杨领well的专栏

LeetCode: 335. Self Crossing题目描述You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to the south, x...

LeetCode: 334. Increasing Triplet Subsequence题目描述Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array.Formally the function should:Return true if...

LeetCode: 332. Reconstruct Itinerary题目描述Given a list of airline tickets represented by pairs of departure and arrival airports [from, to], reconstruct the itinerary in order. All of the tickets belo...

LeetCode: 331. Verify Preorder Serialization of a Binary Tree题目描述One way to serialize a binary tree is to use pre-order traversal. When we encounter a non-null node, we record the node’s value. If i...

LeetCode: 330. Patching Array题目描述Given a sorted positive integer array nums and an integer n, add/patch elements to the array such that any number in range [1, n] inclusive can be formed by the sum ...

LeetCode: 329. Longest Increasing Path in a Matrix题目描述Given an integer matrix, find the length of the longest increasing path.From each cell, you can either move to four directions: left, right, up...

LeetCode: 328. Odd Even Linked List题目描述Given a singly linked list, group all odd nodes together followed by the even nodes. Please note here we are talking about the node number and not the value in...

LeetCode: 327. Count of Range SumGiven an integer array nums, return the number of range sums that lie in [lower, upper] inclusive.Range sum S(i, j) is defined as the sum of the elements in nums bet...

LeetCode：324. Wiggle Sort II题目描述Given an unsorted array nums, reorder it such that nums[0] < nums[1] > nums[2] < nums[3]…Example 1:Input: nums = [1, 5, 1, 1, 6, 4]Output: One possible an...

LeetCode: 322. Coin Change题目描述You are given coins of different denominations and a total amount of money amount. Write a function to compute the fewest number of coins that you need to make up that ...

LeetCode: 321. Create Maximum Number题目描述Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of length k <= m + n from digits of the two. The rel...

[LeetCode: 319. Bulb Switcher](LeetCode: 319. Bulb Switcher)题目描述There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, y...

LeetCode: 318. Maximum Product of Word Lengths题目描述Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may ass...

LeetCode: 316. Remove Duplicate Letters题目描述Given a string which contains only lowercase letters, remove duplicate letters so that every letter appears once and only once. You must make sure your res...

LeetCode: 315. Count of Smaller Numbers After Self题目描述You are given an integer array nums and you have to return a new counts array. The counts array has the property where counts[i] is the number o...

LeetCode: 313. Super Ugly NumberWrite a program to find the nth super ugly number.Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes of size k.Exampl...

LeetCode: 312. Burst Balloons题目描述Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by array nums. You are asked to burst all the balloons. If the you b...

LeetCode: 310. Minimum Height Trees题目描述For an undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a rooted tree. Among all possible rooted trees,...

LeetCode： 309. Best Time to Buy and Sell Stock with Cooldown题目描述Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit...

LeetCode: 307. Range Sum Query - Mutable题目描述Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.The update(i, val) function modifies nums by updatin...

LeetCode: 306. Additive Number题目描述Additive number is a string whose digits can form additive sequence.A valid additive sequence should contain at least three numbers. Except for the first two numbe...

LeetCode: 304. Range Sum Query 2D - Immutable题目描述Given a 2D matrix matrix, find the sum of the elements inside the rectangle defined by its upper left corner (row1, col1) and lower right corner (row...

LeetCode: 303. Range Sum Query - Immutable题目描述Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.Example:Given nums = [-2, 0, 3, -5, 2, -1]sumRa...

LeetCode: 301. Remove Invalid Parentheses题目描述Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.**Note: **The input string may con...

LeetCode: 300. Longest Increasing Subsequence题目描述Given an unsorted array of integers, find the length of longest increasing subsequence.Example:Input: [10,9,2,5,3,7,101,18]Output: 4 Explanation:...

LeetCode: 299. Bulls and Cows题目描述You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is. Each time your friend ma...

LeetCode: 297. Serialize and Deserialize Binary Tree题目描述ShareSerialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memo...

LeetCode: 290. Word Pattern题目描述Given a pattern and a string str, find if str follows the same pattern.Here follow means a full match, such that there is a bijection between a letter in pattern and ...

LeetCode: 289. Game of Life题目描述According to the Wikipedia’s article: “The Game of Life, also known simply as Life, is a cellular automaton devised by the British mathematician John Horton Conway in ...

LeetCode: 287. Find the Duplicate Number题目描述Given an array nums containing n + 1 integers where each integer is between 1 and n (inclusive), prove that at least one duplicate number must exist. Assu...

LeetCode：295. Find Median from Data Stream题目描述Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two m...

LeetCode: 37. Sudoku Solver

LeetCode: 41. First Missing Positive

LeetCode: 11. Container With Most Water

LeetCode: 42. Trapping Rain Water

LeetCode: 43. Multiply Strings

LeetCode: 45. Jump Game II

LeetCode: 33. Search in Rotated Sorted Array

44. Wildcard Matching

LeetCode: 46. Permutations