/in/foo.cc: In function 'int main()':
/in/foo.cc:28:28: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    }else if(arr[j-1]=arr[j]){
                            ^
/in/foo.cc:38:15: error: expected primary-expression before ']' token
  cout<<M<<ans[]<<endl;
               ^