311. Sparse Matrix Multiplication 稀疏矩阵的计算.稀疏矩阵的特点是有大量的0,如果采用暴力算法则比然会有很多无意义的计算. C[ i ][ j ] += A[ i ] [ k ] * B[ k ] [ j ] 我们首先遍历A数组,要确保A[i][k]不为0,才继续计算,然后我们遍历B矩阵的第k行,如果B[K][J]不为0,我们累加结果矩阵res[i][j] += A[i][k] * B[k][j] class Solution { public int[][]…

Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix = [ [ 1, 5…

378. 有序矩阵中第K小的元素 378. Kth Smallest Element in a Sorted Matrix 题目描述 给定一个 n x n 矩阵,其中每行和每列元素均按升序排序,找到矩阵中第 k 小的元素. 请注意,它是排序后的第 k 小元素,而不是第 k 个元素. 每日一算法2019/5/16Day 13LeetCode378. Kth Smallest Element in a Sorted Matrix 示例: matrix = [ [ 1, 5, 9], [10, 11,…

[LeetCode]378. Kth Smallest Element in a Sorted Matrix 解题报告(Python) 标签: LeetCode 题目地址:https://leetcode.com/problems/kth-smallest-element-in-a-sorted-matrix/description/ 题目描述: Given a n x n matrix where each of the rows and columns are sorted in ascen…

题目: Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix = [ […

Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix = [ [ 1, 5…

题目: Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] | 1 0 0 | | 7 0 0 | | 7 0 0 | AB =…

题目: Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Example: matrix = [ [ 1, 5, 9], [10, 11, 13], [12, 13, 15] ], k = 8, return 13. 分析:采用优先队列,自定义比较规则,使得最小元素排在队首. 代码:…

Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: Input: A = [ [ 1, 0, 0], [-1, 0, 3] ] B = [ [ 7, 0, 0 ], [ 0, 0, 0 ], [ 0, 0, 1 ] ] Output: | 1 0 0 | | 7 0 0 | | 7…

Question: Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth smallest element in the sorted order, not the kth distinct element. Example: matrix…