/in/foo.cc: In function 'int main()':
/in/foo.cc:10:48: error: 'cj' was not declared in this scope; did you mean 'j'?
   10 |                         if(ch[i]<ch[j]||ch[i]==cj[j]&&ma[i]<ma[j]){
      |                                                ^~
      |                                                j
/in/foo.cc:13:38: error: 'mx' was not declared in this scope; did you mean 'ma'?
   13 |                                 swap(mx[i],ma[j]);
      |                                      ^~
      |                                      ma