随笔分类 - LeetCode
摘要：Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the researcher's h-index. According
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摘要：Convert a non-negative integer num to its English words representation. Example 1: Input: num = 123 Output: "One Hundred Twenty Three" Example 2: Inpu
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摘要：Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. For example, Given nums = [0, 1,
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摘要：Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Example: Note: Hint: 这道题是之前那
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摘要：Write a program to check whether a given number is an ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Example
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摘要：Given an integer array nums, in which exactly two elements appear only once and all the other elements appear exactly twice. Find the two elements tha
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摘要：Given a non-negative integer num, repeatedly add all its digits until the result has only one digit. Example: Follow up:Could you do it without any lo
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摘要：Given a binary tree, return all root-to-leaf paths. For example, given the following binary tree: 1 / \ 2 3 \ 5 All root-to-leaf paths are: ["1->2->5"
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摘要：Given two strings s and t, write a function to determine if t is an anagram of s.For example,s = "anagram", t = "nagaram", return true.s = "rat", t = ...
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摘要：Given a string of numbers and operators, return all possible results from computing all the different possible ways to group numbers and operators. Th
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摘要：Write an efficient algorithm that searches for a target value in an m x n integer matrix. The matrix has the following properties: Integers in each ro
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摘要：Given an array nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k num
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摘要：Given an array nums of n integers where n > 1, return an array output such that output[i] is equal to the product of all the elements of numsexcept nu
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摘要：Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 2 -> 3 -
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摘要：Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowes
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摘要：Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST. According to the definition of LCA on Wikipedia
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摘要：Given a singly linked list, determine if it is a palindrome. Example 1: Input: 1->2 Output: false Example 2: Input: 1->2->2->1 Output: true Follow up:
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摘要：Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n. Example 1: Input: n = 13 Output:
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摘要：Implement the following operations of a queue using stacks. push(x) -- Push element x to the back of queue. pop() -- Removes the element from in front
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摘要：Given an integer, write a function to determine if it is a power of two. Example 1: Example 2: Example 3: 这道题让我们判断一个数是否为2的次方数，而且要求时间和空间复杂度都为常数，那么对于这种玩
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