foo.cc: In function 'bool ok_()':
foo.cc:10:17: warning: array subscript has type 'char' [-Wchar-subscripts]
   10 |         if(t[a[i]]==-1||t[b[i]]==-1||t[c[i]]==-1)continue;
      |              ~~~^
foo.cc:10:30: warning: array subscript has type 'char' [-Wchar-subscripts]
   10 |         if(t[a[i]]==-1||t[b[i]]==-1||t[c[i]]==-1)continue;
      |                           ~~~^
foo.cc:10:43: warning: array subscript has type 'char' [-Wchar-subscripts]
   10 |         if(t[a[i]]==-1||t[b[i]]==-1||t[c[i]]==-1)continue;
      |                                        ~~~^
foo.cc:11:18: warning: array subscript has type 'char' [-Wchar-subscripts]
   11 |         if((t[a[i]]+t[b[i]])%n!=t[c[i]])
      |               ~~~^
foo.cc:11:26: warning: array subscript has type 'char' [-Wchar-subscripts]
   11 |         if((t[a[i]]+t[b[i]])%n!=t[c[i]])
      |                       ~~~^
foo.cc:11:38: warning: array subscript has type 'char' [-Wchar-subscripts]
   11 |         if((t[a[i]]+t[b[i]])%n!=t[c[i]])
      |                                   ~~~^
foo.cc:13:22: warning: array subscript has type 'char' [-Wchar-subscripts]
   13 |             if((t[a[i]]+t[b[i]]+1)%n!=t[c[i]])return 0;
      |                   ~~~^
foo.cc:13:30: warning: array subscript has type 'char' [-Wchar-subscripts]
   13 |             if((t[a[i]]+t[b[i]]+1)%n!=t[c[i]])return 0;
      |                           ~~~^
foo.cc:13:44: warning: array subscript has type 'char' [-Wchar-subscripts]
   13 |             if((t[a[i]]+t[b[i]]+1)%n!=t[c[i]])return 0;
      |                                         ~~~^
foo.cc: In function 'void Try_()':
foo.cc:23:20: warning: array subscript has type 'char' [-Wchar-subscripts]
   23 |         int s=t[a[i]]+t[b[i]]+jw;
      |                 ~~~^
foo.cc:23:28: warning: array subscript has type 'char' [-Wchar-subscripts]
   23 |         int s=t[a[i]]+t[b[i]]+jw;
      |                         ~~~^
foo.cc:24:17: warning: array subscript has type 'char' [-Wchar-subscripts]
   24 |         if(t[c[i]]!=s%n)return ;
      |              ~~~^
foo.cc: In function 'int main()':
foo.cc:51:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   51 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~
foo.cc:52:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   52 |     scanf("%s%s%s",a+1,b+1,c+1);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~

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