#include <stack>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
  stack<int> s1;
  for (int i = 1; i <= 99; i += 2)
    s1.push(i);
  stack<int> s2;
  for (int i = 2; i <= 100; i += 2)
    s2.push(i);
  vector<int> v;
  generate_n(back_inserter(v), 50, [&](){ int i = s1.top(); s1.pop(); return i; });
  generate_n(back_inserter(v), 50, [&](){ int i = s2.top(); s2.pop(); return i; });
}