11 2016 档案
摘要：Divide two integers without using multiplication, division and mod operator. If it is overflow, return MAX_INT. 1. nagitive 2. overflow Another exampl
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摘要：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 poss
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摘要：Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping. Note: Exam
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摘要：There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided input is the start and end coordinates of the hor
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摘要：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
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摘要：Given two numbers represented as strings, return multiplication of the numbers as a string. Note: The numbers can be arbitrarily large and are non-neg
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摘要：Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complementmethod is used. Note: Example 1: Example 2:
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摘要：Given an unsorted array of integers, find the length of longest increasing subsequence. For example,Given [10, 9, 2, 5, 3, 7, 101, 18],The longest inc
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摘要：Given an 2D board, count how many different battleships are in it. The battleships are represented with 'X's, empty slots are represented with '.'s. Y
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摘要：You are given two linked lists representing two non-negative numbers. The most significant digit comes first and each of their nodes contain a single
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摘要：Note: This is an extension of House Robber. After robbing those houses on that street, the thief has found himself a new place for his thievery so tha
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摘要：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo
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摘要：There is a fence with n posts, each post can be painted with one of the k colors. You have to paint all the posts such that no more than two adjacent
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摘要：Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example,If n = 4 and k = 2, a solution is:
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摘要：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: You s
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摘要：Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list. For example,Given 1->2
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摘要：Follow up for "Remove Duplicates":What if duplicates are allowed at most twice? For example,Given sorted array nums = [1,1,1,2,2,3], Your function sho
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摘要：Given an array of integers A and let n to be its length. Assume Bk to be an array obtained by rotating the array A k positions clock-wise, we define a
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摘要：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? The idea was
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摘要：Given a non-empty string check if it can be constructed by taking a substring of it and appending multiple copies of the substring together. You may a
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摘要：Given an absolute path for a file (Unix-style), simplify it. For example,path = "/home/", => "/home"path = "/a/./b/../../c/", => "/c" click to show co
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摘要：The gray code is a binary numeral system where two successive values differ in only one bit. Given a non-negative integer n representing the total num
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摘要：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 sp
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摘要：Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or
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摘要：Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or
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摘要：Given a string, sort it in decreasing order based on the frequency of characters. Example 1: Example 2: Example 3:
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摘要：Compare two version numbers version1 and version2.If version1 > version2 return 1, if version1 < version2 return -1, otherwise return 0. You may assum
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摘要：Given n points in the plane that are all pairwise distinct, a "boomerang" is a tuple of points (i, j, k) such that the distance between i and j equals
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摘要：Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. Credits:Special thanks t
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摘要：Given a non-empty integer array of size n, find the minimum number of moves required to make all array elements equal, where a move is incrementing n
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摘要：Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has a g
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摘要：Given a sequence of words, check whether it forms a valid word square. A sequence of words forms a valid word square if the kth row and column read th
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摘要：463. Island Perimeter 463. Island Perimeter You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents wat
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摘要：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 repeat
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摘要：冒泡排序 Bubble Sort O(N^2) 选择排序 select sort 是一种简单直观的排序算法。它的工作原理如下。首先在未排序序列中找到最小（大）元素，存放到排序序列的起始位置，然后，再从剩余未排序元素中继续寻找最小（大）元素，然后放到已排序序列的末尾。以此类推，直到所有元素均排序完毕。
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摘要：1.home page $rails generate controller StaticPages home help 2. test rails test 3. add CSS gem bootstrap-sass in gemfile 或者直接在assert static.scss改 $ to
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摘要：1.安装ruby 和 rails $ rvm use ruby-2.3.0$ gem install rails$ rails --version //run ruby$ irb $ cd workspace$ rails new blog$ rails server //localhost:300
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