#include <boost/container/flat_set.hpp>

int main() {
    boost::container::flat_set<size_t> s1;
    boost::container::flat_set<size_t> s2;

    auto a1 = { 0x9a29ad0,0x9a2bee0,0x9a2dc20,0x9a2f960,0x9db1770,0x9db8740,
        0x9db88c0,0x9db8990,0x9db8a60,0x9db9340,0x9db9e90,0x9dbaa80,0x9dbb580};
    auto a2 = { 0x9db1770,0x9db8740,0x9db88c0,0x9db8990,0x9db8a60,0x9db9340,
        0x9db9460,0x9db9530,0x9db9600,0x9db9e90,0x9dba030,0x9dba100,0x9dba1d0,
        0x9dbaa80,0x9dbaba0,0x9dbac70,0x9dbad40,0x9dbb580,0x9dbb6a0,0x9dbb770,
        0x9dbb840,0x9dbc0e0};

    for (auto a : a1) {
        s1.insert(a);
    }
    for (auto a : a2) {
        s2.insert(a);
    }
    s1.insert(s2.begin(), s2.end());
}