foo.cc: In function 'void calc(int, int, int, int, int)':
foo.cc:73:41: warning: array subscript has type 'char' [-Wchar-subscripts]
   73 |  q[++tail]=node,sam=S[id].son(sam,a[node]);
      |                                   ~~~~~~^
foo.cc:22:25: note: in definition of macro 'son'
   22 | #define son(x,y) son[x][y]
      |                         ^
foo.cc: In function 'void solve(int)':
foo.cc:97:27: warning: array subscript has type 'char' [-Wchar-subscripts]
   97 |  int sam=S[1].son(1,a[node]),len=(s[1][1]==a[node]),last=1;
      |                     ~~~~~~^
foo.cc:22:25: note: in definition of macro 'son'
   22 | #define son(x,y) son[x][y]
      |                         ^
foo.cc:98:12: warning: unused variable 'rec' [-Wunused-variable]
   98 |  long long rec=ans;
      |            ^~~
foo.cc:99:7: warning: unused variable 'flag' [-Wunused-variable]
   99 |  bool flag=0;
      |       ^~~~
foo.cc: In function 'int main()':
foo.cc:128:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  128 |   scanf("%s",a+1);
      |   ~~~~~^~~~~~~~~~
foo.cc:131:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  131 |   scanf("%s",s[0]+1);
      |   ~~~~~^~~~~~~~~~~~~

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