/in/foo.cc: In function 'int main()':
/in/foo.cc:91:8: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%.3lf", dfs(x, y, pow[K] - 1, H));
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:91:8: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]