foo.cc: In function 'int main()':
foo.cc:24:8: warning: unused variable 'i' [-Wunused-variable]
   24 |  int m,i,x,y,s,t,k;
      |        ^
foo.cc:25:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   25 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:28:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   28 |    scanf("%d%d%d",&x,&y,&k);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:32:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   32 |    scanf("%d%d%d%d",&x,&y,&s,&t);
      |    ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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