04-树6 Complete Binary Search Tree（C++）

思路

先排序（冒泡排序）

用数组建一棵空树（用数组，填好左右儿子）

中序遍历填数（ Tree::travIn() ）

顺序输出即为层次遍历（ Tree::travLevel() ）

code

# include <iostream>
# include <cstdio>
# include <cstring>

int A[1010];

struct Node {
	int data, left, right;
};

struct Tree {
	int n;
	Node * treeList;
	int root;

	Tree(int _n) :n(_n), root(1)
	{
		treeList = new Node[1010];
		for (int i = 1; i <= n; ++i)
		{
			treeList[i].left = (i * 2 <= n) ? i * 2 : -1;
			treeList[i].right = (i * 2 + 1 <= n) ? i * 2 + 1 : -1;
		}
	}

	void travIn(int rt, int & order)
	{
		if (rt == -1) return;
		travIn(treeList[rt].left, order);
		treeList[rt].data = A[order++];
		travIn(treeList[rt].right, order);
	}

	void travLevel(void)
	{
		for (int i = 1; i <= n; ++i)
			printf("%d%s", treeList[i].data, i == n ? "\n" : " ");
	}
	
};

void bubbleSort(int n) //A从0
{
	for (int i = n - 1; i > 0; --i)
		for (int j = 0; j < i; ++j)
			if (A[j] > A[j + 1])
			{
				int t = A[j];
				A[j] = A[j + 1];
				A[j + 1] = t;
			}
}

int main(void)
{
	int n;
	scanf("%d", &n);
	for (int i = 0; i < n; ++i) scanf("%d", &A[i]);

	bubbleSort(n);

	Tree t(n);
	int order = 0;
	t.travIn(t.root, order);
	t.travLevel();
	return 0;
}