定義 正則表達(dá)式(Regular Expression) 用某種模式去匹配一類字符串的公式，主要用來描述字符串匹配的工具。 匹配 文本或字符存在不止一個(gè)部分滿足給定的正則...
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80.Remove Duplicates from Sorted Array II(Medium)
Follow up for "Remove Duplicates":What if duplicates are allowed at most twice?給定一個(gè)有序的整...
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500.Keyboard Row(Easy)
Given a List of words, return the words that can be typed using letters of alphabet on ...
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374.Guess Number Higher or Lower(Easy)
We are playing the Guess Game. The game is as follows:I pick a number from 1 to n. You ...
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大數(shù)運(yùn)算（整數(shù)）簡介 我們都知道，計(jì)算機(jī)中的數(shù)據(jù)類型是有界限的，大部分的編程語言都僅支持int(-223~232-1)類型和long(-264~264)類型，少數(shù)語言會(huì)支持long long...
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121. Best Time to Buy and Sell Stock(Easy)
Say you have an array for which the i th element is the price of a given stock on day i...
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283.Move Zeroes(Easy)
Given an array nums, write a function to move all 0's to the end of it while maintainin...
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226.Invert Binary Tree(Easy)
Invert a binary tree.反轉(zhuǎn)二叉樹 基本上二叉樹的玩意兒用遞歸都能做 For example to My Solution (Java) Version 1...
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9.Palindrome Number(Easy)
Determine whether an integer is a palindrome. Do this without extra space.判斷一個(gè)數(shù)是否為回文數(shù)，不...
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264.Ugly Number II(Medium)Write a program to find the n-th ugly number. Ugly numbers are positive numbers whose p...
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263.Ugly Number(Easy)
Write a program to check whether a given number is an ugly number. Ugly numbers are pos...
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217.Contains Duplicate(Easy)
Given an array of integers, find if the array contains any duplicates. Your function sh...
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28.Implement strStr()(Easy)
Implement strStr().Returns the index of the first occurrence of needle in haystack, or ...
