happyxuma1991-优快云博客

原创 99. Recover Binary Search Tree

Two elements of a binary search tree (BST) are swapped by mistake.Recover the tree without changing its structure.Note:A solution using O(n) space is pretty straight forward. Could you dev

2016-08-11 14:28:06 371

原创 97. Interleaving String

Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2.For example,Given:s1 = "aabcc",s2 = "dbbca",When s3 = "aadbbcbcac", return true.When s3 = "aadbbbaccc", r

2016-08-11 14:26:50 408

原创 leetcode.375. Guess Number Higher or Lower II

We are playing the Guess Game. The game is as follows:I pick a number from 1 to n. You have to guess which number I picked.Every time you guess wrong, I'll tell you whether the number I pi

2016-07-21 15:53:01 534

原创 leetcode.374. Guess Number Higher or Lower

We are playing the Guess Game. The game is as follows:I pick a number from 1 to n. You have to guess which number I picked.Every time you guess wrong, I'll tell you whether the number is h

2016-07-21 15:09:21 282

原创 leetcode.184. Department Highest Salary

The Employee table holds all employees. Every employee has an Id, a salary, and there is also a column for the department Id.+----+-------+--------+--------------+| Id | Name | Salary | Departme

2016-07-11 21:21:50 1047

原创 leetcode.177. Nth Highest Salary

Write a SQL query to get the nth highest salary from the Employee table.+----+--------+| Id | Salary |+----+--------+| 1 | 100 || 2 | 200 || 3 | 300 |+----+--------+For exampl

2016-07-11 14:21:57 469

原创 leetcode.197. Rising Temperature

Given a Weather table, write a SQL query to find all dates' Ids with higher temperature compared to its previous (yesterday's) dates.+---------+------------+------------------+| Id(INT) | Date(DA

2016-07-11 12:18:16 351

原创 leetcode.196. Delete Duplicate Emails

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.+----+------------------+| Id | Email |+----+-----

2016-07-11 12:05:32 299

原创 leetcode.183. Customers Who Never Order

Suppose that a website contains two tables, the Customers table and the Orders table. Write a SQL query to find all customers who never order anything.Table: Customers.+----+-------+| Id | Na

2016-07-11 11:44:40 269

原创 leetcode.182. Duplicate Emails

Write a SQL query to find all duplicate emails in a table named Person.+----+---------+| Id | Email |+----+---------+| 1 | a@b.com || 2 | c@d.com || 3 | a@b.com |+----+---------+For

2016-07-11 11:22:41 339

原创 leetcode.181. Employees Earning More Than Their Managers

The Employee table holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.+----+-------+--------+-----------+| Id | Name | Salary |

2016-07-11 11:11:32 270

原创 leetcode.176. Second Highest Salary

Write a SQL query to get the second highest salary from the Employee table.+----+--------+| Id | Salary |+----+--------+| 1 | 100 || 2 | 200 || 3 | 300 |+----+--------+For exa

2016-07-11 10:37:17 278

原创 leetcode.175. Combine Two Tables

Table: Person+-------------+---------+| Column Name | Type |+-------------+---------+| PersonId | int || FirstName | varchar || LastName | varchar |+-------------+---------+Per

2016-07-11 09:52:34 295

原创 leetcode.363. Max Sum of Rectangle No Larger Than K

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k.Example:Given matrix = [ [1, 0, 1], [0, -2, 3]]k

2016-07-10 23:13:12 419

原创 leetcode.368. Largest Divisible Subset

Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of elements in this subset satisfies: Si % Sj = 0 or Sj% Si = 0.If there are multiple solutions

2016-07-10 16:59:07 222

原创 leetcode.373. Find K Pairs with Smallest Sums

You are given two integer arrays nums1 and nums2 sorted in ascending order and an integer k.Define a pair (u,v) which consists of one element from the first array and one element from the second a

2016-07-09 22:27:29 307

原创 leetcode.372. Super Pow

Your task is to calculate ab mod 1337 where a is a positive integer and b is an extremely large positive integer given in the form of an array.Example1:a = 2b = [3]Result: 8Example

2016-07-09 18:03:29 1282

原创 leetcode.367. Valid Perfect Square

Given a positive integer num, write a function which returns True if num is a perfect square else False.Note: Do not use any built-in library function such as sqrt.Example 1:Input: 16Return

2016-07-06 17:50:12 216

原创 leetcode.371. Sum of Two Integers

Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -.Example:Given a = 1 and b = 2, return 3.class Solution {public: int getSum(int a, int b)

2016-07-06 17:36:54 234

原创 leetcode.354. Russian Doll Envelopes

You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope can fit into another if and only if both the width and height of one envelope is greater than

2016-06-25 20:25:23 215

原创 leetcode.355. Design Twitter

Design a simplified version of Twitter where users can post tweets, follow/unfollow another user and is able to see the 10 most recent tweets in the user's news feed. Your design should support the fo

2016-06-24 19:00:02 322

原创 leetcode.365. Water and Jug Problem

You are given two jugs with capacities x and y litres. There is an infinite amount of water supply available. You need to determine whether it is possible to measure exactly zlitres using these two

2016-06-24 16:30:51 538

原创 leetcode.357. Count Numbers with Unique Digits

Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x n.Example:Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x [11,22,33,44,

2016-06-23 22:42:45 190

原创 leetcode.44. Wildcard Matching

Implement wildcard pattern matching with support for '?' and '*'.'?' Matches any single character.'*' Matches any sequence of characters (including the empty sequence).The matching should cover

2016-06-03 22:46:48 225

原创 leetcode.352. Data Stream as Disjoint Intervals

Given a data stream input of non-negative integers a1, a2, ..., an, ..., summarize the numbers seen so far as a list of disjoint intervals.For example, suppose the integers from the data stream ar

2016-06-03 21:41:49 805

原创求一个字符串中连续出现次数最多的子串

#include #include using namespace std;void main(){ string str = "abcabcabcccccdefefefefefef"; int len = str.length(); int maxCount = 0; string longest = ""; for(int pos1 = 0;

2016-06-02 14:51:46 196

原创 leetcode.312. Burst Balloons

Given n balloons, indexed from 0 to n-1. Each balloon is painted with a number on it represented by arraynums. You are asked to burst all the balloons. If the you burst ballooni you will get nums[

2016-05-26 23:10:33 305

原创 leetcode.301. Remove Invalid Parentheses

Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.Note: The input string may contain letters other than the parentheses ( and).

2016-05-26 22:41:33 1085

原创 leetcode.91. Decode Ways

A message containing letters from A-Z is being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded message containing digits, determine the total number

2016-05-26 21:53:02 198

原创 leetcode.273. Integer to English Words

Convert a non-negative integer to its english words representation. Given input is guaranteed to be less than 231 - 1.For example,123 -> "One Hundred Twenty Three"12345 -> "Twelve Thousand Thre

2016-05-26 21:00:02 211

原创 leetcode.45. Jump Game II

Given an array of non-negative integers, you are initially positioned at the first index of the array.Each element in the array represents your maximum jump length at that position.Your goal is

2016-05-26 17:32:15 202

原创 leetcode.37. Sudoku Solver

Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may assume that there will be only one unique solution. A sudoku puzzle

2016-05-26 16:46:21 166

原创 leetcode.164. Maximum Gap

Given an unsorted array, find the maximum difference between the successive elements in its sorted form.Try to solve it in linear time/space.Return 0 if the array contains less than 2 elements.Y

2016-05-26 15:02:25 249

原创 leetcode.336. Palindrome Pairs

Given a list of unique words. Find all pairs of distinct indices(i, j) in the given list, so that the concatenation of the two words, i.e.words[i] + words[j] is a palindrome.Example 1:Given wo

2016-05-26 14:22:16 274

原创 leetcode.56. Merge Intervals

Given a collection of intervals, merge all overlapping intervals.For example,Given [1,3],[2,6],[8,10],[15,18],return [1,6],[8,10],[15,18]. /** * Definition for an interval. * struct Inte

2016-05-25 17:49:23 217

原创 leetcode.32. Longest Valid Parentheses

Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the longest valid parentheses substring is "()", whic

2016-05-25 17:15:58 229

原创 leetcode.138. Copy List with Random Pointer

A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Return a deep copy of the list. class Solution {public:

2016-05-25 16:52:30 254

原创 leetcode.87. Scramble String

Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.Below is one possible representation of s1 = "great": great / \ gr

2016-05-25 14:49:08 207

原创 leetcode.321. Create Maximum Number

Given two arrays of length m and n with digits 0-9 representing two numbers. Create the maximum number of lengthk from digits of the two. The relative order of the digits from the same array must b

2016-05-25 12:48:01 264

原创 leetcode.295. Find Median from Data Stream

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 middle value.Examples: [2,3,4] , the median i

2016-05-24 22:38:29 222

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Qt Creator快速入门源码