Method insert

BinaryHeap.py:17–20

(self, k)

    # 插入节点
    def insert(self, k):
        self.heapList.append(k)
        self.currentSize += 1
        self.percUp(self.currentSize)

    # 删除堆顶元素后, 交换堆尾和空堆顶的位置并实现元素的下沉
    def percDown(self, i):