foo.cc: In function 'int main()':
foo.cc:15:10: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   15 |     std::sort(ori.begin(), ori.end());
      |          ^~~~
      |          qsort
foo.cc:39:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   39 |         for(int k=0;k<nnum.size();k++) {
      |                     ~^~~~~~~~~~~~

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