foo.c: In function 'main':
foo.c:38:14: error: conflicting types for 's'; have 'char[200000]'
   38 |         char s[200000];
      |              ^
foo.c:37:14: note: previous declaration of 's' with type 'char[100000]'
   37 |         char s[100000];
      |              ^
foo.c:44:26: error: 'r' undeclared (first use in this function)
   44 |         Match(s, n1, n2, r);
      |                          ^
foo.c:44:26: note: each undeclared identifier is reported only once for each function it appears in

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