2020
02-29
02-29
[LeetCode每日一题]62. Unique Paths
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题目如下：
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).
The robot can only move either down or right .... Read More >
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题目如下：
A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below).
The robot can only move either down or right .... Read More >
题目如下：
Given a string s, find the longest palindromic substring in s. You may assume that the maximum length of s is 1000.
5. Longest Palindromic S.... Read More >
题目如下：
You are given a perfect binary tree where all leaves are on the same level, and every parent has two children. The binary tree has the followi.... Read More >
题目如下：
Given a binary tree, flatten it to a linked list in-place.
For example, given the following tree:
1
/ \
2 5
/ \ \
3 .... Read More >
2020
02-24
02-24
[LeetCode每日一题]113. Path Sum II
题目如下：
Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum.
给定一棵二叉树和一个整数sum，让我们找出所有从根节点到叶子节点权值之和为.... Read More >
题目如下：
Given an array where elements are sorted in ascending order, convert it to a height balanced BST.
For this problem, a height-balanced binary t.... Read More >
题目如下：
Given preorder and inorder traversal of a tree, construct the binary tree.
eg:
preorder = [3,9,20,15,7]
inorder = [9,3,15,20,7]
re.... Read More >
2020
02-21
02-21
[LeetCode每日一题]101. Symmetric Tree
题目如下：
Given a binary tree, check whether it is a mirror of itself (ie, symmetric around its center).
For example, this binary tree [1,2,2,3,4,4,3] i.... Read More >
2020
02-20
02-20
[LeetCode每日一题]100. Same Tree
题目如下：
Given two binary trees, write a function to check if they are the same or not.
Two binary trees are considered the same if they are structurall.... Read More >
题目如下:
Two elements of a binary search tree (BST) are swapped by mistake.
Recover the tree without changing its structure.
LeetCode-99 Recover Binary.... Read More >