View Compilation Error

0_0_38788131_28056.cpp: In function 'int main()':
0_0_38788131_28056.cpp:122:26: error: cannot convert 'std::vector<std::pair<int, int> > [1000000]' to 'std::vector<std::pair<int, int> >&'
  122 |       vector<Pii>().swap(son);
      |                          ^~~
      |                          |
      |                          std::vector<std::pair<int, int> > [1000000]
In file included from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/vector:66,
                 from gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/functional:64,
                 from .\stdc++.h:53:
gcc-13.1.0/lib/gcc/x86_64-w64-mingw32/13.1.0/include/c++/bits/stl_vector.h:1581:20: note:   initializing argument 1 of 'constexpr void std::vector<_Tp, _Alloc>::swap(std::vector<_Tp, _Alloc>&) [with _Tp = std::pair<int, int>; _Alloc = std::allocator<std::pair<int, int> >]'
 1581 |       swap(vector& __x) _GLIBCXX_NOEXCEPT
      |            ~~~~~~~~^~~