https://leetcode.com/problems/count-complete-tree-nodes/

寬度優先搜索方法，超時！！

/*** Definition for a binary tree node.* struct TreeNode {* int val;* TreeNode *left;* TreeNode *right;* TreeNode(int x) : val(x), left(NULL), right(NULL) {}* };*/ class Solution { public:int countNodes(TreeNode* root) {int height=1;if(root==NULL)return 0;TreeNode * temp=root;stack<TreeNode *> s1;while(temp!=NULL){height++;s1.push(temp);temp=temp->right;}int count=(int)(pow(2,height)-1);bool flag=0;int len=1;int leftVal=0;int rightVal=0;while(!s1.empty()){len++;TreeNode * temp=s1.top();s1.pop();if(right==0)rightVal=getCount(temp->right);elserightVal=leftVal+right+1;leftVal=getCount(temp->left);if(leftVal!=rightVal)break;}int lack=(int)(pow(2,len)-1-(leftVal+rightVal+1));int res=count-lack;return res;}int getCount(TreeNode * node){if(node==NULL)return 0;int res=0;queue<TreeNode *> q;q.push(node);while(!q.empty()){res++;TreeNode * temp=q.front();q.pop();if(temp->left!=NULL)q.push(temp->left);if(temp->right!=NULL)q.push(temp->right);}return res;} };

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轉載于:https://www.cnblogs.com/aguai1992/p/4780452.html

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