foo.cc: In function ‘int main()’:
foo.cc:13:49: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   13 |                         if(a[i]<a[j]||a[i]==a[j]&&b[i]>b[j])
      |                                       ~~~~~~~~~~^~~~~~~~~~~
foo.cc:23:34: error: expected primary-expression before ‘;’ token
   23 |                 for(int j=i-1;j<=;j++)
      |                                  ^