下列程序的输出结果是 _____ 。 #include using namespace std; class Test { public: Test() { cnt++; } ~Test() {cnt--; } static int Count() { returncnt;} private: static int cnt; }; int Test::cnt = 0; int main() { cout << Test::Count()<<' '; Test tl, t2; Test* pT3 = new Test; Test* pT4 = new Test; cout << Test::Count()<<' '; delete pT4; delete pT3; cout << Test::Count()<< endl; return 0; }