foo.cc: In function 'int main()':
foo.cc:20:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
     for(int i=1;i<=n;i++)
     ^~~
foo.cc:24:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  printf("%d",Gun);
  ^~~~~~
foo.cc:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&x,&x,&n);
     ~~~~~^~~~~~~~~~~~~~~~~~~
foo.cc:17:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d",&a[i].x,&a[i].y);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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