563. Binary Tree Tilt-二叉树的坡度
Given the root of a binary tree, return the sum of ever... » 阅读全文
561. Array Partition I-数组拆分 I
Given an integer array nums of 2n integers, group these... » 阅读全文
559. Maximum Depth of N-ary Tree-N 叉树的最大深度
Given a n-ary tree, find its maximum depth. The maximum... » 阅读全文
557. Reverse Words in a String III-反转字符串中的单词 III
Given a string, you need to reverse the order of charac... » 阅读全文
551. Student Attendance Record I-学生出勤记录 I
You are given a string representing an attendance recor... » 阅读全文
543. Diameter of Binary Tree-二叉树的直径
Given a binary tree, you need to compute the length of ... » 阅读全文
541. Reverse String II-反转字符串 II
Given a string and an integer k, you need to reverse th... » 阅读全文
530. Minimum Absolute Difference in BST-二叉搜索树的最小绝对差
Given a binary search tree with non-negative values, fi... » 阅读全文
521. Longest Uncommon Subsequence I-最长特殊序列 Ⅰ
给你两个字符串a和b，请返回这两个字符串中最长的特殊序列的长度。如果不存在，则返回-1。 「最长特殊序列」定义... » 阅读全文
520. Detect Capital-检测大写字母
Given a word, you need to judge whether the usage of ca... » 阅读全文