foo.cc: In function 'int main()':
foo.cc:54:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   54 |             scanf("%c",&c);
      |             ~~~~~^~~~~~~~~
foo.cc:56:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   56 |                 scanf("%c",&a[i][j]),f[0][i][j]=oo_min;
      |                 ~~~~~^~~~~~~~~~~~~~~
foo.cc:62:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   62 |             scanf("%d%d%d",&s,&e,&d);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~

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