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缓冲区ByteBuffer简单说明
ByteBuffer position limit flip...
分类:其他好文   时间:2014-06-05 10:23:51    阅读次数:185
LeetCode: Search a 2D Matrix [074]
【题目】 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 sorted from left to right. The first integer of each row is greater than the last integer of the previous ...
分类:其他好文   时间:2014-06-05 08:28:43    阅读次数:321
LeetCode: Set Matrix Zeroes [073]
【题目】 Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 【题意】 给定一个mXn的矩阵,如果其中的元素为0,则对应的行和列都用0填充。 不能申请额外的空间。 【思路】 第一行和第一列空出来标记需要置0的列和行 第一遍扫描: 扫描第一行,判断第一行是否需要清零 ...
分类:其他好文   时间:2014-06-05 08:07:11    阅读次数:229
LeetCode: Climbing Stairs [070]
【题目】 You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top? 【题意】 有个梯子有n阶,每次只能爬1阶或者2阶,为爬到梯子顶共有多少种爬法 【思路】 依次确定跳到每一阶上的爬法数目 这其实是一...
分类:其他好文   时间:2014-06-05 07:16:08    阅读次数:203
LeetCode: Valid Number [066]
【题目】 Validate if a given string is numeric. Some examples: "0" => true " 0.1 " => true "abc" => false "1 a" => false "2e10" => true Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before imple...
分类:其他好文   时间:2014-06-04 23:45:09    阅读次数:388
LeetCode: Sqrt(x) [069]
【题目】 Implement int sqrt(int x). Compute and return the square root of x. 【题意】 实现 int sqrt(int x),计算并返回平方根。 【思路】 用牛队迭代法求解,本题可以转化为求 f(n)=n^2-x=0的解 用牛顿迭代法不断逼近真实解,假设曲线上有点(n[i],f(n[i])) 则这点出的斜率为2ni, 通过该点的直线方程为 y=2n[i](...
分类:其他好文   时间:2014-06-04 23:38:20    阅读次数:325
LeetCode: Text Justification [068]
【题目】 Given an array of words and a length L, format the text such that each line has exactly L characters and is fully (left and right) justified. You should pack your words in a greedy approach; that is, pack as many words as you can in each line. Pad ...
分类:其他好文   时间:2014-06-04 22:37:46    阅读次数:389
LeetCode: Remove Duplicates from Sorted List [082]
【题目】 Given a sorted linked list, delete all duplicates such that each element appear only once. For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3. 【题意】 给定一个已排序的链表,删除其中的重复元素 【思路】 维护两个指针prev和cur, cur指针负责扫描链表,prev指向cur的前一...
分类:其他好文   时间:2014-06-03 04:05:39    阅读次数:231
LeetCode: Search in Rotated Sorted Array II [081]
【题目】 Follow up for "Search in Rotated Sorted Array": What if duplicates are allowed? Would this affect the run-time complexity? How and why? Write a function to determine if a given target is in the array. 【题意】 在“Search in Rotated Sorted Array”的基...
分类:其他好文   时间:2014-06-03 01:55:38    阅读次数:173
LeetCode: Remove Duplicates from Sorted List II [083]
【题目】 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->3->3->4->4->5, return 1->2->5. Given 1->1->1->2->3, return 2->3. 【题意】 给定一个有序链表,删出其中重复出现的值...
分类:其他好文   时间:2014-05-31 21:14:11    阅读次数:333
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