foo.cc: In function ‘int main()’:
foo.cc:12:53: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   12 |                         if(a[i]<a[j] || a[i]==a[j]  && b[i]>b[j])
      |                                         ~~~~~~~~~~~~^~~~~~~~~~~~
foo.cc:9:9: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
    9 |         for(int i=1;i<n;i++)
      |         ^~~
foo.cc:18:17: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
   18 |                 for(int i=1;i<=n;i++)
      |                 ^~~