/in/foo.cc: In function 'int w(int, int, int)':
/in/foo.cc:8:6: warning: unused variable 'm' [-Wunused-variable]
  int m;
      ^
/in/foo.cc:9:6: warning: variable 'shu' set but not used [-Wunused-but-set-variable]
  int shu[101][101][101];
      ^~~