foo.cc: In function 'bool cmp(part, part)':
foo.cc:14:1: warning: control reaches end of non-void function [-Wreturn-type]
   14 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   20 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
foo.cc:23:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   23 |   scanf("%d%d",&a[i].li,&a[i].wi);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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