As mentioned in the previous reincarnation of this kata, this is a duplicate of https://www.codewars.com/kata/5e74588a25ba6800325e9233. Please create a translation of the linked kata instead.

Random tests generate incorrect strings:

2122221122
1212211111
2122111222
2111222121
2222121121
2121121112

Why is the JS version initial solution contains the solution to the C++ version?

Not only that but all the codes in the JS one are all C++ codes.

• There are no random tests
• Input sizes are too small to enforce proper performance criteria
• Tests require user code to contain using namespace std; to run, this is bad (and it's not recommended to use it in the first place anyway)

This is a duplicate of https://www.codewars.com/kata/5e74588a25ba6800325e9233

• "truss" may not be a familiar word to everybody. just "barn" ? ( or "shed" )
• "free grid nodes": it is not actually specified these are the zeroes in the input.
• diagonal barn orientation is a theoretical possibility. I'm guessing this is not intended.
• the dynamic programming tag and the estimated rank make me think performance requirements should be specified.

You didn't explain about which is the character that indicates free grid. Is it 1 or 0? This must be explained in the description.