foo.cc: In function 'int main()':
foo.cc:21:14: warning: unused variable 'x' [-Wunused-variable]
   21 |  int r,c,i,j,x,y;
      |              ^
foo.cc:21:16: warning: unused variable 'y' [-Wunused-variable]
   21 |  int r,c,i,j,x,y;
      |                ^
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",&r,&c);
      |  ~~~~~^~~~~~~~~~~~~~
foo.cc:26:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |    scanf("%d",&a[i][j]);
      |    ~~~~~^~~~~~~~~~~~~~~

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