problem 840. Magic Squares In Grid solution: class Solution { public: int numMagicSquaresInside(vector<vector<int>>& grid) { ].size(); ; ; i<m-; ++i) { ; j<n-; ++j) { if(isvalid(grid, i, j)) cnt++; } } return cnt; } bool isvalid(vect…

开头 这是每周比赛中的第一道题,博主试了好几次坑后才勉强做对了,第二道题写的差不多结果去试时结果比赛已经已经结束了(尴尬),所以今天只记录第一道题吧 题目原文 Magic Squares In Grid 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.…

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 利用河图规律 暴力解法 日期 题目地址:https://leetcode.com/problems/magic-squares-in-grid/description/ 题目描述 A 3 x 3 magic square is a 3 x 3 grid filled with distinct numbers from 1 to 9 such tha…

class Solution { public: int numMagicSquaresInside(vector<vector<int>>& grid) { ; int szx=grid.size(); ].size(); ;i<szx-;i++) { ;j<szy-;j++) { ][j+]==&&judge(grid,i,j)) count++; } } return count; } bool judge(vector<vector…

题目链接:https://leetcode.com/problems/magic-squares-in-grid/description attention:注意给定的数字不一定是1-9. time:5ms 本人的解法过于粗糙,看出了中间必须是5,然后比较每行每列每对角线的值是否相等. class Solution { public: int numMagicSquaresInside(vector<vector<int>>& grid) { int n = grid.si…

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…

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…

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…

这是悦乐书的第326次更新,第349篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第196题(顺位题号是840).3 x 3魔方是一个3 x 3网格,填充了从1到9的不同数字,这样每行,每列和两个对角线都具有相同的总和. 给定一个整数网格,求有多少个3 x 3"魔方"子网格? (每个子网格都是连续的).例如: 输入:[[4,3,8,4],[9,5,1,9],[2,7,6,2]] 输出:1 说明: 以下子网格是一个3 x 3魔方: 4 3 8 9 5 1 2…

问题 该文章的最新版本已迁移至个人博客[比特飞],单击链接 https://www.byteflying.com/archives/3752 访问. 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 m * 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). 输入: [[4,3,8,4],       [9,5,1,9],       [2,7,6,2]…