1572. Matrix Diagonal SumEasy Topics Companies Hint Given a square matrix mat, return the sum of the matrix diagonals. Only include the sum of all the elements on the primary diagonal and all the elements on the
【leetcode】1572. Matrix Diagonal Sum 题目如下: Given a square matrixmat, return the sum of the matrix diagonals. Only include the sum of all the elements on the primary diagonal and all the elements on the secondary diagonal that are not part of the primary diagonal. Example 1: Input: m...
LeetCode #1572. Matrix Diagonal Sum 题目1572. Matrix Diagonal Sum解题方法遍历数组每次累加mat[i][j]和mat[i][len(mat)-1-j],如果j == len(mat) - 1 - j的话就去掉一个mat[i][j],最后返回Sum。 时间复杂度:O(mn) 空间复杂度:O(1)代码class Solution: def diagonalSum(self, mat: List[Lis...
1329. Sort the Matrix Diagonally # 题目 # A matrix diagonal is a diagonal line of cells starting from some cell in either the topmost row or leftmost column and going in the bottom-right direction until reaching the matrix’s end. For example, the matr
The transpose of a matrix is the matrix flipped over it’s main diagonal, switching the row and column indices of the matrix. Example 1: Input: [[1,2,3],[4,5,6],[7,8,9]] Output: [[1,4,7],[2,5,8],[3,6,9]] Example 2: Input: [[1,2,3],[4,5,6]] Output: [[...
0494-Target-Sum 0497-Random-Point-in-Non-overlapping-Rectangles 0498-Diagonal-Traverse 0501-Find-Mode-in-Binary-Search-Tree 0509-Fibonacci-Number 0518-Coin-Change-2 0519-Random-Flip-Matrix/cpp-0519 CMakeLists.txt main.cpp main2.cpp main3.cpp main4.cpp 0528-Random-Pic...
注意:矩阵(A)是一个长方形矩阵,不一定是方阵,另外(\Sigma)和矩阵(A)的维度相同,并且其包含一个对角子矩阵(diagonal submatrix)。 2. 图解SVD 对于奇异值分解可以从两个角度进行理解:一是将SVD视为对基向量组(bases),即坐标系的一顺序变换,二是将SVD视为对于数据点的变换。
方法: 先遍历主轴,再遍历次轴,然后判断是否有重叠的位置,然后删除重叠的位置,判断条件是列数是否为奇数。 classMatrixDiagonalSum{fundiagonalSum(mat:Array<IntArray>):Int{varsum=0for(indexinmat[0].indices){sum+=mat[index][index]}for(indexinmat[0].lastIndex downTo0){sum+=mat[index][mat.lastInd...
The prefix eigen- is adopted from the German word eigen for “own-“ Remember some properties The trace of A, defined as the sum of its diagonal elements, is also the sum of all eigenvalues: The determinant of A is the product of all eigenvalues ...
0494-Target-Sum 0497-Random-Point-in-Non-overlapping-Rectangles 0498-Diagonal-Traverse 0501-Find-Mode-in-Binary-Search-Tree 0509-Fibonacci-Number 0518-Coin-Change-2 0519-Random-Flip-Matrix 0528-Random-Pick-with-Weight 0530-Minimum-Absolute-Difference-in-BST 0541-Reverse-Str...