Dada una cadena Sy una lista de índices X, modifique Seliminando el elemento en cada índice de Smientras usa ese resultado como el nuevo valor de S.

Por ejemplo, dado S = 'codegolf'y X = [1, 4, 4, 0, 2],

0 1 2 3 4 5 6 7  |
c o d e g o l f  |  Remove 1
c d e g o l f    |  Remove 4
c d e g l f      |  Remove 4
c d e g f        |  Remove 0
d e g f          |  Remove 2
d e f

Su tarea es realizar este proceso, recopilar los valores de Sdespués de cada operación y mostrarlos en una nueva línea en orden. La respuesta final sería

S = 'codegolf'
X = [1, 4, 4, 0, 2]

Answer:

codegolf
cdegolf
cdeglf
cdegf
degf
def

• Este es el código de golf, así que haga su código lo más corto posible.
• Puede suponer que los valores en Xson siempre índices válidos para S, y puede usar indexación basada en 0 o en 1.
• La cadena solo contendrá [A-Za-z0-9]
• Cualquiera So xpuede por vacío. Si Sestá vacío, se deduce que xtambién debe estar vacío.
• También puede tomar Scomo una lista de caracteres en lugar de una cadena.
• Puede imprimir el resultado o devolver una lista de cadenas. Los espacios en blanco iniciales y finales son aceptables. Cualquier forma de salida está bien siempre que sea fácil de leer.

Casos de prueba

S = 'abc', x = [0]
'abc'
'bc'

S = 'abc', x = []
'abc'

S = 'abc', x = [2, 0, 0]
'abc'
'ab'
'b'
''

S = '', x = []
''

S = 'codegolfing', x = [10, 9, 8, 3, 2, 1, 0]
'codegolfing'
'codegolfin'
'codegolfi'
'codegolf'
'codgolf'
'cogolf'
'cgolf'
'golf'

Haskell, 38 33 bytes

s#i=take i s++drop(i+1)s
scanl(#)

Directo: tome repetidamente los elementos antes y después del índice i, vuelva a unirlos y recopile los resultados.

Pruébalo en línea!

Editar: @Lynn guardó 5 bytes. ¡Gracias!

JavaScript (ES6), 57 50 48 45 42 bytes

Toma la cadena como una matriz de caracteres individuales, genera una matriz que contiene una cadena separada por comas del original, seguida de una submatriz de cadenas separadas por comas para cada paso.

s=>a=>[s+"",a.map(x=>s.splice(x,1)&&s+"")]

• 3 bytes guardados gracias a Arnauld sugiriendo que abusé de la especificación de salida suelta más de lo que ya era, lo que me llevó a abusar aún más para otro ahorro de 3 bytes.

Pruébalo

o.innerText=JSON.stringify((f=

s=>a=>[s+"",a.map(x=>s.splice(x,1)&&s+"")]

)([...i.value="codegolf"])(j.value=[1,4,4,0,2]));oninput=_=>o.innerText=JSON.stringify(f([...i.value])(j.value.split`,`))

label,input{font-family:sans-serif;font-size:14px;height:20px;line-height:20px;vertical-align:middle}input{margin:0 5px 0 0;width:100px;}

<label for=i>String: </label><input id=i><label for=j>Indices: </label><input id=j><pre id=o>

Explicación

Tomamos las dos entradas a través de parámetros s(la matriz de cadenas) y a(la matriz de enteros) en sintaxis de curry, lo que significa que llamamos a la función con f(s)(a).

Construimos una nueva matriz y comenzamos con la original s. Sin embargo, como el splicemétodo que usaremos más adelante modifica una matriz, necesitamos hacer una copia de ella, lo que podemos hacer convirtiéndola en una cadena (simplemente agregue una cadena vacía).

Para generar la submatriz, pasamos por mapencima de la matriz de enteros a(donde xes el entero actual) y, para cada elemento, tomamos splice1 elemento desde s, comenzando en el índice x. Devolvemos el modificado s, nuevamente haciendo una copia convirtiéndolo en una cadena.

Japt , 6 bytes

åjV uV

¡Pruébelo en línea!

Explicación

UåjV uV   Implicit: U = array of integers, V = string
Uå        Cumulatively reduce U by
  j         removing the item at that index in the previous value,
   V        with an initial value of V.
     uV   Push V to the beginning of the result.

Alternativamente:

uQ åjV

UuQ       Push a quotation mark to the beginning of U.
    å     Cumulatively reduce by
     j      removing the item at that index in the previous value,
      V     with an initial value of V.

Esto funciona porque eliminar el elemento en el índice "no hace nada y, por lo tanto, devuelve la cadena original.

Cáscara , 7 bytes

G§+oh↑↓

Primero toma la cadena, luego los índices (basados ​​en 1). Pruébalo en línea!

Explicación

G§+oh↑↓
G        Scan from left by function:
           Arguments are string, say s = "abcde", and index, say i = 3.
      ↓    Drop i elements: "de"
     ↑     Take i elements
   oh      and drop the last one: "ab"
 §+        Concatenate: "abde"
         Implicitly print list of strings on separate lines.

Python 2 , 43 bytes

s,i=input()
for i in i+[0]:print s;s.pop(i)

Pruébalo en línea!

Cualquier forma de salida está bien siempre que sea fácil de leer.

Entonces esto se imprime como listas de caracteres.

Python 2 , 47 bytes

Esto podría acortarse a 43 bytes , como señaló @LuisMendo, pero esa ya es la solución de @ ErktheOutgolfer.

a,b=input();print a
for i in b:a.pop(i);print a

Pruébalo en línea!

Java 8, 78 bytes

Esta es una lambda al curry, de int[]a un consumidor de StringBuildero StringBuffer. La salida se imprime a la salida estándar.

l->s->{System.out.println(s);for(int i:l)System.out.println(s.delete(i,i+1));}

Pruébalo en línea

05AB1E , 11 bytes

v=ā0m0yǝÏ},

Pruébalo en línea!

v           # For each index:
 =          #   Print without popping
  ā         #   Push range(1, len(a) + 1)
   0m       #   Raise each to the power of 0. 
            #   This gives a list of equal length containing all 1s
     0yǝ    #   Put a 0 at the location that we want to remove
        Ï   #   Keep only the characters that correspond to a 1 in the new list
         }, # Print the last step

Mathematica, 70 bytes

(s=#;For[t=1,t<=Length@#2,Print@s;s=StringDrop[s,{#2[[t]]+1}];t++];s)&

Pruébalo en línea!

R , 46 32 bytes

function(S,X)Reduce(`[`,-X,S,,T)

Pruébalo en línea!

Toma la entrada como una lista de caracteres y Xestá basada en 1. Reducees el equivalente R de fold, la función en este caso es [cuál es el subconjunto. Se repite -Xporque la indexación negativa en R elimina el elemento y initse establece en S, con accum=TRUElo que acumulamos los resultados intermedios.

R , 80 bytes

function(S,X,g=substring)Reduce(function(s,i)paste0(g(s,0,i-1),g(s,i+1)),X,S,,T)

2-argument function, takes X 1-indexed. Takes S as a string.

Try it online!

Haskell, 33 bytes

scanl(\s i->take i s++drop(i+1)s)

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PowerShell, 94 84 bytes

param($s,$x)$a=[Collections.Generic.list[char]]$s;$x|%{-join$a;,$a|% r*t $_};-join$a

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Takes input $s as a string and $x as an explicit array. We then create $a based on $s as a list.

Arrays in PowerShell are fixed size (for our purposes here), so we need to use the lengthy [System.Collections.Generic.list] type in order to get access to the .removeAt() function, which does exactly what it says on the tin.

I sacrificed 10 bytes to include two -join statements to make the output pretty. OP has stated that outputting a list of chars is fine, so I could output just $a rather than -join$a, but that's really ugly in my opinion.

Saved 10 bytes thanks to briantist.

Python 2, 50 bytes

• Takes in string and list of indices

s,i=input()
for j in i+[0]:print s;s=s[:j]+s[j+1:]

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05AB1E, 9 7 bytes

=svõyǝ=

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=s        # Print original string, swap with indices.
  v       # Loop through indices...
   õyǝ    # Replace current index with empty string.

-2 thanks to idea from @ETHProductions.

Retina, 58 bytes

¶\d+
¶¶1$&$*
+1`(?=.*¶¶.(.)*)(((?<-1>.)*).(.*)¶)¶.*
$2$3$4

Try it online! Explanation:

¶\d+

Match the indices (which are never on the first line, so are always preceded by a newline).

¶¶1$&$*

Double-space the indices, convert to unary, and add 1 (because zeros are hard in Retina).

+1`

Repeatedly change the first match, which is always the current value of the string.

   (?=.*¶¶.(.)*)

Retrieve the next index in $#1.

                (           .    ¶)

Capture the string, including the $#1th character and one newline.

                 ((?<-1>.)*) (.*)

Separately capture the prefix and suffix of the $#1th character of the string.

                                   ¶.*

Match the index.

$2$3$4

Replace the string with itself and the index with the prefix and suffix of the $#1th character.

Pyth, 8 bytes

.u.DNYEz

Demonstration

Reduce, starting with the string and iterating over the list of indices, on the deletion function.

PowerShell, 54 58 bytes

param($s,$x),-1+$x|%{$z=$_;$i=0;-join($s=$s|?{$z-ne$i++})}

Try it online!

Explanation

Takes input as a char array ([char[]]).

Iterates through the array of indices ($x) plus an injected first element of -1, then for each one, assigns the current element to $z, initializes $i to 0, then iterates through the array of characters ($s), returning a new array of only the characters whose index ($i) does not equal (-ne) the current index to exclude ($z). This new array is assigned back to $s, while simultaneously being returned (this happens when the assignment is done in parentheses). That returned result is -joined to form a string which is sent out to the pipeline.

Injecting -1 at the beginning ensures that the original string will be printed, since it's the first element and an index will never match -1.

q/kdb+, 27 10 bytes

Solution:

{x _\0N,y}

Examples:

q){x _\0N,y}["codegolf";1 4 4 0 2]
"codegolf"
"cdegolf"
"cdeglf"
"cdegf"
"degf"
"def"
q){x _\0N,y}["abc";0]
"abc"
"bc"
q){x _\0N,y}["abc";()]
"abc"
q){x _\0N,y}["abc";2 0 0]
"abc"
"ab"
,"b"
""    
q){x _\0N,y}["";()]
""

Explanation:

Takes advantage of the converge functionality \ as well as drop _.

{x _\0N,y}
{        } / lambda function, x and y are implicit variables
     0N,y  / join null to the front of list (y), drop null does nothing
   _\      / drop over (until result converges) printing each stage
 x         / the string (need the space as x_ could be a variable name)

Notes:

If we didn't need to print the original result, this would be 2 bytes in q:

q)_\["codegolfing";10 9 8 3 2 1 0]
"codegolfin"
"codegolfi"
"codegolf"
"codgolf"
"cogolf"
"cgolf"
"golf"

Perl 5, 55 bytes (54 + "-l")

sub{print($s=shift);for(@_){substr$s,$_,1,"";print$s}}

Try it online!

MATL, 8 bytes

ii"t[]@(

Indexing is 1-based.

Try it online! Or verify the test cases.

Explanation

i      % Input string. Input has to be done explicitly so that the string
       % will be displayed even if the row vector of indices is empty
i      % Input row vector of indices
"      % For each
  t    %   Duplicate current string
  []   %   Push empty array
  @    %   Push current index
  (    %   Assignment indexing: write [] to string at specified index
       % End (implicit). Display stack (implicit)

C# (.NET Core), 87 87 74 70 bytes

S=>I=>{for(int i=0;;S=S.Remove(I[i++],1))System.Console.WriteLine(S);}

Try it online!

Just goes to show that recursion isn't always the best solution. This is actually shorter than my original invalid answer. Still prints to STDOUT rather than returning, which is necessary because it ends with an error.

-4 bytes thanks to TheLethalCoder

C (gcc), 99 bytes

j;f(s,a,i)char*s;int*a;{puts(s);for(j=0;j<i;j++){memmove(s+a[j],s+a[j]+1,strlen(s)-a[j]);puts(s);}}

Try it online!

Takes the string, array, and the length of the array.

Pyth, 10 bytes

Rule changes saved me 1 byte:

V+E0Q .(QN

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Pyth, 11 bytes

V+E0sQ .(QN

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Gaia, 9 bytes

+⟪Seḥ+⟫⊣ṣ

^{I should really add a "delete at index" function...}

Try it online!

Explanation

+          Add the string to the list
 ⟪Seḥ+⟫⊣   Cumulatively reduce by this block:
  S         Split around index n
   e        Dump the list
    ḥ       Remove the first char of the second part
     +      Concatenate back together
        ṣ  Join the result with newlines

V, 12 bytes

òdt,GÙ@-|xHx

Try it online!

This is 1-indexed, input is like:

11,10,9,4,3,2,1,
codegolfing

Explanation

ò              ' <M-r>ecursively until error
 dt,           ' (d)elete (t)o the next , (errors when no more commas)
    G          ' (G)oto the last line
     Ù         ' Duplicate it down
        |      ' Goto column ...
      @-       ' (deleted number from the short register)
         x     ' And delete the character there
          H    ' Go back home
           x   ' And delete the comma that I missed

Swift 3, 80 bytes

func f(l:[String],c:[Int]){var t=l;for i in c{print(t);t.remove(at:i)};print(t)}

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Pyth, 8 bytes

+zm=z.Dz

Test suite!

explanation

+zm=z.DzdQ    # implicit: input and iteration variable
  m      Q    # for each of the elements of the first input (the array of numbers, Q)
     .Dzd     # remove that index from the second input (the string, z)
   =z         # Store that new value in z
+z            # prepend the starting value

Python 2, 54

X,S=input()
for a in X:
    print S
    S=S[:a]+S[a+1:]
print S

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APL, 31 30 28 bytes

{⎕←⍺⋄⍵≡⍬:⍬⋄⍺[(⍳⍴⍺)~⊃⍵]∇1↓⍵}

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C# (Mono), 85 bytes

s=>a=>{for(int i=-2;++i<a.Count;)System.Console.WriteLine(s=i<0?s:s.Remove(a[i],1));}

Try it online!