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Write a program or function that takes in a positive integer (via stdin, command line, or function arg) and prints or returns a string of that many of these small triangles tiled together, alternating which way they point:

 /\ /__\

This sole triangle is the output if the input is 1.

If the input is 2, the output is

 ____ /\ / /__\/

If the input is 3, the output is

 ____ /\ /\ /__\/__\

If the input is 4, the output is

 ________ /\ /\ / /__\/__\/

And so on. Your program must support inputs up to 216 - 1 = 65535.

Details

  • The leftmost triangle always points upwards.
  • There may be trailing spaces but there may not be unnecessary leading spaces.
  • There may be an optional trailing newline.
  • Note that for 1 the output is two lines long but otherwise it's three. This is required.
  • The shortest submission in bytes wins.
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32 Answers 32

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C# (.NET Core), 151 bytes

Without LINQ - 3 string array.

Like most of these, this fails if the integer goes over the max char count per line for stdout.

p=>{var s=new string[3]{ " ","",""};for(var j=0;j< p;){if(j++%2<1){s[1]+=j==p-1?@" /":@" /\ ";s[2]+=j==p-1?@"/":@"/__\";}else s[0]+="____";}return s;}

Try it online!

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Retina, 88 bytes

K` ____¶ /\ /¶/__\/ %`....$ $+*$& %`(.+)\1$ $1 ( (____)*)__(¶.*) /(¶.*)/ $1$3$4 G`\S

Try it online! Explanation:

K` ____¶ /\ /¶/__\/

Replace the input with a pair of triangles.

%`....$ $+*$&

Multiply the triangles by the original input.

%`(.+)\1$ $1

Divide the triangles by 2.

( (____)*)__(¶.*) /(¶.*)/ $1$3$4

Remove the left-over half triangle.

G`\S

Remove the first line if it is now blank.

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