foo.cc: In function 'int main()':
foo.cc:40:9: warning: unused variable 'j' [-Wunused-variable]
   40 |  int i, j, x, y, ans;
      |         ^
foo.cc:41:7: warning: unused variable 'c' [-Wunused-variable]
   41 |  char c;
      |       ^
foo.cc:42:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   42 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:46:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   46 |    scanf("%d",&a[i]);
      |    ~~~~~^~~~~~~~~~~~
foo.cc:49:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   49 |   scanf("%d",&m);
      |   ~~~~~^~~~~~~~~
foo.cc:53:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   53 |     scanf("%d%d",&x,&y);
      |     ~~~~~^~~~~~~~~~~~~~

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