AVLT

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct Node {int key;struct Node *left;struct Node *right;int height;
} Node;int max(int a, int b) {return (a > b) ? a : b;
}int height(Node *N) {if (N == NULL)return 0;return N->height;
}
Node* newNode(int key) {Node* node = (Node*)malloc(sizeof(Node));node->key = key;node->left = NULL;node->right = NULL;node->height = 1;return node;
}Node *rightRotate(Node *y) {Node *x = y->left;Node *T2 = x->right;x->right = y;y->left = T2;y->height = max(height(y->left), height(y->right)) + 1;x->height = max(height(x->left), height(x->right)) + 1;return x;
}Node *leftRotate(Node *x) {Node *y = x->right;Node *T2 = y->left;y->left = x;x->right = T2;x->height = max(height(x->left), height(x->right)) + 1;y->height = max(height(y->left), height(y->right)) + 1;return y;
}int getBalance(Node *N) {if (N == NULL)return 0;return height(N->left) - height(N->right);
}Node* insert(Node* node, int key) {if (node == NULL)return(newNode(key));if (key < node->key)node->left = insert(node->left, key);else if (key > node->key)node->right = insert(node->right, key);else return node;node->height = 1 + max(height(node->left), height(node->right));int balance = getBalance(node);if (balance > 1 && key < node->left->key)return rightRotate(node);if (balance < -1 && key > node->right->key)return leftRotate(node);// Left Right (LR) Caseif (balance > 1 && key > node->left->key) {node->left = leftRotate(node->left);return rightRotate(node);}if (balance < -1 && key < node->right->key) {node->right = rightRotate(node->right);return leftRotate(node);}return node;
}void preOrder(Node *root) {if(root != NULL) {printf("%d,", root->key);preOrder(root->left);preOrder(root->right);}
}int main() {char line[2048];char* token;Node *root = NULL;if (fgets(line, sizeof(line), stdin) == NULL) {return 1;}line[strcspn(line, "\n")] = 0;token = strtok(line, ",");while (token != NULL) {if (strlen(token) > 0) {int key = atoi(token);root = insert(root, key);}token = strtok(NULL, ",");}preOrder(root);printf("\n");return 0;
}