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# House Robber II

House Robber IINote: This is an extension of House Robber. After robbing those houses on that street, the thief has found himself a new place for his thievery so that he will not get too much attent

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# Add and Search Word - Data structure design

Add and Search Word - Data structure designDesign a data structure that supports the following two operations: 12void addWord(word)bool search(word) search(word) can search a literal word or a regula

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# Course Schedule II

Course Schedule IIThere are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is

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# Minimum Size Subarray Sum

Minimum Size Subarray SumGiven an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarray of which the sum ≥ s. If there isn’t one, return 0 instead. F

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# Implement Trie (Prefix Tree)

Implement Trie (Prefix Tree)Implement a trie with insert, search, and startsWith methods. Note: You may assume that all inputs are consist of lowercase letters a-z. 提示 解題應用 Trie Tree Defaul

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# Course Schedule

Course ScheduleThere are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is ex

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# Bitwise AND of Numbers Range

Bitwise AND of Numbers RangeGiven a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5, 7], you sho

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# Number of Islands

Number of IslandsGiven a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertical

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# Binary Tree Right Side View

Binary Tree Right Side ViewGiven a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. For example:Given the followi

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# Repeated DNA Sequences

Repeated DNA SequencesAll DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: “ACGAATTCCG”. When studying DNA, it is sometimes useful to identify repeated sequences

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# Largest Number

Largest NumberGiven a list of non negative integers, arrange them such that they form the largest number. For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330. Note: The result

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# Two Sum II - Input array is sorted

Two Sum II - Input array is sortedGiven an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The function twoSum should

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# Find Peak Element

Find Peak ElementA peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[i+1], find a peak element and return its index. The array may contain multipl

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# Find Minimum in Rotated Sorted Array

Find Minimum in Rotated Sorted ArraySuppose an array sorted in ascending order is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2). Find the minimum e

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# Maximum Product Subarray

Maximum Product SubarrayFind the contiguous subarray within an array (containing at least one number) which has the largest product. For example:12Given the array [2,3,-2,4],the contiguous subarray [

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# Evaluate Reverse Polish Notation

Evaluate Reverse Polish NotationEvaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each operand may be an integer or another expression. For ex

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# Sort List

Sort ListSort a linked list in O(n log n) time using constant space complexity. 提示 解題應用 LinkedList Pointer Sort MergeSort Default:12345678910/** * Definition for singly-linked list. * typ

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# Insertion Sort List

Insertion Sort ListSort a linked list using insertion sort. 提示 解題應用 LinkedList Pointer Sort Insertion Sort Default:12345678910/** * Definition for singly-linked list. * type ListNode stru

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# Binary Tree Preorder Traversal

Binary Tree Preorder TraversalGiven a binary tree, return the preorder traversal of its nodes’ values. For example:Given binary tree {1,#,2,3}, 123451 \ 2 /3 return [1,2,3]. Note: Recursive solution

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# Reorder List

Reorder ListGiven a singly linked list L: L0→L1→…→Ln-1→Ln,reorder it to: L0→Ln→L1→Ln-1→L2→Ln-2→… You must do this in-place without altering the nodes’ values. For example:1Given {1,2,3,4},

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# Word Break

Word BreakGiven a non-empty string s and a dictionary wordDict containing a list of non-empty words, determine if s can be segmented into a space-separated sequence of one or more dictionary words. Y

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# Single Number II

Single Number IIGiven an array of integers, every element appears three times except for one, which appears exactly once. Find that single one. Note: Your algorithm should have a linear runtime compl