0001 template <typename T> T LeftHeap<T>::delMax() { //O(logn)
0002    BNP<T> lHeap = _root->lc; if (lHeap) lHeap->parent = nullptr; //左子堆
0003    BNP<T> rHeap = _root->rc; if (rHeap) rHeap->parent = nullptr; //右子堆
0004    T e = _root->data; delete _root;  _size--; //删除根节点
0005    _root = meld(lHeap, rHeap); //融合左、右子堆
0006    return e; //返回原根节点的数据项
0007 } //delMax