Chole1122-优快云博客

原创 Maximum Product Subarray

Find the contiguous subarray within an array (containing at least one number) which has the largest product.For example, given the array [2,3,-2,4],the contiguous subarray [2,3] has the largest pr

2014-10-05 14:07:35 546

原创 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 numb

2014-09-14 08:33:20 444

原创 Simplify Path

Given an absolute path for a file (Unix-style), simplify it.For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c"click to show corner cases.Corner Cases:Did you co

2014-08-25 09:48:51 444

原创 Multiply Strings

Given two numbers represented as strings, return multiplication of the numbers as a string.Note: The numbers can be arbitrarily large and are non-negative.Have you been asked this

2014-08-23 13:12:22 359

原创 Spiral Matrix

Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.For example,Given the following matrix:[ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7, 8, 9 ]]You

2014-08-23 10:14:22 500

原创 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].Have you been asked this question in a

2014-08-23 09:54:40 434

原创 Sudoku Solver

public class Solution { public void solveSudoku(char[][] board) { solve(board); } public boolean solve(char[][] board) { for (int i = 0; i < 9; i++) { for (int

2014-08-23 07:04:14 381

原创 Maximal Rectangle

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing all ones and return its area.Have you been asked this question in an interview?

2014-08-22 06:21:45 393

原创 Rotate List

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->2->3->NULL.Have you been asked

2014-08-20 05:49:16 382

原创 Sqrt(x)

Implement int sqrt(int x).Compute and return the square root of x.Have you been asked this question in an interview?

2014-08-20 04:09:38 443

原创 First Missing Positive

Given an unsorted integer array, find the first missing positive integer.For example,Given [1,2,0] return 3,and [3,4,-1,1] return 2.Your algorithm should run in O(n) time and uses constant spa

2014-08-20 01:48:01 375

原创 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 devise a

2014-08-16 10:57:31 466

原创 Anagrams

Given an array of strings, return all groups of strings that are anagrams.Note: All inputs will be in lower-case.Have you been asked this question in an interview? 开始没读懂题目意思，别人

2014-08-15 08:34:45 790

原创 Reverse Nodes in k-Group

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is.

2014-08-15 05:00:21 435

原创 Gas Station

There are N gas stations along a circular route, where the amount of gas at station i is gas[i].You have a car with an unlimited gas tank and it costs cost[i] of gas to travel from station i to it

2014-08-14 04:52:16 558

原创 Unique Binary Search Trees II

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 unique BST's shown below. 1 3

2014-08-14 04:02:36 384

原创 Surrounded Regions

Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'.A region is captured by flipping all 'O's into 'X's in that surrounded region.For example,X X X XX O O XX X

2014-08-08 09:08:50 422

原创 Flatten Binary Tree to Linked List

Given a binary tree, flatten it to a linked list in-place.For example,Given 1 / \ 2 5 / \ \ 3 4 6The flattened tree should look like: 1 \

2014-08-08 06:23:00 509

原创 Restore IP Addresses

Given a string containing only digits, restore it by returning all possible valid IP address combinations.For example:Given "25525511135",return ["255.255.11.135", "255.255.111.35"]. (Order do

2014-08-08 05:45:20 387

原创 Candy

There are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to the following requirements:Each child must have at least one

2014-08-07 13:33:46 496

原创 Trapping Rain Water

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.For example, Given [0,1,0,2,1,0,1,3,2,1,2,1],

2014-08-07 12:03:31 322

原创 Same Tree

Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical and the nodes have the same value.Have you b

2014-08-07 05:44:43 353

原创 Add Binary

Given two binary strings, return their sum (also a binary string).For example,a = "11"b = "1"Return "100".Have you been asked this question in an interview?

2014-08-06 13:43:30 496

原创 Populating Next Right Pointers in Each Node

Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; }Populate each next pointer to point to its next right node.

2014-08-06 08:31:09 352

原创 N-Queens

The n-queens puzzle is the problem of placing n queens on an n×n chessboard such that no two queens attack each other.Given an integer n, return all distinct solutions to the n-queens puzzle.Eac

2014-08-06 06:50:36 333

原创 Spiral Matrix II

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 following matrix:[ [ 1, 2, 3 ], [ 8, 9, 4 ], [

2014-08-03 00:08:53 392

原创 Rotate Image

You are given an n x n 2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Follow up:Could you do this in-place?Have you been asked this question in an

2014-08-01 06:32:14 448

原创 N-Queens II

Follow up for N-Queens problem.Now, instead outputting board configurations, return the total number of distinct solutions.Have you been asked this question in an interview?

2014-08-01 05:18:36 507

原创 Integer to Roman

Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.Have you been asked this question in an interview?

2014-07-31 10:39:31 545

原创 Set Matrix Zeroes

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.click to show follow up.Follow up:Did you use extra space?A straight forward solution using O(mn) s

2014-07-29 11:45:00 591

原创 Insert Interval

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initially sorted according to their start times.Examp

2014-07-29 05:54:27 439

原创 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 numb

2014-07-26 10:21:45 386

原创 Word Search

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 "adjacent" cells are those horizontally or vertically n

2014-07-26 04:35:10 406

原创 Construct Binary Tree from Inorder and Postorder Traversal

Given inorder and postorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.Have you been asked this question in an

2014-07-25 10:46:28 509

原创 Construct Binary Tree from Preorder and Inorder Traversal

Given preorder and inorder traversal of a tree, construct the binary tree.Note:You may assume that duplicates do not exist in the tree.Have you been asked this question in an int

2014-07-25 09:02:57 373

原创 Pow(x, n)

Implement pow(x, n).Have you been asked this question in an interview?

2014-07-25 06:47:57 400

原创 Generate Parentheses

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:"((()))", "(()())", "(())()", "()(())", "()()()

2014-07-25 04:41:18 284

原创 Container With Most Water

Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Fin

2014-07-25 03:41:23 400

原创 ZigZag Conversion

The string "PAYPALISHIRING" is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)P A H NA P L S I

2014-07-14 14:17:00 364

原创 Longest Palindromic Substring

Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring.Have

2014-07-14 09:04:05 607

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