foo.cc: In function 'void work_1(int)':
foo.cc:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     for (int i=1;i<a[now].s.size();i++)
      |                  ~^~~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:41:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   41 |             scanf("%d%d",&a[i].v,&s_n);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~~~
foo.cc:44:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |                 scanf("%d",&a[i].s[j]);
      |                 ~~~~~^~~~~~~~~~~~~~~~~

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