原创 198. House Robber
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed,
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原创 217, 219,220. Contains Duplicate I, II, III
Given an array of integers, find if the array contains any duplicates. Your function should return true if any value a
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原创 200. Number of Islands
Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water an
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原创 201. Bitwise AND of Numbers Range
Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive.
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原创 207,210. Course Schedule I, II
Course Schedule I There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have p
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原创 283. Move Zeroes
Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the no
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原创 206. Reverse Linked List
Reverse a singly linked list. /** * Definition for singly-linked list. * public class ListNode { * int val; *
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原创 204. Count Primes
Description: Count the number of prime numbers less than a non-negative number, n. 思路： 從前向後掃描，第一次遇到沒標記的應該是沒有因子的質數。然後
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原创 205. Isomorphic Strings
Given two strings s and t, determine if they are isomorphic. Two strings are isomorphic if the characters in s can be
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原创 191. Number of 1 Bits
Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming
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原创 190. Reverse Bits
Reverse bits of a given 32 bits unsigned integer. For example, given input 43261596 (represented in binary as 0000001
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原创 121.122.123.188. Best Time to Buy and Sell Stock I II III IV
Say you have an array for which the ith element is the price of a given stock on day i. If you were only permitted
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原创 202. Happy Number
Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process:
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原创 187. Repeated DNA Sequences
All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying
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原创 203. Remove Linked List Elements
Remove all elements from a linked list of integers that have value val. ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5
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