发布时间：2015-03-05 09:16:01
Write a function to find the longest common prefix string amongst an array of strings.public class LongestCommonPrefix {public String longestCommonPrefix(String[] strs) {if(strs.length==0)return "";String tempString=strs[0]; for (int i = 1; i < strs.length; i++) { i.........【阅读全文】
发布时间：2015-02-16 21:38:21
灰度直方图是数字图像中最简单且有用的工具，这一篇主要总结OpenCV中直方图CvHistogram的结构和应用。OpenCV中的直方图CvHistogram注意我们在上面理解直方图的意义时更多把他想象成一幅“图”，继而理解图中横坐标，纵坐标的意义。而在OpenCV中，应该更多把直方图看做“数据结构”来理解。OpenCV中用CvHistogram.........【阅读全文】
发布时间：2015-01-30 12:35:29
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 constant space solution?二叉排序树中有两个节点被交换了，要求把树恢复成二叉排序树。中序遍历二叉树生.........【阅读全文】
发布时间：2015-01-29 16:55:19
listview的控件复用了，需要把每个ToggleButton的状态保存起来private HashMap<Integer,Boolean> states=new HashMap<>();toogle.setOnCheckedChangeListener(new OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton arg0, boolean arg1) {// TODO Auto-gen.........【阅读全文】
发布时间：2015-01-29 12:39:56
/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?矩阵旋转问题：先对正对角线轴对称，在对垂直最中间的线轴对称。public class RotateImage {public void rotate(int[][] matrix) {int row=matrix.length.........【阅读全文】
