foo.cc: In function 'int main()':
foo.cc:32:26: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   32 |    int cost=(nd==d||x==sx&&y==sy)?0:1;
      |                     ~~~~~^~~~~~~
foo.cc:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |  scanf("%d%d",&n,&m);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:20:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |   for(int j=1; j<=m; j++) scanf("%d",&s[i][j]);
      |                           ~~~~~^~~~~~~~~~~~~~~
foo.cc:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |  scanf("%d%d%d%d",&sx,&sy,&ex,&ey);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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