随笔分类 - leetcode
摘要：Guess Number Higher or Lower We are playing the Guess Game. The game is as follows: I pick a number from 1 to n. You have to guess which number I pick
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摘要：Convert a Number to Hexadecimal Given an integer num, return a string representing its hexadecimal representation. For negative integers, two’s comple
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摘要：Find Mode in Binary Search Tree Given the root of a binary search tree (BST) with duplicates, return all the mode(s) (i.e., the most frequently occurr
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摘要：Minimum Absolute Difference in BST Given the root of a Binary Search Tree (BST), return the minimum absolute difference between the values of any two
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摘要：Diameter of Binary Tree Given the root of a binary tree, return the length of the diameter of the tree. The diameter of a binary tree is the length of
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摘要：Maximum Depth of N-ary Tree Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root
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摘要：Subtree of Another Tree Given the roots of two binary trees root and subRoot, return true if there is a subtree of root with the same structure and no
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摘要：Range Sum Query - Immutable Given an integer array nums, handle multiple queries of the following type: Calculate the sum of the elements of nums betw
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摘要：Power of Three Given an integer n, return true if it is a power of three. Otherwise, return false. An integer n is a power of three, if there exists a
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摘要：Power of Four Given an integer n, return true if it is a power of four. Otherwise, return false. An integer n is a power of four, if there exists an i
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摘要：Middle of the Linked List Given the head of a singly linked list, return the middle node of the linked list. If there are two middle nodes, return the
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摘要：Uncommon Words from Two Sentences A sentence is a string of single-space separated words where each word consists only of lowercase letters. A word is
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摘要：DI String Match A permutation perm of n + 1 integers of all the integers in the range [0, n] can be represented as a string s of length n where: s[i]
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摘要：Find Common Characters Given a string array words, return an array of all characters that show up in all strings within the words (including duplicate
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摘要：Set Mismatch You have a set of integers s, which originally contains all the numbers from 1 to n. Unfortunately, due to some error, one of the numbers
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摘要：Valid Mountain Array Given an array of integers arr, return true if and only if it is a valid mountain array. Recall that arr is a mountain array if a
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摘要：Degree of an Array Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of i
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摘要：Distribute Candies Alice has n candies, where the ith candy is of type candyType[i]. Alice noticed that she started to gain weight, so she visited a d
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摘要：Longest Harmonious Subsequence We define a harmonious array as an array where the difference between its maximum value and its minimum value is exactl
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摘要：Range Addition II You are given an m x n matrix M initialized with all 0's and an array of operations ops, where ops[i] = [ai, bi] means M[x][y] shoul
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