python/TangDou/LuoGuBook/LX_16_1.cpp

#include <bits/stdc++.h>

using namespace std;
const int N = 1e6 + 10;

//树的结构体+存储数组
//此处：为二叉树的标准创建、遍历模板，可用于其它试题！
struct Node {
    int id;     // 当前结点ID
    int left;   // 左结点ID
    int right;  // 右结点ID
    char value; //当前结点的value值
} t[N];

//前序遍历
void pre_order(Node node) {
    //利用递归前序输出二叉树
    if (node.id) {
        cout << node.value << " ";
        pre_order(t[node.left]);
        pre_order(t[node.right]);
    }
}

//中序遍历
void in_order(Node node) {
    //利用递归前序输出二叉树
    if (node.id) {
        in_order(t[node.left]);
        cout << node.value << " ";
        in_order(t[node.right]);
    }
}


//后序遍历
void post_order(Node node) {
    //利用递归前序输出二叉树
    if (node.id) {
        post_order(t[node.left]);
        post_order(t[node.right]);
        cout << node.value << " ";
    }
}

//层序遍历
void level_order(Node node) {
    queue<Node> q;
    //放入第一个
    q.push(node);
    while (!q.empty()) {
        Node n1 = q.front();
        q.pop();
        cout << n1.value << " ";
        if (n1.left > 0) q.push(t[n1.left]);
        if (n1.right > 0) q.push(t[n1.right]);
    }
}

int n, m;

/**
  测试数据：
  1 7
  1 2 3
  2 4 5
  3 0 7
  4 0 0
  5 6 0
  6 0 0
  7 0 0
 */
int main() {
    cin >> n >> m;
    //n组数据
    for (int i = 1; i <= n; i++) {
        //清空结构体数组,这个玩意好暴力啊
        memset(&t, 0, sizeof(t));

        //创建树
        for (int j = 1; j <= m; j++) {
            cin >> t[j].value >> t[j].left >> t[j].right;
            t[j].id = j;
        }
        cout << endl;
        cout << "树" << i << ":" << endl;
        //前序
        cout << "前序：";
        pre_order(t[1]);
        cout << endl;
        //中序
        cout << "中序：";
        in_order(t[1]);
        cout << endl;
        //后序
        cout << "后序：";
        post_order(t[1]);
        cout << endl;
        //层序
        cout << "层序：";
        level_order(t[1]);
        cout << endl;
        cout << "====================================================" << endl;
        cout << endl;
    }
    return 0;
}
//深度就是树的层数，本题为4