Activity for Hakerh400
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #284501 |
The output for `("+-","",1)` should be `"++++++++++"` instead of `"++++++"`. Other test cases are ok. (more) |
— | about 3 years ago |
| Comment | Post #284516 |
... by assigning `c.length` to a variable. (more) |
— | about 3 years ago |
| Edit | Post #284500 |
Post edited: |
— | about 3 years ago |
| Edit | Post #284500 | Initial revision | — | about 3 years ago |
| Answer | — |
A: Run-length encode a byte sequence JavaScript (Node.js), 146 bytes f=(a,c=n=(b=d=[],e=x=>x&&(c>191|d>2?b.push(d+192,c):b.push(...d+n?[c,c]:[c]),c=n,d=0)))=>(a.map(b=>c^n?c=(e(d>62|b-c),d++,b):(c=b,d=1)),e(c-n),b) Try it online! Ungolfed version (more) |
— | about 3 years ago |
| Edit | Post #284456 | Initial revision | — | about 3 years ago |
| Answer | — |
A: Find good coalitions [Haskell], 141 bytes import Control.Monad f a=map(map fst)$filter(\c->let{g=map snd;e=sum(g a)`div`2;f=g c;d=sum f}in d>e&&all((<=e).(d-))f)$filterM(pure[1<0..])a Try it online! Explanation: we generate all possible coalitions and then filter out the bad ones. `filterM... (more) |
— | about 3 years ago |
| Edit | Post #284422 |
Post edited: |
— | about 3 years ago |
| Comment | Post #284407 |
*"The returning value is the method that makes the equation true"* - but then you say: *"What to return when it's false? Something but not nothing (whitespaces and newlines aren't allowed as such output)"*. So, what is the type of the return value: a function, or a character? (more) |
— | about 3 years ago |
| Edit | Post #284422 |
Post edited: |
— | about 3 years ago |
| Edit | Post #284422 |
Post edited: |
— | about 3 years ago |
| Edit | Post #284422 |
Post edited: |
— | about 3 years ago |
| Edit | Post #284422 |
Post edited: |
— | about 3 years ago |
| Edit | Post #284422 | Initial revision | — | about 3 years ago |
| Answer | — |
A: Encode and decode floating point integers [Haskell], 219 194 bytes h!n=x n?(a?c$d>n&&(even a?f(x)[0..] (a?b)c|c=a|0<1=b Try it online! Depending on the first argument: False - Encode True - Decode (more) |
— | about 3 years ago |
| Edit | Post #284189 |
Post edited: |
— | about 3 years ago |
| Edit | Post #284268 |
Post edited: |
— | about 3 years ago |
| Comment | Post #284277 |
[67 bytes](https://tio.run/##K6gsycjPM/7/nyvRVikztyC/qEQhqzg/z7qgKDOvRENdM1EjObUi1VpdGySql1KaW1CskagZbWWlaxirrW6bqK6pZA1UkAwU/P8fAA) (more) |
— | about 3 years ago |
| Comment | Post #284271 |
Is an extra new line at the end allowed? (more) |
— | about 3 years ago |
| Edit | Post #284276 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Reverse your quine JavaScript (Node.js), 60 bytes f=a=>console.log(`)(f;${[...f+``].reverse``.join``}=f`);f() Try it online! (more) |
— | over 3 years ago |
| Edit | Post #284275 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Reverse your quine [Haskell], 78 bytes main=putStr$reverse$a++show a where a="main=putStr$reverse$a++show a where a=" Try it online! (more) |
— | over 3 years ago |
| Edit | Post #284268 | Initial revision | — | over 3 years ago |
| Answer | — |
A: The Ludic Numbers [Haskell], 51 49 bytes -2 bytes thanks to Wheat Wizard 1:g[2..] g(a:b)=a:g[d|(c,d)0] Try it online! (more) |
— | over 3 years ago |
| Comment | Post #284191 |
Are function answers allowed? Or does it have to be a full program? (more) |
— | over 3 years ago |
| Comment | Post #284195 |
[42 bytes](https://tio.run/##PcpBCsIwFEXReVbxKAiJjchvZ4UuJrWJBuprSTLpBlyAS@xGok68swN328tjZV9rGBf3nGYHDryI4wxpg@7PbCUG8NT5JXvw2plafC43l33GiOR491osRIxSYU0gIvFfBoVvW4osmhbN8Xo3Fj8FTWOMqh8) (more) |
— | over 3 years ago |
| Edit | Post #284189 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Collatz conjecture; Count the tries to reach $1$ [Haskell], 43 39 bytes f 1=0 f n=1+f([div n 2,n3+1]!!mod n 2) Try it online! (more) |
— | over 3 years ago |
| Edit | Post #284172 |
Post edited: |
— | over 3 years ago |
| Edit | Post #284181 |
Post edited: |
— | over 3 years ago |
| Edit | Post #284181 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Decode periodic decimal fractions [Haskell], 352 bytes f a=let{(d,e)=y$filter(>'-')a;f=drop 1e;g=0!h;h=fst n;i=scanr(:)[]h;(j,k)=elem '.'f%(1!head(filter(\a->a>[]&&elem(a++a)i)i++[[last$'0':h]]));(l,m)=(read('0':d)::Integer,1)#g#(j,ksnd g);n=y f}in(last$l:[-l|elem '-'a],m) y=break([])%(read b,10^length b-a) (a,b)... (more) |
— | over 3 years ago |
| Edit | Post #284172 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Abbreviate everything [Haskell], 139 138 bytes import Data.Char f(a:b)|d a=toUpper a:f(dropWhile(\a->e a"-'"||d a)b)|e a":;"=a:c|e a".?!"=' ':c|0<1=c where c=f b;d=isLetter;e=elem f a=a Try it online! (more) |
— | over 3 years ago |
| Edit | Post #284166 | Initial revision | — | over 3 years ago |
| Article | — |
Play dominoes using strings Challenge Given two lists of strings $A$ and $B$, both of length $n\ge1$. For any $i\in\left\\\{1,\dots,n\right\\\}$, by $Ai$ and $Bi$ we represent the $i$-th string from $A$ and $B$, respectively. Associative infix binary operator $+$ represents string concatenation. Output any $k1,\dots,km$ f... (more) |
— | over 3 years ago |
| Comment | Post #284136 |
`"+2"` is `2/1`, not `2/2`. Also, `".122122..."` is `122/999`, not `211/999` (more) |
— | over 3 years ago |
| Comment | Post #284136 |
`611107811/4950` should be negative. Can you also add `-0`, `-.`, and a few test cases with explicit `+`? (more) |
— | over 3 years ago |
| Edit | Post #284130 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Expand a polynomial [Haskell], 45 bytes foldl(\a b->zipWith((-).(b))(0:a)$a++[0])[1] Try it online! Uses the "highest power first" convention. Sometimes multiplies the polynomial by $(-1)$. (more) |
— | over 3 years ago |
| Edit | Post #284094 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Repeat the characters [Haskell], 18 bytes (.replicate).(>>=) Try it online! (more) |
— | over 3 years ago |
| Edit | Post #284070 | Initial revision | — | over 3 years ago |
| Answer | — |
A: Digit Sum Integer Sequence (working title) [Haskell], 56 bytes f a=a:f(a+g(read.pureshow a)) g a=minimum a+maximum a Try it online! (more) |
— | over 3 years ago |
| Comment | Post #284040 |
Test cases 5, 9 and 10 seem incorrect. (more) |
— | over 3 years ago |
| Edit | Post #284042 |
Post edited: |
— | over 3 years ago |
| Edit | Post #284042 | Initial revision | — | over 3 years ago |
| Answer | — |
A: "Hello, {name}!" [Haskell], 43 35 bytes main=interact$("Hello, "++).(++"!") Try it online! (more) |
— | over 3 years ago |
| Edit | Post #284027 | Initial revision | — | over 3 years ago |