1640. Check Array Formation Through Concatenation-能否连接形成数组
You are given an array of distinct integers arr and an ... » 阅读全文
1217. Minimum Cost to Move Chips to The Same Position-玩筹码
We have n chips, where the position of the ith chip is ... » 阅读全文
1022. Sum of Root To Leaf Binary Numbers
You are given the root of a binary tree where each node... » 阅读全文
985. Sum of Even Numbers After Queries-查询后的偶数和
We have an array A of integers, and an array queries of... » 阅读全文
680. Valid Palindrome II-验证回文字符串 Ⅱ
Given a non-empty string s, you may delete at most one ... » 阅读全文
671. Second Minimum Node In a Binary Tree-二叉树中第二小的节点
Given a non-empty special binary tree consisting of nod... » 阅读全文
643. Maximum Average Subarray I-子数组最大平均数 I
Given an array consisting of n integers, find the conti... » 阅读全文
598. Range Addition II-范围求和 II
You are given an m x n matrix M initialized with all 0&... » 阅读全文
572. Subtree of Another Tree-另一个树的子树
Given two non-empty binary trees s and t, check whether... » 阅读全文
LCP 22. 黑白方格画
小扣注意到秋日市集上有一个创作黑白方格画的摊位。摊主给每个顾客提供一个固定在墙上的白色画板，画板不能转动。画板... » 阅读全文