/in/foo.cc: In function 'int main()':
/in/foo.cc:16:73: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   16 |                         if(stu[j+1][1]>stu[j][1]||stu[j+1][1]==stu[j][1]&&stu[j+1][2]>stu[j][2])
      |                                                   ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~