任務是列印給定二元樹的左節點。首先,使用者將插入數據,從而生成二元樹,然後列印所形成的樹的左側視圖。
每個節點最多可以有2 個子節點,因此這裡程式必須只遍歷與節點關聯的左指標
如果左指標不為空,則表示它將有一些與之關聯的資料或指針,否則它將是要列印並顯示為輸出的左子級。
Input : 1 0 3 2 4 Output : 1 0 2
這裡,橘色節點代表二元樹的左邊視圖。
在給定的圖中,資料為1 的節點是根節點,因此它將被列印,而不是轉到左子節點,它將列印0,然後它將轉到3 並列印其左子節點,即2。
我們可以使用遞歸方法來儲存節點的層級並重複轉移到
下面的程式碼顯示了給定演算法的C 實作
START Step 1 -> create node variable of type structure Declare int data Declare pointer of type node using *left, *right Step 2 -> create function for inserting node with parameter as new_data Declare temp variable of node using malloc Set temp->data = new_data Set temp->left = temp->right = NULL return temp Step 3 -> declare function void left_view(struct node* root, int level, int* highest_level) IF root = NULL Exit End IF *highest_level < level Print root->data Set *highest_level = level End Recursively call left_view(root->left, level + 1, highest_level) Recursively call left_view(root->right, level + 1, highest_level) Step 4 -> Declare Function void left(struct node* root) Set int highest_level = 0 Call left_view(root, 1, &highest_level) Step 5-> In main() Call New passing value user want to insert as struct node* root = New(1) Call left(root) STOP
#include <stdio.h> #include <stdlib.h> //create a structure of a node struct node { int data; struct node *left, *right; //this pointer will point to the nodes attached with a node }; struct node* New(int new_data) { struct node* temp = (struct node*)malloc(sizeof(struct node)); //allocating memory to a pointer dynamically temp->data = new_data; temp->left = temp->right = NULL; return temp; } void left_view(struct node* root, int level, int* highest_level) { if (root == NULL) //if there is no node that means no data return; // this function will retrun the root node if there is only root node in a tree if (*highest_level < level) { printf("%d\t", root->data); *highest_level = level; } // Recursive function left_view(root->left, level + 1, highest_level); left_view(root->right, level + 1, highest_level); } void left(struct node* root) { int highest_level = 0; left_view(root, 1, &highest_level); } int main() { printf("left view of a binary tree is : "); struct node* root = New(1); root->left = New(0); root->right = New(3); root->right->left = New(2); root->right->right = New(4); left(root); return 0; }
如果我們執行上面的程序,它將產生以下輸出。
left view of a binary tree is : 1 0 2
以上是在C語言中列印二元樹的左視圖的詳細內容。更多資訊請關注PHP中文網其他相關文章!