answer.code:5:8: error: ‘MAXLENS’ was not declared in this scope; did you mean ‘MAX_LENS’?
    5 | char n[MAXLENS];
      |        ^~~~~~~
      |        MAX_LENS
answer.code: In function ‘int main()’:
answer.code:11:6: error: ‘n’ was not declared in this scope; did you mean ‘yn’?
   11 | cin>>n;
      |      ^
      |      yn
answer.code:15:4: error: ‘s’ was not declared in this scope
   15 | if(s[i]!=s[len-i-1])++ans;
      |    ^
answer.code:17:16: error: expected ‘;’ before ‘}’ token
   17 | cout<<ans<<"\n"
      |                ^
      |                ;
   18 | }
      | ~