钢琴键的宽度为3个字符，高度为7个字符。但是，如果每个键都为3个字符宽，则黑色键的空间将不足。这就是为什么某些白色键的某些部分被切掉的原因。白键有3种类型。

缺少右半（R）的键：

____
|  |
|  |
|  |
|  |
|   |
|   |
|___|

左半边缺少的键（L）：

 ____
 |  |
 |  |
 |  |
 |  |
|   |
|   |
|___|

以及缺少左右两半的键（M）：

 ___
 | | 
 | | 
 | | 
 | | 
|   |
|   |
|___|

在真正的键盘上，这些模式如下所示：

RMLRMML, RMLRMML, RMLRMML...

并重复总共88个按键。现在，当各个按键分别显示时，您将看不到它，但是将它们推在一起时，您可以看到黑色按键。

_________________________________________________________
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|___|___|___|___|___|___|___|___|___|___|___|___|___|___|

你的任务

给定正整数N，用N个白键打印钢琴的ASCII码。您应该能够处理从1到52（含）之间的任何N（因为实际的88键钢琴具有52个白键）。这是从1到8的测试输出，然后模式以类似的方式增加。

1
____
|  |
|  |
|  |
|  |
|   |
|   |
|___|

2
________
|  | | |
|  | | |
|  | | |
|  | | |
|   |   |
|   |   |
|___|___|

3
_____________
|  | | | |  |
|  | | | |  |
|  | | | |  |
|  | | | |  |
|   |   |   |
|   |   |   |
|___|___|___|

4
________________
|  | | | |  |  | 
|  | | | |  |  | 
|  | | | |  |  | 
|  | | | |  |  | 
|   |   |   |   |
|   |   |   |   |
|___|___|___|___|

5
____________________
|  | | | |  |  | | | 
|  | | | |  |  | | | 
|  | | | |  |  | | | 
|  | | | |  |  | | | 
|   |   |   |   |   |
|   |   |   |   |   |
|___|___|___|___|___|

6
________________________
|  | | | |  |  | | | | | 
|  | | | |  |  | | | | | 
|  | | | |  |  | | | | | 
|  | | | |  |  | | | | | 
|   |   |   |   |   |   |
|   |   |   |   |   |   |
|___|___|___|___|___|___|

7
_____________________________
|  | | | |  |  | | | | | |  |
|  | | | |  |  | | | | | |  |
|  | | | |  |  | | | | | |  |
|  | | | |  |  | | | | | |  |
|   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |
|___|___|___|___|___|___|___|

8
________________________________ 
|  | | | |  |  | | | | | |  |  | 
|  | | | |  |  | | | | | |  |  | 
|  | | | |  |  | | | | | |  |  | 
|  | | | |  |  | | | | | |  |  | 
|   |   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |   |
|___|___|___|___|___|___|___|___|

最后但并非最不重要的是，这是完整的52键输出：

_________________________________________________________________________________________________________________________________________________________________________________________________________________
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |
|  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |  | | | | | |  |  | | | |  |
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |
|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|___|

禁止使用标准漏洞，以字节为单位的最短答案将获胜！

Pyth，68 65 63字节

*lJ:+\|s@Lj;*L" |"_j4536 7*4Q" $"k\_jb+*4]J*2]K+\|*Q"   |":Kd\_

在线尝试！

测试套件。

在此版本中，我只替换了内部的分配（J和K）以节省2个字节。因此，请阅读以下版本。

先前的65字节版本及其说明

J:+\|s@Lj;*L" |"_j4536 7*4Q" $"kK+\|*Q"   |"*lJ\_jb+*4]J*2]K:Kd\_

在线尝试！

J:+\|s@Lj;*L" |"_j4536 7*4Q" $"k    This part generates the most irregular line.

        j;*L" |"_j4536 7            Generate the whole line by black magic
      @L                *4Q         Get the first (4*input) characters of it, with wrapping.
  +\|                               Add "|" in front of it (we took away the first "|")
 :                         " $"k    Replace the ending space by nothing
J                                   Store the line to J.


K+\|*Q"   |"      This part generates the line just below the irregular line.
    *Q"   |"      Repeat "   |" input times
 +\|              Prepend "|"
K                 Store to K


*lJ\_     Now we can actually start printing

*  \_     Repeat "_" ...
 lJ                      [the length of J] times
          (and implicitly print it out)


jb+*4]J*2]K

   *4]J             Repeat J 4 times
       *2]K         Repeat K 2 times
  +                 Concatenate them together
jb                  Join with newlines
                    (and implicitly print it out)

:Kd\_

:K      Replace in K
  d                  " "
   \_                    by "_"
        (and implicitly print it out)

黑魔法

We find the irregular line from input=7, and cut out the first "|":
"  | | | |  |  | | | | | |  |"
 2  1 1 1 2  2  1 1 1 1 1 2

j;*L" |"_j4536 7    Black magic.

         j4536 7    4536 converted to base 7: [1,6,1,4,0]
        _           Reverse: [0,4,1,6,1]
  *L" |"            Repeat " |" <each element> times:
                    [""," | | | |"," |"," | | | | | |"," |"]
j;                  Join by whitespace:
                    "  | | | |  |  | | | | | |  |"

的JavaScript（ES6），155个 149 147字节

n=>[`_`[r=`repeat`](n*4+(9>>n%7&1)),s=[...Array(n*12/7|0)].map((_,i)=>1998>>i%12&1?` |`:`  |`).join``,s,s,s,s=`   |`[r](n),s,`___|`[r](n)].join`\n|`

其中\n代表文字换行符。利用第一行之后的所有行都以|字符开头的事实。说明：

f=
n=>[                        // Start by building up a list of rows
 `_`[r=`repeat`](n*4+       // 4 underscores per key
  (9>>n%7&1)),              // Third and seventh keys have one extra
 s=[...Array(n*12/7|0)]     // Calculate total of white and black keys
  .map((_,i)=>              // Process each key in turn
   1998>>i%12&1?` |`:`  |`  // Bitmap of narrow and wide keys
  ).join``,                 // Join the keys together
 s,s,s,                     // Repeated 4 times in total
 s=`   |`[r](n),            // Full width part of the white keys
 s,                         // Repeated twice in total
 `___|`[r](n)               // Base of the white keys
].join`\n|`                 // Join the rows together

<input type="number" oninput="o.textContent=f(this.value);"><pre id=o>

编辑：通过修复我对键的高度规范的误读，节省了2个字节。

Ruby，119个字节

->n{puts ?_*(1+n*4+(0<=>-n%7%4)),(0..6).map{|i|("01"+("%b"%[0xAADAAAD,13][i/4]*99)).tr('10',' |_|'[i/6*2,2])[0,1+n*4]}}

取消测试程序

f=->n{
  puts ?_*(1+n*4+(0<=>-n%7%4)),           #Draw 1+n*4 _'s for top row (one less if -n%7%4>0, black note), then...
  (0..6).map{|i|                          #Cycle through remaining 7 rows
    ("01"+("%b"%[0xAADAAAD,13][i/4]*99)).   #Generate string version of binary number corresponding to pattern, repeat 99 times.
    tr('10',' |_|'[i/6*2,2]                 #Binary 1-> space or underscore. Binary 0 -> | (These choices ensured no leading 0)
    )[0,1+n*4]                              #truncate to the right amount of keys.
  }
}


10.times{|j|f[j]}

> <>，188182字节

&0"_"o011.
.\:7%8g95*-"_"o1-:a1@@?.~~~1+:&:&=1+1$
.v~:7=?;ao"|"o1+:0$0$
.>:7%8g"0"-4*:9go1+:9go1+:9go1+9go1+:&:&=3$-1$
 ^
.>"| _"{:}7=?$~::oooo1+:&:&(3*2+1$
>^
^
0120112
  | | | |  |

程序启动时，堆栈上应显示要显示的白键数量。

编辑：我设法通过组合5/6和7行的输出来减少一些字节。先前版本：

&0"_"o011.
.\:7%8g95*-"_"o1-:a1@@?.~~~1+:&:&=1+1$
.v~ao"|"o1+:0$0$.
.>:7%8g"0"-4*:9go1+:9go1+:9go1+9go1+:&:&=3$-1$
 ^
.>"|   "oooo1+:&:&(3*2+1$
 ^
 "|___"oooo1+:&:&=?;
0120112
  | | | |  |

PHP，238字节

$n=$argv[1];$s=str_repeat;echo'_'.$s($a=$s('_',28),$m=($n-$r=$n%7)/7).substr($a,0,$k=4*$r-($r&&$r!=3))."\n",$g='|'.$s($b='  | | | |  |  | | | | | |  |',$m).substr($b,0,$k)."\n",$g,$g,$g,$h='|'.$s('   |',$n)."\n",$h,'|'.$s('___|',$n)."\n";

像往常一样，在代码之前加上<?php，将其放入一个PHP文件（将其命名为keyboard.php），然后使用以下命令运行它：

$ php -d error_reporting=0 keyboard.php 55

另外两个字节可以通过挤压的初始化被保存在PHP7 $n并$s到他们的第一次使用：

echo'_'.($s=str_repeat)($a=$s('_',28),$m=($n-$r=($n=$argv[1])%7)/7).substr($a,0,$k=4*$r-($r&&$r!=3))."\n",$g='|'.$s($b='  | | | |  |  | | | | | |  |',$m).substr($b,0,$k)."\n",$g,$g,$g,$h='|'.$s('   |',$n)."\n",$h,'|'.$s('___|',$n)."\n";

可以在github上找到未发布的代码，测试套件和其他东西。

蟒3 2，191 185 180 182 171 145个 144 133 132字节

def k(n):print"\n|".join(["_"*(4*n+(9>>n%7&1))]+[''.join("   ||"[1998>>j%12&1::2]for j in range(n*12/7))]*4+["   |"*n]*2+["___|"*n])

这可能需要打高尔夫球，但是我已经在代码上摆弄太多了，以至于我可能看不到高尔夫球场在哪里。欢迎任何打高尔夫球的建议。

编辑：误读了按键高度的规格。该错误已修复。

编辑：从Neil的 Javascript答案中借用了Neil的12个关键思想，删除了一些括号，并切换到Python 2以节省11个字节。

编辑：进行了大量更改，以使功能下降到一个for循环。

编辑：现在是程序而不是函数。

编辑：现在print"\n|".join()按照尼尔建议使用以保存11个字节。将程序转回一个保存字节的函数。

C＃1683字节

所以....在看到尼尔在上面的回答后，这真令人尴尬，但是我还是把它贴出来，因为这花了我一段时间（祝福）。我用C＃创建了我的。在“ Fncs”类中，我创建了典型键顺序的数组。然后，我创建了一个函数，该函数可以允许用户基于给定的整数为该数组获取适当的索引。为了编辑单独的行，我创建了一个“ PianoKeyboard”类，其中包含一个字典，该字典存储了代表各个行的多个字符串。最后，我创建了“ DrawKey”函数，该函数将适当的文本追加到各行，而“ GetKeys”函数则返回整个字符串值。

namespace ASCIIPiano{public enum WhiteKeyType{Left,Middle,Right}public static class Fncs{public static WhiteKeyType[] Order{get{return new WhiteKeyType[]{WhiteKeyType.Left,WhiteKeyType.Middle,WhiteKeyType.Right,WhiteKeyType.Left,WhiteKeyType.Middle,WhiteKeyType.Middle,WhiteKeyType.Right};}}public static PianoKeyboard DrawKey(this PianoKeyboard keyboard, WhiteKeyType type){keyboard.Append(1,"_____");if (type == WhiteKeyType.Left){keyboard.Append( 2,"|  | ");keyboard.Append( 3,"|  | ");keyboard.Append( 4,"|  | ");keyboard.Append( 5, "|  | ");}else if (type == WhiteKeyType.Middle){keyboard.Append(2, " | | ");keyboard.Append(3," | | ");keyboard.Append( 4," | | ");keyboard.Append(5," | | ");}else{keyboard.Append( 2," |  |");keyboard.Append(3, " |  |");keyboard.Append(4," |  |");keyboard.Append(5, " |  |");}keyboard.Append(6,"|   |");keyboard.Append(7,"|   |");keyboard.Append(8,"|___|");return keyboard;}public static int GetWhiteKeyIndex(this int number){return number % 7;}public static string GetKeys(this int quantityofwhitekeys){PianoKeyboard keyboard = new PianoKeyboard();for (int i = 0; i < quantityofwhitekeys; i++){WhiteKeyType key=Fncs.Order[i.GetWhiteKeyIndex()];keyboard.DrawKey(key);}return keyboard.TOTALSTRING;}}public class PianoKeyboard{public PianoKeyboard(){}private Dictionary<int, string> lines = new Dictionary<int, string>();public void Append(int index,string value){if (index > 8 || index < 1){throw new Exception("URGH!");}else{if (lines.Keys.Contains(index)){lines[index] += value;}else{lines.Add(index, value);}}}public string TOTALSTRING{get{string returner = "";foreach (int key in lines.Keys){returner += lines[key] + "\n";}return returner;}}}}