list of classical problems
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| ID | NAME | CODE | USERS | ACC % |
|---|---|---|---|---|
| 34021 | Prefix Square Free Words | PSFWORDS | 8 | 28.57 |
| 34032 | Chiaki With Intervals | INTDSET | 13 | 54.84 |
| 34063 | Chiaki With Intervals (Easy) | INTDSET2 | 9 | 50.00 |
| 34096 | Counting Divisors (general) | DIVCNTK | 307 | 34.74 |
| 34103 | Chiaki Sequence | A001856 | 10 | 23.21 |
| 34112 | The Sum of Unitary Divisors | UDIVSUM | 57 | 32.20 |
| 34117 | Just a Palindrome | JUSTAPAL | 27 | 8.67 |
| 34127 | Gray Code and Twos Complement | GCATC | 14 | 11.18 |
| 35582 | Fibonacci Power Sum (hard) | FIBPSUM2 | 13 | 27.42 |
| 35631 | Moon Safari (Extreme) | MOON4 | 9 | 20.94 |
| 35674 | COLORFUL ARRAY | CLFLARR | 1505 | 41.50 |
| 35675 | Primes in GCD Table (Hard) | PGCD2 | 9 | 30.77 |
| 35716 | Trending GCD (Hard) | TGCD2 | 14 | 43.24 |
| 36533 | Gentleman s Wallet | VZLA2019G | 52 | 40.96 |
| 37375 | Kingdom of Equality | KEQUALITY | 10 | 24.62 |
| 38331 | Comet Number | CPDUEL5A | 75 | 31.70 |
| 39219 | Brenden Politeness Filter | BPF1 | 44 | 46.28 |
| 39786 | Selling Greeting Cards | SLNCRD | 87 | 24.36 |
| 41823 | Martia Auris 3020 | MARTIA_AURIS | 5 | 43.75 |
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