/* * 363. Max Sum of Rectangle No Larger Than K * 2016-7-15 by Mingyang */ public int maxSumSubmatrix(int[][] matrix, int target) { int row = matrix.length; if(row==0)return 0; int col = matrix[0].length; int m = Math.min(row,col); int n = Math.max(r…

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Input: matrix = [[1,0,1],[0,-2,3]], k = 2 Output: 2 Explanation: Because the sum of rectangle [[0, 1],…

题目描述: Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. 解题思路: 根据题意,寻找二维数组中所有可以组成的矩形中面积不超过k的最大值,所以必须要求出可能组成的矩形的面积并与k比较求出最终结果.这里为了最终不超时,可以在一下方面进行优化: 1.设置一个数组比较当前列(或…

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k.Example:Given matrix = [  [1,  0, 1],  [0, -2, 3]]k = 2The answer is 2. Because the sum of rectangle [[0, 1], [-2…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址: https://leetcode.com/problems/max-sum-of-rectangle-no-larger-than-k/description/ 题目描述: Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix su…

Leetcode363 思路: 一种naive的算法就是枚举每个矩形块, 时间复杂度为O((mn)^2), 可以做少许优化时间复杂度可以降低到O(mnnlogm), 其中m为行数, n为列数. 先求出任意两列之间的所有数的和, 然后再枚举任意两行之间的和, 而我们优化的地方就在后者. 我们用s[x]来表示第x行从a列到b列的和. 遍历一遍从第0行到最后一行的求和数组, 并依次将其放到二叉搜索树中, 这样当我们知道了从第0行到当前行的和的值之后, 我们就可以用lower_bound在O(log n…

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Given matrix = [ [1, 0, 1], [0, -2, 3] ] k = 2 The answer is 2. Because the sum of rectangle [[0, 1], […

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Given matrix = [ [1, 0, 1], [0, -2, 3] ] k = 2 The answer is 2. Because the sum of rectangle [[0, 1], […

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Given matrix = [ [1, 0, 1], [0, -2, 3] ] k = 2 The answer is 2. Because the sum of rectangle [[0, 1], […

Given a non-empty 2D matrix matrix and an integer k, find the max sum of a rectangle in the matrix such that its sum is no larger than k. Example: Input: matrix = [[1,0,1],[0,-2,3]], k = 2 Output: 2 Explanation: Because the sum of rectangle [[0, 1],…