/in/foo.cc: In function 'int main()':
/in/foo.cc:7:24: error: 'm' was not declared in this scope
    7 |         for(int i=1;i<=m;i++)
      |                        ^
/in/foo.cc:13:53: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   13 |                         if(ch[i]<ch[j]||ch[i]==ch[j]&&ma[i]<ma[j])
      |                                         ~~~~~~~~~~~~^~~~~~~~~~~~~