foo.cc: In function ‘int main()’:
foo.cc:11:49: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   11 |                         if(a[i]<a[j]||a[i]==a[j]&&b[i]>b[j])
      |                                       ~~~~~~~~~~^~~~~~~~~~~
foo.cc:20:17: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
   20 |                 for(int j=i-1;j>=1;j--)
      |                 ^~~
foo.cc:23:25: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
   23 |                         cout<<ans<<endl;
      |                         ^~~~