/in/foo.cc: In function 'void selectsort()':
/in/foo.cc:10:61: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |                         if(a[j][0]>a[i][0]||a[j][0]==a[i][0]&&a[j][1]<a[i][1]){
      |                                             ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/in/foo.cc:8:21: warning: unused variable 'imin' [-Wunused-variable]
    8 |                 int imin=i;
      |                     ^~~~