set OPERATION intersection for boost::unordered_set static boost::unordered_setset OPERATION union for boost::unordered_set static boost::unordered_set<Type>
#include <iostream>#include <unordered_set>
T cmerge (T a, T b){ T t(a); t.insert(b.begin(),b.end()); return t; }
{
std::unordered_set<std::string> first; //