
Week 217 - 15 May 2023 - Sorted them both
Week 216 - 8 May 2023 - Alphabetical exercises
• Task 1 - Registration number
Week 215 - 1 May 2023 - Adopt a chilly ghost
Week 214 - 24 April 2023 - All about points
Week 213 - 17 April 2023 - Evens go first and untangling the route
Week 212 - 10 April 2023 - Lead to Gold and 1 2 3
• Task 2 - Sequential substrings
Week 211 - 3 April 2023 - Striped arrays and balanced splits
Week 210 - 27 March 2023 - Kill and collide!
Week 209 - 20 March 2023 - An abc and @emails
• Task 1 - A 3-letter alphabet
Week 208 - 13 March 2023 - Matching strings and missing numbers
• Task 2 - Duplicate and missing
Week 207 - 6 March 2023 - All on the same line, and am I being cited?
• Task 2 - The H-index for citations
Week 206 - 27 February 2023 - Shortest time and max of mins
Week 205 - 20 February 2023 - Third highest and maximum xor
• Task 1 - Third highest value
Week 204 - 13 February 2023 - Climbing or falling and reshaping the matrix
• Task 1 - Uphill or downhill?
Week 203 - 6 February 2023 - Quads and directory enquiries
Week 202 - 30 January 2023 - Three odd things in the valleys
Week 201 - 23 January 2023 - Missing numbers and piles of pennies
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.
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Campbell Smith under a
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