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全部文章 / LeetCode （共151篇）

LeetCode: 107. Binary Tree Level Order Traversal II

LeetCode: 107. Binary Tree Level Order Traversal II 题目描述 Given a binary tree, return the bottom-up level order traversal of its nodes’ values. (ie, ...

2018-03-25

0 464

LeetCode: 106. Construct Binary Tree from Inorder and Postorder Traver

LeetCode: 106. Construct Binary Tree from Inorder and Postorder Traver 题目描述 Given inorder and postorder traversal of a tree, construct the binary tr...

leetcode

2018-03-24

0 490

LeetCode: 105. Construct Binary Tree from Preorder and Inorder Traversal

LeetCode: 105. Construct Binary Tree from Preorder and Inorder Traversal 题目描述 Given preorder and inorder traversal of a tree, construct the binary t...

leetcode

2018-03-23

0 571

LeetCode: 103. Binary Tree Zigzag Level Order Traversal

LeetCode: 103. Binary Tree Zigzag Level Order Traversal 题目描述 Given a binary tree, return the zigzag level order traversal of its nodes’ values. (ie,...

leetcode

2018-03-23

0 428

LeetCode: 102. Binary Tree Level Order Traversal

LeetCode: 102. Binary Tree Level Order Traversal 题目描述 Given a binary tree, return the level order traversal of its nodes’ values. (ie, from left to ...

leetcode

2018-03-22

0 444

LeetCode: 101. Symmetric Tree

LeetCode: 101. Symmetric Tree 题目描述 Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center). For example, this...

LeetCode

2018-03-21

0 367

LeetCode: 99. Recover Binary Search Tree

LeetCode: 99. Recover Binary Search Tree 题目描述 Two elements of a binary search tree (BST) are swapped by mistake. Recover the tree without changing ...

LeetCode

2018-03-20

0 632

LeetCode: 98. Validate Binary Search Tree

LeetCode: 98. Validate Binary Search Tree 题目描述 Given a binary tree, determine if it is a valid binary search tree (BST). Assume a BST is defined as...

LeetCode

2018-03-19

0 540

LeetCode: 95. Unique Binary Search Trees II

LeetCode: 95. Unique Binary Search Trees II 题目描述 Given an integer n, generate all structurally unique BST’s (binary search trees) that store values ...

leetcode

2018-03-19

0 514

LeetCode: 94. Binary Tree Inorder Traversal

LeetCode: 94. Binary Tree Inorder Traversal 题目描述 Given a binary tree, return the inorder traversal of its nodes’ values. For example: Given binary...

LeetCode

2018-03-18

0 537