foo.cc: In function 'int main()':
foo.cc:36:9: error: 'PVS {aka struct std::pair<std::vector<int>, std::__cxx11::basic_string<char> >}' has no member named 'push_back'
    p[i].push_back(*q - '0');
         ^~~~~~~~~
foo.cc:39:2: error: 'sort' was not declared in this scope
  sort(p, p + n, cmp);
  ^~~~
foo.cc:39:2: note: suggested alternative: 'qsort'
  sort(p, p + n, cmp);
  ^~~~
  qsort

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