foo.c: In function 'main':
foo.c:18:14: error: conflicting types for 's'; have 'char[100000]'
   18 |         char s[100000] = { 0 };
      |              ^
foo.c:14:13: note: previous declaration of 's' with type 'int'
   14 |         int s, n;
      |             ^
foo.c:44:24: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   44 |         int k; scanf("%d", k);
      |                       ~^   ~
      |                        |   |
      |                        |   int
      |                        int *
foo.c:18:14: warning: unused variable 's' [-Wunused-variable]
   18 |         char s[100000] = { 0 };
      |              ^

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