/in/foo.cc: In function 'int K_th(int, int, int)':
/in/foo.cc:43:12: warning: unused variable 'j' [-Wunused-variable]
   43 |     int i, j;
      |            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:76:17: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[1]' [-Wformat=]
   76 |         scanf("%s", &ch);
      |                ~^   ~~~
      |                 |   |
      |                 |   char (*)[1]
      |                 char*
/in/foo.cc:68:12: warning: unused variable 'j' [-Wunused-variable]
   68 |     int i, j, x, y;
      |            ^