04-树5 Root of AVL Tree (25 分)
An AVL tree is a self-balancing binary search tree. In an AVL tree, the heights of the two child subtrees of any node differ by at most one; if at any time they differ by more than one, rebalancing is done to restore this property. Figures 1-4 illustrate the rotation rules.
Now given a sequence of insertions, you are supposed to tell the root of the resulting AVL tree.
Input Specification:
Each input file contains one test case. For each case, the first line contains a positive integer N (≤20) which is the total number of keys to be inserted. Then N distinct integer keys are given in the next line. All the numbers in a line are separated by a space.
Output Specification:
For each test case, print the root of the resulting AVL tree in one line.
Sample Input 1:
5
88 70 61 96 120
Sample Output 1:
70
Sample Input 2:
7
88 70 61 96 120 90 65
Sample Output 2:
88
#include<cstdio>
#include<algorithm>
using namespace std;
struct node{
int v,height;
node* lchild,*rchild;
}*root; node* newNode(int v){
node* Node = new node;
Node->v = v;
Node->height = ;
Node->lchild = Node->rchild = NULL;
return Node;
} int getHeight(node* root){
if(root == NULL) return ;
return root->height;
} void updateHeight(node* root){
root->height = max(getHeight(root->lchild),getHeight(root->rchild)) + ;
} int getBalanceFactor(node* root){
return getHeight(root->lchild) - getHeight(root->rchild);
} void R(node* &root){
node* temp = root->lchild;
root->lchild = temp->rchild;
temp->rchild = root;
updateHeight(root);
updateHeight(temp);
root = temp;
} void L(node* &root){
node* temp = root->rchild;
root->rchild = temp->lchild;
temp->lchild = root;
updateHeight(root);
updateHeight(temp);
root = temp;
} void insert(node* &root,int v){
if(root == NULL){
root = newNode(v);
return;
}
if(root->v > v){
insert(root->lchild,v);
updateHeight(root);
if(getBalanceFactor(root) == ){
if(getBalanceFactor(root->lchild) == ){
R(root);
}else if(getBalanceFactor(root->lchild) == -){
L(root->lchild);
R(root);
}
}
}else{
insert(root->rchild,v);
updateHeight(root);
if(getBalanceFactor(root) == -){
if(getBalanceFactor(root->rchild) == -){
L(root);
}else if(getBalanceFactor(root->rchild) == ){
R(root->rchild);
L(root);
}
}
}
} int main(){
int n,v;
scanf("%d",&n);
for(int i = ; i < n; i++){
scanf("%d",&v);
insert(root,v);
}
printf("%d",root->v);
return ;
}
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