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【leetcode刷题笔记】Populating Next Right Pointers in Each Node II
What if the given tree could be any binary tree? Would your previous solution still work?Note:You may only use constant extra space.For example,Given ...
分类:其他好文   时间:2014-07-22 08:37:34    阅读次数:289
【leetcode刷题笔记】Roman to Integer
Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.题解:转换的方法:从左往右扫描罗马字符,如果当前的字符对应的数字比上一个数字小,就直接加...
分类:其他好文   时间:2014-07-21 10:05:42    阅读次数:223
【leetcode刷题笔记】Integer to Roman
Given an integer, convert it to a roman numeral.Input is guaranteed to be within the range from 1 to 3999.题解:基本的罗马字符和数字对应如下表所示:罗马字符数字I1V5X10L50C100D50...
分类:其他好文   时间:2014-07-21 10:05:16    阅读次数:286
【leetcode刷题笔记】Plus One
Given a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significant digit is at...
分类:其他好文   时间:2014-07-21 10:00:12    阅读次数:185
【leetcode刷题笔记】Pow(x, n)
Implement pow(x,n).题解:注意两点:普通的递归把n降为n-1会超时,要用二分的方法,每次把xn= x[n/2]* x[n/2] * xn-[n/2]*2, [n/2]表示n除以2下取整。n有可能取负数,负数的时候,先计算pow(x,-n),然后返回1/pow(x,-n);代码如下:...
分类:其他好文   时间:2014-07-21 09:35:26    阅读次数:196
【leetcode刷题笔记】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 fo...
分类:其他好文   时间:2014-07-21 09:31:07    阅读次数:186
【leetcode刷题笔记】Remove Nth Node From End of List
Given a linked list, remove thenthnode from the end of list and return its head.For example, Given linked list: 1->2->3->4->5, and n = 2. After re...
分类:其他好文   时间:2014-07-21 09:02:01    阅读次数:161
【leetcode刷题笔记】Best Time to Buy and Sell Stock III
Say you have an array for which theithelement is the price of a given stock on dayi.Design an algorithm to find the maximum profit. You may complete a...
分类:其他好文   时间:2014-07-20 21:33:36    阅读次数:204
【leetcode刷题笔记】Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single ...
分类:其他好文   时间:2014-07-20 21:32:55    阅读次数:250
【leetcode刷题笔记】Validate Binary Search Tree
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 only n...
分类:其他好文   时间:2014-07-19 22:34:50    阅读次数:196
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