foo.cc: In function ‘int main()’:
foo.cc:13:61: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
   13 |                         if(a[j][0]>a[i][0]||a[j][0]==a[i][0]&&a[j][1]<a[i][1])
      |                                             ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~