list of classical problems
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| ID | NAME | CODE | USERS | ACC % |
|---|---|---|---|---|
| 34021 | Prefix Square Free Words | PSFWORDS | 10 | 12.04 |
| 34032 | Chiaki With Intervals | INTDSET | 31 | 44.58 |
| 34063 | Chiaki With Intervals (Easy) | INTDSET2 | 22 | 27.96 |
| 34096 | Counting Divisors (general) | DIVCNTK | 368 | 36.95 |
| 34103 | Chiaki Sequence | A001856 | 13 | 23.94 |
| 34112 | The Sum of Unitary Divisors | UDIVSUM | 91 | 31.09 |
| 34117 | Just a Palindrome | JUSTAPAL | 29 | 8.76 |
| 34127 | Gray Code and Twos Complement | GCATC | 17 | 11.80 |
| 35582 | Fibonacci Power Sum (hard) | FIBPSUM2 | 21 | 39.05 |
| 35631 | Moon Safari (Extreme) | MOON4 | 10 | 33.70 |
| 35674 | COLORFUL ARRAY | CLFLARR | 1779 | 41.32 |
| 35675 | Primes in GCD Table (Hard) | PGCD2 | 14 | 25.27 |
| 35716 | Trending GCD (Hard) | TGCD2 | 17 | 46.15 |
| 36533 | Gentleman s Wallet | VZLA2019G | 58 | 42.05 |
| 37375 | Kingdom of Equality | KEQUALITY | 14 | 40.62 |
| 38331 | Comet Number | CPDUEL5A | 89 | 35.73 |
| 39219 | Brenden Politeness Filter | BPF1 | 46 | 48.00 |
| 39786 | Selling Greeting Cards | SLNCRD | 98 | 25.62 |
| 41823 | Martia Auris 3020 | MARTIA_AURIS | 8 | 45.83 |
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