class Solution { public int shortestPathBinaryMatrix(int[][] grid) { int n = grid.length - 1; Queue<Pair<Integer,Integer>> q = new ArrayDeque<Pair<Integer,Integer>>(); q.add(new Pair(0, 0)); if (grid[0][0] == 1 || grid[n][n] == 1) return -1; // grid[0][0]是出...
grid = [[0,1],[1,0]] print(Solution().shortestPathBinaryMatrix(grid)) grid = [[0,0,0],[1,1,0],[1,1,0]] print(Solution().shortestPathBinaryMatrix(grid)) grid = [[1,0,0],[1,1,0],[1,1,0]] print(Solution().shortestPathBinaryMatrix(grid)) 1. 2. 3. 4. 5. 6. 7...
1classSolution {2public:3vector<vector<int>> dir={{-1,-1},{-1,0},{-1,1},{0,-1},{0,1},{1,-1},{1,0},{1,1}};4intshortestPathBinaryMatrix(vector<vector<int>>&grid) {5intn =grid.size();6intstep =0;7queue<pair<int,int>>q;8if(grid[0][0]==0&& grid[n-1][n-...
先给出最简洁的写法: classSolution:defshortestPathBinaryMatrix(self, grid: List[List[int]]) ->int: n=len(grid)ifgrid[0][0]orgrid[n-1][n-1]:return-1record= [(0,0,1)]fori, j, dinrecord:ifi == n-1andj == n-1:returndforx, yin((i-1,j-1),(i-1,j),(i-1,j+1),(...
1091. Shortest Path in Binary Matrix In an N by N square grid, each cell is either empty (0) or blocked (1). Aclear path from top-left to bottom-righthas lengthkif and only if it is composed of cellsC_1, C_2, ..., C_ksuch that:...
Given an n x n binary matrix grid, return the length of the shortest clear path in the matrix. If there is no clear path, return -1. A clear path in a binary matrix is a path from the top-left cell (i.e., (0, 0)) to the bottom-right cell (i.e., (n - 1, n - 1)...
classSolution {publicintshortestPathBinaryMatrix(int[][] grid) {intn =grid.length;if(grid[0][0] ==1|| grid[n -1][n -1] ==1)return-1; boolean[][] visited=newboolean[n][n]; Queue<int[]> q =newLinkedList<>(); q.offer(newint[] {0,0}); ...
Python调用Gurobi:Shortest Path Problem及其对偶问题的一些探讨 最短路问题(Shortest Path Problem, SPP)是一类非常经典的问题。基本的SPP不是NP-hard,可以用Dijkstra等算法在多项式时间内求解到最优解。今天我们不探讨这些求解算法,仅探讨用求解器Gurobi和Python来求解这个问题。 我们首先来看一个例子网络: SPP:有负环...
A 'Shortest Path Algorithm' refers to a computational method used in computer science to find the most efficient route between two points in a network, such as an IP network or a telephone network. It is particularly useful for applications like routing in IP networks and dynamic call routing...
classSolution{public:intshortestPathBinaryMatrix(vector<vector<int>>& grid){if(grid[0][0] ==1)return-1;intres =0, n = grid.size(); set<vector<int>> visited; visited.insert({0,0}); queue<vector<int>> q; q.push({0,0}); ...