A 3 x 3 magic square is a 3 x 3 grid filled with distinct numbers from 1 to 9 such that each row, column, and both diagonals all have the same sum. Given an grid of integers, how many 3 x 3 "magic square" subgrids are there?  (Each subgrid is co…

本题不清楚题意,从网上找到了python的解答,记录如下. class Solution: def numMagicSquaresInside(self, grid): ans, lrc = 0, [len(grid), len(grid[0])] def checkMagic(a,b, c, d, e, f, g ,h, i): return (sorted([a,b,c,d,e,f,g,h,i]) == [i for i in range(1,10)] and (a + b+c == d +…

3 x 3 的幻方是一个填充有从 1 到 9 的不同数字的 3 x 3 矩阵,其中每行,每列以及两条对角线上的各数之和都相等. 给定一个由整数组成的 N × N 矩阵,其中有多少个 3 × 3 的 "幻方" 子矩阵?(每个子矩阵都是连续的). 示例 1: 输入: [[4,3,8,4], [9,5,1,9], [2,7,6,2]] 输出: 1 解释: 下面的子矩阵是一个 3 x 3 的幻方: 438 951 276 而这一个不是: 384 519 762 总的来说,在本示例所给定的矩阵中…