bool isHtmlMatched(const vector<string>& tags) {
LinkedStack<string> S;
typedef vector<string>::const_iterator Iter;
for (Iter p = tags.begin(); p != tags.end(); ++p) {
if (p->at(1) != '/')
S.push(*p);
else {
if (S.empty()) return false;
string open = S.top().substr(1);
string close = p->substr(2);
if (open.compare(close) != 0) return false;
else S.pop();
}
}
if (S.empty()) return true;
else return false;
}
