思路: 给的是BST(无相同节点),那么每个节点肯定大于左子树中的最大,小于右子树种的最小。根据这个特性,找LCA就简单多了。 分三种情况: (1)p和q都在root左边,那么往root左子树递归。 (2)在右同理。 (3)一左一右的,那么root->val肯定大于其中的1个,小于另一个。 AC代码 python3 迭代 AC代码 递归 AC...
BST(6) Stack(5) Math(5) LinkedList(5) Two pointers(4) HashMap(4) Java(3) 更多 随笔分类 Algorithm(3) Brain Teaser(1) C#(1) Data Structure(2) Deep Learning(1) Design Pattern(1) Interview(4) Java(9) Leetcode | Array(18) Leetcode | Bit(1) Leetcode...
在这个示例中,lowestCommonAncestor函数使用递归的方式来查找节点 A 和 B 的 LCA。在main函数中,构造了一个二叉树,并找到了节点 5 和节点 1 的最低公共祖先。 这段代码输出的结果应该是: 代码语言:bash AI代码解释 $ Lowest Common Ancestor of5and1is3 这表明节点 5 和节点 1 的最低公共祖先是节点 3。
[LeetCode]235.Lowest Common Ancestor of a Binary Search Tree 题目Givenabinarysearchtree(BST), findthelowest common ancestor (LCA)oftwogivennodesin... allowanode to beadescendantofitself).”Forexample,thelowest common ancestor (LCA)of PAT(甲级)1051.LCA in a Binary Tree(30) ...
思路:用map保存BST里的结点,遍历一遍数组,找到的在u,v之间的那个点就是lca。(今年再给我来道这样的三十分大题吧) #include<cstdio> #include<vector> #include<map> using namespace std; map<int,bool> mp; int main () { int m,n,u,v,a; scanf ("%d %d",&m,&n); vector<int> pre(n);...
PAT 1051.LCA in a Binary Tree(30) The lowest common ancestor (LCA) of two nodes U and V in a tree is the deepest node that has both U and V as descendants. Given any two nodes in a binary tree, you are supposed to find their LCA. 输入格式: Each input file contains one test ...
For example, the lowest common ancestor (LCA) of nodes2and8is6. Another example is LCA of nodes2and4is2, since a node can be a descendant of itself according to the LCA definition. 解决思路 递归,可以用BST特有的二分递归,也可以普通递归。
t = lcaIter(root, n1, n2); printf("LCA of %d and %d is %d \n", n1, n2, t->data); } ~LCABST() { deleteTree(root); } void deleteTree(Node *r) { if (!r) return; deleteTree(r->left); deleteTree(r->right); delete r; r = NULL; } };...
For example, the lowest common ancestor (LCA) of nodes2and8is6. Another example is LCA of nodes2and4is2, since a node can be a descendant of itself according to the LCA definition. 思路:因为是bst, 如果root,的值介于pq之间,root就是共同祖先。
NextRightPointer.java NextRightPointerII.java PathSumIII.java PostorderToBT.java PreorderToBT.java SortedArrayToBST.java SubtreeOfAnotherTree.java SymmetricTree.java ValidBinarySearchTree.java ZigZagTraversal.java two_pointers README.mdBreadcrumbs leetcode-1 /problems /src /tree / LCA.java Latest...