foo.cc: In function 'int main()':
foo.cc:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("escape.in","r",stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
foo.cc:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen("escape.out","w",stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
foo.cc:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&m,&n,&D);
     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:16:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for(int i=1;i<=m;++i)scanf("%s",s[i]+1);
                          ~~~~~^~~~~~~~~~~~~

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