/in/foo.cc: In function 'int dfs(int)':
/in/foo.cc:26:40: warning: array subscript has type 'char' [-Wchar-subscripts]
   int e = cnt[r[i] & l[ny] & g[c[i][ny]]];
                                        ^
/in/foo.cc:28:43: warning: array subscript has type 'char' [-Wchar-subscripts]
    int num = pos[r[i] & l[ny] & g[c[i][ny]]];
                                           ^
/in/foo.cc:5:72: warning: array subscript has type 'char' [-Wchar-subscripts]
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                                        ^
/in/foo.cc:30:4: note: in expansion of macro 'update'
    update(i,ny,num)
    ^~~~~~
/in/foo.cc:5:72: warning: array subscript has type 'char' [-Wchar-subscripts]
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                                        ^
/in/foo.cc:32:4: note: in expansion of macro 'update'
    update(i,ny,num)
    ^~~~~~
/in/foo.cc:42:37: warning: array subscript has type 'char' [-Wchar-subscripts]
  for(int t = r[x] & l[y] & g[c[x][y]];t;t ^= lowbit(t)){
                                     ^
/in/foo.cc:5:72: warning: array subscript has type 'char' [-Wchar-subscripts]
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                                        ^
/in/foo.cc:44:3: note: in expansion of macro 'update'
   update(x,y,num)
   ^~~~~~
/in/foo.cc:5:72: warning: array subscript has type 'char' [-Wchar-subscripts]
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                                        ^
/in/foo.cc:46:3: note: in expansion of macro 'update'
   update(x,y,num)
   ^~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:66:18: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     update(i,j,x - 1)
                ~~^~~
/in/foo.cc:5:39: note: in definition of macro 'update'
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                       ^~~
/in/foo.cc:66:18: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     update(i,j,x - 1)
                ~~^~~
/in/foo.cc:5:58: note: in definition of macro 'update'
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                          ^~~
/in/foo.cc:5:72: warning: array subscript has type 'char' [-Wchar-subscripts]
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                                        ^
/in/foo.cc:66:5: note: in expansion of macro 'update'
     update(i,j,x - 1)
     ^~~~~~
/in/foo.cc:66:18: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     update(i,j,x - 1)
                ~~^~~
/in/foo.cc:5:83: note: in definition of macro 'update'
 #define update(x,y,num) r[x] ^= (1 << num),l[y] ^= (1 << num),g[c[x][y]] ^= (1 << num),ans[x * 9 + y] = '0' + num + 1;
                                                                                   ^~~
/in/foo.cc: In function 'int dfs(int)':
/in/foo.cc:22:17: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int nxt = 10,x,y;
                 ^
/in/foo.cc:42:36: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
  for(int t = r[x] & l[y] & g[c[x][y]];t;t ^= lowbit(t)){
                              ~~~~~~^