随笔分类 - LeetCode
摘要：Spiral Matrix II (M) 题目 Given a positive integer n, generate a square matrix filled with elements from 1 to \(n^2\) in spiral order. Example: Input: 3
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摘要：Length of Last Word (E) 题目 Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in t
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摘要：Hamming Distance (E) 题目 The Hamming distance between two integers is the number of positions at which the corresponding bits are different. Given two
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摘要：Valid Perfect Square (E) 题目 Given a positive integer num, write a function which returns True if num is a perfect square else False. Follow up: Do not
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摘要：Insert Interval (H) 题目 Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assume that th
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摘要：Ugly Number II (M) 题目 Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. Exampl
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摘要：Merge Intervals (M) 题目 Given a collection of intervals, merge all overlapping intervals. Example 1: Input: [[1,3],[2,6],[8,10],[15,18]] Output: [[1,6]
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摘要：Jump Game (M) 题目 Given an array of non-negative integers, you are initially positioned at the first index of the array. Each element in the array repr
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摘要：Prison Cells After N Days (M) 题目 There are 8 prison cells in a row, and each cell is either occupied or vacant. Each day, whether the cell is occupied
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摘要：Spiral Matrix (M) 题目 Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order. Example 1: Input: [ [ 1,
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摘要：Maximum Subarray (E) 题目 Given an integer array nums, find the contiguous subarray (containing at least one number) which has the largest sum and retur
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摘要：Binary Tree Level Order Traversal II (E) 题目 Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to ri
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摘要：N-Queens II (H) 题目 The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an int
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摘要：N-Queens (H) 题目 The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other. Given an intege
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摘要：Arranging Coins (E) 题目 You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins. Given n
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摘要：Odd Even Linked List (M) 题目 Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about
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摘要：Counting Bits (M) 题目 Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1's in their binary
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摘要：Top K Frequent Elements (M) 题目 Given a non-empty array of integers, return the *k* most frequent elements. Example 1: Input: nums = [1,1,1,2,2,3], k =
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摘要：Pow(x, n) (M) 题目 mplement pow(x, n), which calculates x raised to the power n (\(x^n\)). Example 1: Input: 2.00000, 10 Output: 1024.00000 Example 2: I
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摘要：Group Anagrams (M) 题目 Given an array of strings, group anagrams together. Example: Input: ["eat", "tea", "tan", "ate", "nat", "bat"], Output: [ ["ate"
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