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原创操作系统原理课后习题8.8

先进行判断，EXACT 4SAT属于NP。然后将3SAT归约到EXACT 4ASAT就可以证明后者的NP完全性。我们已经知道对于任意一个3SAT实例，如果某个子句中包含相同文字多次，那么可以去掉多余的，如果同时包含了某个变量的肯定及否定，那么可以将这个变量去掉，再在每个子句中添加一些没用的辅助变量，这样就可以将每个子句所包含的文字数目扩充到四个。结果3SAT实例转换成了一个EX

2017-06-20 21:06:31 698

原创算法设计与应用基础系列19

Palindrome Linked ListGiven a singly linked list, determine if it is a palindrome.class Solution {public: bool isPalindrome(ListNode* head) { if(head==NULL||head-

2017-06-16 23:08:25 156

原创算法设计与应用基础系列18

Best Time to Buy and Sell Stock IVSay 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 compl

2017-06-15 23:51:53 176

原创算法设计与应用基础系列17

Largest NumberGiven a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.No

2017-06-15 21:07:07 184

原创算法设计与应用基础系列16

Factorial Trailing ZeroesGiven an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time complexity.Credits:Special thanks to @ts f

2017-06-15 18:43:28 240

原创算法设计与应用基础系列15

Two Sum II - Input array is sortedGiven an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number.The function

2017-06-15 16:45:46 170

原创算法设计与应用基础系列14

Min StackDesign a stack that supports push, pop, top, and retrieving the minimum element in constant time.push(x) -- Push element x onto stack.pop() -- Removes the element on top of th

2017-06-15 14:28:52 191

原创算法设计与应用基础系列13

152Maximum Product SubarrayFind 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 con

2017-06-15 01:22:56 155

原创算法设计与应用基础系列12

Evaluate Reverse Polish NotationEvaluate the value of an arithmetic expression in Reverse Polish Notation.Valid operators are +, -, *, /. Each operand may be an integer or another

2017-06-15 00:23:14 138

原创算法设计与应用基础系列11

Word BreakGiven a non-empty string s and a dictionary wordDict containing a list of non-empty words, determine if s can be segmented into a space-separated sequence of one or more dictionary

2017-06-14 23:30:38 170

原创算法设计与应用基础系列10

103. Binary Tree Zigzag Level Order TraversalGiven 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 l

2017-06-14 19:46:50 171

原创算法设计与应用基础系列9

Combination SumGiven a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same rep

2017-06-14 14:19:18 221

原创算法设计与应用基础系列8

Determine whether an integer is a palindrome. Do this without extra space.click to show spoilers.Some hints:Could negative integers be palindromes? (ie, -1)If you are thinking

2017-06-14 13:47:52 195

原创算法设计与应用基础系列7

Roman to IntegerGiven a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.Subscribe to see which companies asked this question.

2017-06-14 13:43:30 201

原创算法设计与应用基础系列6

Largest NumberGiven a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9], the largest formed number is 9534330.Note

2017-06-10 22:42:19 198

原创算法设计与应用基础系列5

168. Excel Sheet Column TitleGiven a positive integer, return its corresponding column title as appear in an Excel sheet.For example: 1 -> A 2 -> B 3 -> C ... 26

2017-06-10 19:20:37 161

原创算法设计与应用基础系列4

172. Factorial Trailing ZeroesGiven an integer n, return the number of trailing zeroes in n!.Note: Your solution should be in logarithmic time complexity.Credits:Special thanks to @t

2017-06-10 19:16:54 203

原创算法设计与应用基础系列3

118. Pascal's TriangleGiven numRows, generate the first numRows of Pascal's triangle.For example, given numRows = 5,Return[ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,

2017-05-16 18:42:01 161

原创算法设计与应用基础系列2

152. Maximum Product SubarrayFind 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

2017-05-16 18:41:09 159

原创算法设计与应用基础系列1

Merge To Sorted ListsMerge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.题解：要合并两个排序好的list。先创一个新的lis

2017-05-02 15:20:48 181

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