11.6 Given an M x N matrix in which each row and each column is sorted in ascending order, write a method to find an element. LeetCode上的原题,请参见我之前的博客Search a 2D Matrix 搜索一个二维矩阵和Search a 2D Matrix II 搜索一个二维矩阵之二. class Solution { public: bool findElemen…

给定一个 n × n 的二维矩阵表示一个图像. 将图像顺时针旋转 90 度. 说明: 你必须在原地旋转图像,这意味着你需要直接修改输入的二维矩阵.请不要使用另一个矩阵来旋转图像. 示例 : 给定 matrix = [ [1,2,3], [4,5,6], [7,8,9] ], 原地旋转输入矩阵,使其变为: [ [7,4,1], [8,5,2], [9,6,3] ] 思路: 1.我的思路是重外围四个角往里面缩小,所以第一次循环的个数可以减半,减少循环次数 2.第二个循环依次处理四个角位置的互换,/*…

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 in ascending from left to right. Integers in each column are sorted in ascending from top to bottom.…

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 ro…

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 ro…

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 in ascending from left to right. Integers in each column are sorted in ascending from top to bottom.…

问题描述: 求一个矩阵中最大的二维矩阵(元素和最大).如: 1 2 3 4 5 6 7 8 9 10 1 2 3 4 5 中最大的是: 4 5 9 10   分析: 2*2子数组的最大和.遍历求和,时间复杂度为O(mn).   代码实现: // 35.cc #include <iostream> #include <climits> using namespace std; ], int m, int n) { int max_sum = INT_MIN; int sum; ; i…

安装qrcode库和PIL库 在命令行中分别输入pip install qrcode 和pip install pillow 导入库格式如下: import PIL import qrcode 下面以生成一个带图标的二维码为例 from PIL import Image import qrcode qr = qrcode.QRCode( version=2, error_correction=qrcode.constants.ERROR_CORRECT_H, box_size=10, borde…

一个不错的PHP二维数组排序函数简单易用存用 传入数组,传入排序的键,传入排序顺序 public function array_sort($arr,$keys,$type='asc') { $keysvalue = $new_array = array(); foreach ($arr as $k=>$v){ $keysvalue[$k] = $v[$keys]; } if($type == 'asc'){ asort($keysvalue); }else{ arsort($keysvalue)…

因为我们需要用户扫码进入小程序,每一个货柜都有一个对应的二维码,当然每个二维码里的信息也不一样.用户扫码进入小程序之后,二维码的信息会以参数q带进去,而我们只能在onLoad事件中拿到这个参数, 但是获取到的信息是经过encodeURIComponent()编码的,注意不是encodeURI()编码的,所以需要用decodeURIComponent()解码,而不能用decodeURI(),这个在文档上没太说明白,见文档  mp.weixin.qq.com/debug/wxadoc/introdu…