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原创 LeetCode 95: Unique Binary Search Trees II

Difficulty: 4Frequency: 1Problem:Given n, generate all structurally unique BST's (binary search trees) that store values 1...n.For example,Given n = 3, your program should return all 5

2013-09-11 22:05:04 355

原创 LeetCode 99: Recover Binary Search Tree

Difficulty: 4Frequency: 2Problem: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) sp

2013-09-08 21:13:55 481

原创 LeetCode 103: Binary Tree Zigzag Level Order Traversal

Difficulty: 4Frequency: 3Problem:Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and a

2013-09-08 20:15:31 414

原创 LeetCode 123: Best Time to Buy and Sell Stock III

Difficulty: 4Frequency: 2Problem: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. You may comp

2013-09-08 19:06:56 451

原创 LeetCode 124: Binary Tree Maximum Path Sum

Difficulty: 4Frequency: 2Problem:Given a binary tree, find the maximum path sum.The path may start and end at any node in the tree.For example:Given the below binary tree,

2013-09-08 17:16:03 440

原创 LeetCode 128: Longest Consecutive Sequence

Difficulty: 4Frequency: 3Problem:Given an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given [100, 4, 200, 1, 3, 2],The

2013-09-07 21:13:17 315

原创 LeetCode 4: Median Of Two Sorted Array

Difficulty: 5Frequency: 3Problem:There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log

2013-09-06 14:08:28 326

原创 LeetCode 50: Pow(x, n)

Difficulty: 3Frequency: 5Problem:Implement pow(x, n).Solution:1. Recursive solution from AnnieKim. Lots of subtleties.class Solution {public: double pow(double x, int n) {

2013-09-05 20:21:40 813

原创 LeetCode 49: Anagrams

Difficulty: 3Frequency: 4Problem:Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.Solution:class Solution {public

2013-09-05 19:13:23 446

原创 LeetCode 46: Permutations

Difficulty: 3Frequency: 4Problem:Given a collection of numbers, return all possible permutations.For example,[1,2,3] have the following permutations:[1,2,3], [1,3,2], [2,1,3],

2013-09-05 18:45:10 443

原创 LeetCode 60: Permutation Sequence

Difficulty: 5Frequency: 1Problem:The set [1,2,3,…,n] contains a total of n! unique permutations.By listing and labeling all of the permutations in order,We get the following sequ

2013-09-05 15:21:28 538

原创 LeetCode 31: Next Permutation

Difficulty: 5Frequency: 2Problem:Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers.If such arrangement is not possib

2013-09-05 14:26:18 498

原创 LeetCode 92: Reverse Linked List II

Difficulty: 3Frequency: 2Problem:Reverse a linked list from position m to n. Do it in-place and in one-pass.For example:Given 1->2->3->4->5->NULL, m = 2 and n = 4,return 1-

2013-09-05 09:02:19 350

原创 LeetCode 91: Decode Ways

Difficulty: 3Frequency: 4Problem:A message containing letters from A-Z is being encoded to numbers using the following mapping:'A' -> 1'B' -> 2...'Z' -> 26Given an encoded me

2013-09-04 18:58:18 357

原创 LeetCode 86: Partition List

Difficulty: 3Frequency: 3Problem:Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal tox.You should preserve the

2013-09-04 16:56:05 473

原创 LeetCode 82: Remove Duplicates from Sorted List II

Difficulty: 3Frequency: 3Problem:Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.For example,Given 1-

2013-09-04 16:23:57 370

原创 LeetCode 79: Word Search

Difficulty: 3Frequency: 4Problem:Given a 2D board and a word, find if the word exists in the grid.The word can be constructed from letters of sequentially adjacent cell, where "adjac

2013-09-04 15:47:56 377

原创 LeetCode 78: Subsets

Difficulty: 3Frequency: 4Problem:Given a set of distinct integers, S, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set

2013-09-04 15:01:16 442

原创 LeetCode 96: Unique Binary Search Tree

Difficulty: 3Frequency: 1Problem:Given n, how many structurally unique BST's (binary search trees) that store values 1...n?For example,Given n = 3, there are a total of 5 unique

2013-09-03 16:18:48 494

原创 LeetCode 98: Validate Binary Search Tree

Difficulty: 3Frequency: 5Problem:Given a binary tree, determine if it is a valid binary search tree (BST).Assume a BST is defined as follows:The left subtree of a node contains

2013-09-03 15:49:27 431

原创 LeetCode 106: Construct Binary Tree from Inorder and Postorder Traversal

Difficulty: 3Frequency: 3Problem:Given inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.Solution:

2013-09-03 14:37:39 658

原创 LeetCode 107: Binary Tree Level Order Traversal II

Difficulty: 3Frequency: 1Problem:Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root).Fo

2013-09-03 14:03:27 455

原创 LeetCode 114: Flatten Binary Tree to Linked List

Difficulty: 3Frequency: 3Problem:Given a binary tree, flatten it to a linked list in-place.For example,Given 1 / \ 2 5 / \ \ 3 4 6

2013-09-03 13:13:19 395

原创 LeetCode 116: Populating Next Right Pointers in Each Node

Difficulty: 3Frequency: 3Problem:Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; }Populate each

2013-09-03 10:18:56 420

原创 LeetCode 120: Triangle

Difficulty: 3Frequency: 1Problem:Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given the fo

2013-09-03 08:27:29 396

原创 LeetCode 122: Best Time to Buy and Sell Stock II

Difficulty: 3Frequency: 1Problem: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. You may comp

2013-09-03 08:00:44 787

原创 LeetCode 74: Search A 2D Matrix

Difficulty: 3Frequency: 3Problem:Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following properties:Integers in each row are

2013-09-02 20:01:38 407

原创 LeetCode 73: Set Matrix Zeroes

Difficulty: 3Frequency: 5Problem:Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.Follow up:Did you use extra space?A straight for

2013-09-02 16:47:34 423

原创 LeetCode 64: Minimum Path Sum

Difficulty: 3Frequency: 3Problem:Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path.

2013-09-02 15:26:32 396

原创 LeetCode 63: Unique Paths II

Difficulty: 3Frequency: 3Problem:Follow up for "Unique Paths":Now consider if some obstacles are added to the grids. How many unique paths would there be?An obstacle and empty sp

2013-09-02 15:03:27 375

原创 LeetCode 61: Rotate List

Difficulty: 3Frequency: 2Problem:Given a list, rotate the list to the right by k places, where k is non-negative.For example:Given 1->2->3->4->5->NULL and k = 2,return 4->5->1-

2013-09-02 14:18:18 385

原创 LeetCode 59: Spiral Matrix II

Difficulty: 3Frequency: 2Problem:Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.For example,Given n = 3,You should return the fo

2013-09-02 13:52:37 434

原创 LeetCode 55: Jump Game

Difficulty: 3Frequency: 2Problem: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 maxim

2013-09-02 13:16:46 750

原创 LeetCode 53: Maximum Subarray

Difficulty: 3Frequency: 3Problem:Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [−2,1,−3,4,−1,2,

2013-09-01 21:37:46 564

原创 LeetCode 39: Combination Sum

Difficulty: 3Frequency: 3Problem:Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same

2013-09-01 20:52:56 292

原创 LeetCode 23: Merge K Sorted List

Difficulty: 3Frequency: 4Problem:Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.Solution:/** * Definition for singly-linked li

2013-09-01 17:54:43 449

原创 LeetCode 22: Generate Parentheses

Difficulty: 3Frequency: 4Problem:Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses.For example, given n = 3, a solution set is:

2013-09-01 17:23:13 537

原创 LeetCode 18: 4Sum

Difficulty: 3Frequency: 2Problem:Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array

2013-09-01 16:48:30 584

原创一道Google笔试题--关于预编译

1.2 对以下程序，正确的输出结果是#define SUB(x,y) x-y#define ACCESS_BEFORE(element,offset,value) *SUB(&element, offset)=valueint main(){ int array[10]= {1,2,3,4,5,6,7,8,9,10}; int i; ACCESS_BEFORE(array[5],

2013-09-01 14:57:52 551

原创 LeetCode 17: Letter Combinations of a Phone Number

Difficulty: 3Frequency 3Problem:Given a digit string, return all possible letter combinations that the number could represent.A mapping of digit to letters (just like on the telephon

2013-09-01 14:44:41 506

(SIGGRAPH 04)Fast Hierarchical Importance Sampling with Blue Noise Properties的源码

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