Set Matrix ZeroesGiven a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. click to show follow up. Follow up:Did you use extra space?A straight forward solution using O(mn) space is probably a bad idea.A simple im…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. click to show follow up. Follow up: Did you use extra space?A straight forward solution using O(mn) space is probably a bad idea.A simple improvement uses O…

原题地址:https://oj.leetcode.com/problems/set-matrix-zeroes/ 题意:Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 解题思路:分别记录两个向量x, y,保存行和列是否有0,再次遍历数组时查询对应的行和列然后修改值. 代码: class Solution: # @param matrix, a list of…

http://oj.leetcode.com/problems/set-matrix-zeroes/ 因为空间要求原地,所以一些信息就得原地存储.使用第一行第一列来存本行本列中是否有0.另外对于第一个元素[0][0],需要额外处理. #include <iostream> #include <vector> using namespace std; class Solution { public: void setZeroes(vector<vector<int>…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 原题链接:https://oj.leetcode.com/problems/set-matrix-zeroes/ 题目:给定一个m * n 的矩阵.假设有一个元素是0.将其所在行和列设为0. 思路:先记录下是0 的元素的位置.再去置0. public void setZeroes(int[][] matrix)…

题意: 给一个n*m的矩阵,如果某个格子中的数字为0,则将其所在行和列全部置为0.(注:新置的0不必操作) 思路: 主要的问题是怎样区分哪些是新来的0? 方法(1):将矩阵复制多一个,根据副本来操作原矩阵. 方法(2):发现空间还可以用O(n)来解决. 方法(3):若m[i][j]=0,则将m[i][0]和m[0][j]标记为0,表示i行和j列都为0,但是这样的问题是,首行和首列会冲突?那就将首列先预处理一下,用另外的常量标记就行了.时间复杂度O(n*m),空间O(1). class Solut…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. click to show follow up. Follow up: Did you use extra space?A straight forward solution using O(m n) space is probably a bad idea.A simple improvement uses…

1. Rotate List Given a list, rotate the list to the right by k places, where k is non-negative. Example: Given 1->2->3->4->5->NULL and k = 2, return 4->5->1->2->3->NULL. 思路:这题感觉有点没有说清楚,如果k大于了链表长度该怎么办呢?这个时候怎么确定旋转位置呢?从右往左数,超出数组…

Set Matrix Zeroes Total Accepted: 18139 Total Submissions: 58671My Submissions Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. click to show follow up. 题意:给定矩阵,假设矩阵的某个位置为0.则把那一行那一列的全部元素都置为0 思路:用两个bool数组,分…

Set Matrix Zeroes Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. click to show follow up. Follow up: Did you use extra space?A straight forward solution using O(mn) space is probably a bad idea.A simple…

Set Matrix Zeroes (Link: https://oj.leetcode.com/problems/set-matrix-zeroes/) Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. click to show follow up. Follow up: Did you use extra space? A straight forwar…

1.7 Write an algorithm such that if an element in an MxN matrix is 0, its entire row and column are set to 0. LeetCode中的原题,请参见我之前的博客Set Matrix Zeroes 矩阵赋零.…

Spiral Matrix IIGiven an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order. For example,Given n = 3, You should return the following matrix:[ [ 1, 2, 3 ], [ 8, 9, 4 ], [ 7, 6, 5 ]] SOLUTION 1: 还是与上一题Spiral Matrix类似…

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. Follow up: Did you use extra space?A straight forward solution using O(mn) space is probably a bad idea.A simple improvement uses O(m + n) space, but sti…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 思路:不能用额外空间,就用矩阵的第一行和第一列来标记这一行或这一列是否需要置0. 用两个bool量记录第一行和第一列是否需要置0 大神的代码和我的代码都是这个思路,但是我在画0的时候是行列分开处理的,大神的代码是一起处理的 void setZeroes(vector<vector<int> > &…

题目来源: https://leetcode.com/problems/set-matrix-zeroes/ 题意分析: 输入一个m×n矩阵,如果出现有0,那么将对应的行和列都变成0. 题目思路: 简单的一个想法是记录行列哪些出现过0,那么将其对应到的行列转成0. 代码(Python): class Solution(object): def setZeroes(self, matrix): """ :type matrix: List[List[int]] :rtype:…

原题链接: http://oj.leetcode.com/problems/set-matrix-zeroes/ 这是一个矩阵操作的题目,目标非常明白,就是假设矩阵假设有元素为0,就把相应的行和列上面的元素都置为0.这里最大的问题就是我们遇到0的时候不能直接把矩阵的行列在当前矩阵直接置0,否则后面还没訪问到的会被当成原来是0,最后会把非常多不该置0的行列都置0了.一个直接的想法是备份一个矩阵,然后在备份矩阵上推断,在原矩阵上置0,这样当然是能够的,只是空间复杂度是O(m*n),不是非常理想.上面…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)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. (二)解题 题目大意:给定一个M*N的数组,如果(i,j)为0,则将第i行第j列全部元素置为0. 这道题目意思很简单,如果考虑…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place. Example 1: Input: [   [1,1,1],   [1,0,1],   [1,1,1] ] Output: [   [1,0,1],   [0,0,0],   [1,0,1] ] Example 2: Input: [   [0,1,2,0],   [3,4,5,2],   [1,3,1,5]…

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. click to show follow up. Follow up: Did you use extra space? A straight forward solution using O(mn) space is probably a bad idea. A simple improvement…

问题描述:将二维数组中值为0的元素,所在行或者列全set为0:https://leetcode.com/problems/set-matrix-zeroes/ 问题分析:题中要求用 constant space 的辅助空间.自然想到位优化.一个int可以存储31个元素的信息.这里刚好用到了字符串论文里面常用的优化处理方法.类似桶分的思想.好吧,这么看来这长时间的论文没白看. 附上代码: void setZeroes(vector<vector<int>>& matrix)…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-place. Example 1: Input: [   [1,1,1],   [1,0,1],   [1,1,1] ] Output: [   [1,0,1],   [0,0,0],   [1,0,1] ] Example 2: Input: [   [0,1,2,0],   [3,4,5,2],   [1,3,1,5]…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 原地操作 新建数组 队列 日期 题目地址:https://leetcode.com/problems/set-matrix-zeroes/description/ 题目描述 Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in-pl…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 解题思路: 题目乍一看很简单,将矩阵当前为0的位的行列都置为0: 问题在于:当遇到一个已知0时,不能立刻将其行列置0,因为这样会把原本不是0的位更改,导致继续遍历的时候无法区分哪些是初始0,哪些是后改0: 有一个解决方法,就是先遍历所有位,记录所有初始为0的行列坐标,遍历一遍之后,再统一做更改: 但是这个解决方…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 解题思路: 用两个boolean数组row col表示行列是否有零即可,JAVA实现如下: public void setZeroes(int[][] matrix) { if (matrix.length == 0 || matrix[0].length == 0) return; boolean[] row…

原题地址 用矩形的第一行和第一列充当mask 代码: void setZeroes(vector<vector<int> > &matrix) { ].empty()) return; bool firstRow = false; bool firstCol = false; int m = matrix.size(); ].size(); ; i < m; i++) ] == ) { firstCol = true; break; } ; j < n; j++…

Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. Follow up: Did you use extra space?A straight forward solution using O(mn) space is probably a bad idea.A simple improvement uses O(m + n) space, but still…

给定一个m x n的矩阵,如果某个元素为0,则把该元素所在行和列全部置0. Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. 分析:最直接想到的就是遍历该矩阵,每遇到0就把它所在的行和列全部置0,但这是错的,因为这样会引入新的0到矩阵中.下一个比较容易相到的方法是:遍历矩阵,每遇到一个0元素就把它所在的行和列标记起来,最后再遍历matrix,若某元素的行或者列…

这个题乍一看非常easy,实际上还挺有技巧的.我最開始的想法是找一个特殊值标记.遇到一个0,把他所相应的行列中非零的元素标记成这个特殊值.0值保持不变,然后再从头遍历一次,碰到特殊值就转化成0. 问题是这个特殊值怎么确定,题目中没有把取值范围给出,我怀着侥幸的心理用了最大和最小的int,都被揪了出来..假设找一个不存在于数组中的值,这个复杂度太高了. 有没有其它更好的方法呢?当然有.这个思想非常巧妙,最后的结果是把所有0所在的行列都化成0,换句话说.化成0这个事情仅仅要标记出是哪一行以及哪一列就…

今天看到CSDN博客的勋章换了图表,同一时候也添加显示了博客等级,看起来都听清新的,感觉不错! [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. click to show follow up. Follow up: Did you use extra space? A straight forward solution using O(mn) sp…