1066 Root of AVL Tree
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#include <bits/stdc++.h> # define LL long long using namespace std; class TreeNode{ public: int val; TreeNode* left; TreeNode* right; TreeNode(int v):val{v},left{NULL},right{NULL}{} int getHeight(){ int left=this->left==NULL?0:this->left->getHeight(); int right=this->right==NULL?0:this->right->getHeight(); return 1+max(left,right); } int leftHeight(){ if(this->left==NULL) return 0; return this->left->getHeight(); } int rightHeight(){ if(this->right==NULL) return 0; return this->right->getHeight(); } void add(int n){ if(n<this->val){ if(this->left==NULL){ this->left=new TreeNode(n); }else{ this->left->add(n); } }else{ if(this->right==NULL){ this->right=new TreeNode(n); }else{ this->right->add(n); } } if(this->leftHeight()-this->rightHeight()>1){ if(this->left->rightHeight()>this->left->leftHeight()){ this->left->leftRotate(); } this->rightRotate(); return; } if(this->rightHeight()-this->leftHeight()>1){ if(this->right->leftHeight()>this->right->rightHeight()){ this->right->rightRotate(); } this->leftRotate(); } } void leftRotate(){ TreeNode* newNode=new TreeNode(this->val); newNode->left=this->left; newNode->right=this->right->left; this->val=this->right->val; this->left=newNode; this->right=this->right->right; } void rightRotate(){ TreeNode* newNode=new TreeNode(this->val); newNode->right=this->right; newNode->left=this->left->right; this->val=this->left->val; this->right=newNode; this->left=this->left->left; } }; int main(){ int N; scanf("%d", &N); int r=0; scanf("%d", &r); TreeNode* root=new TreeNode(r); for(int i=1;i<=N-1;i++){ scanf("%d", &r); root->add(r); } cout<<root->val; return 0; }
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PAT 甲级 1066 Root of AVL Tree (25 分)(快速掌握平衡二叉树的旋转,内含代码和注解)***