foo.cc: In function 'int main(int, const char**)':
foo.cc:36:6: warning: unused variable 'n' [-Wunused-variable]
  int n=read(),m=read(),k=read(),t=read();
      ^
foo.cc:34:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("chess.in","r",stdin); 
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
foo.cc:35:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
  freopen("chess.out","w",stdout); 
  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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