in include/SparseSetAbstractDomain.h [68:78]
bool leq(const SparseSetValue& other) const override {
if (m_element_num > other.m_element_num) {
return false;
}
for (size_t i = 0; i < m_element_num; ++i) {
if (!other.contains(m_dense[i])) {
return false;
}
}
return true;
}