foo.cc: In function 'int main()':
foo.cc:52:26: warning: array subscript has type 'char' [-Wchar-subscripts]
   52 |                     used[c] = 0;
      |                          ^
foo.cc:70:29: warning: array subscript has type 'char' [-Wchar-subscripts]
   70 |                 if (used[s[0]])
      |                          ~~~^
foo.cc:77:25: warning: array subscript has type 'char' [-Wchar-subscripts]
   77 |                 used[s[0]] = 1;
      |                      ~~~^
foo.cc:13:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |     scanf("%d", &n);
      |     ~~~~~^~~~~~~~~~
foo.cc:17:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |         scanf("%d", &l);
      |         ~~~~~^~~~~~~~~~
foo.cc:18:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |         scanf("%s", lhz);
      |         ~~~~~^~~~~~~~~~~
foo.cc:31:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   31 |             scanf("%s", s);
      |             ~~~~~^~~~~~~~~
foo.cc:36:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   36 |                     scanf("%s", s);
      |                     ~~~~~^~~~~~~~~
foo.cc:37:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   37 |                     scanf("%s", s);
      |                     ~~~~~^~~~~~~~~
foo.cc:38:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   38 |                     scanf("%s", s);
      |                     ~~~~~^~~~~~~~~
foo.cc:69:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |                 scanf("%s", s);
      |                 ~~~~~^~~~~~~~~
foo.cc:73:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   73 |                     scanf("%s", s);
      |                     ~~~~~^~~~~~~~~
foo.cc:74:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   74 |                     scanf("%s", s);
      |                     ~~~~~^~~~~~~~~
foo.cc:79:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   79 |                 scanf("%s", s1);
      |                 ~~~~~^~~~~~~~~~
foo.cc:80:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |                 scanf("%s", s2);
      |                 ~~~~~^~~~~~~~~~

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