标签：alt 分享 connect class problem log ide blog ges
You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely surrounded by water, and there is exactly one island (i.e., one or more connected land cells). The island doesn‘t have "lakes" (water inside that isn‘t connected to the water around the island). One cell is a square with side length 1. The grid is rectangular, width and height don‘t exceed 100. Determine the perimeter of the island.
Example:
[[0,1,0,0], [1,1,1,0], [0,1,0,0], [1,1,0,0]] Answer: 16 Explanation: The perimeter is the 16 yellow stripes in the image below:
求岛的周长，其中相邻的1和0形成一条边
1 public class Solution { 2 public int islandPerimeter(int[][] grid) { 3 int perimeter = 0; 4 for (int i = 0; i < grid.length; i++){ 5 for (int j = 0; j < grid[0].length; j++){ 6 if (i == 0 && j == 0)//第一行第一列（左上） 7 perimeter += ((grid[i][j] ^ 0) + (grid[i][j] ^ 0)); 8 else if (i == 0 && j != 0)//第一行（左上） 9 perimeter += ((grid[i][j] ^ 0) + (grid[i][j] ^ grid[i][j-1])); 10 else if (j == 0 && i != 0)//第一列（左上） 11 perimeter += ((grid[i][j] ^ grid[i-1][j]) + (grid[i][j] ^ 0)); 12 else 13 perimeter += ((grid[i][j] ^ grid[i-1][j]) + (grid[i][j] ^ grid[i][j-1])); 14 15 16 if (i == grid.length - 1)//最后一行（下） 17 perimeter += grid[i][j] ^ 0 ; 18 if (j == grid[0].length - 1)//最后一列（右） 19 perimeter += grid[i][j] ^ 0; 20 21 } 22 } 23 return perimeter; 24 } 25 }
1 public class Solution { 2 public int islandPerimeter(int[][] grid) { 3 int perimeter = 0; 4 for (int i = 0; i < grid.length; i++){ 5 for (int j = 0; j < grid[0].length; j++){ 6 if (grid[i][j] == 1){ 7 if (i == 0 || grid[i-1][j] == 0){perimeter++;}//up 8 if (j == 0 || grid[i][j-1] == 0){perimeter++;}//left 9 if (i == grid.length - 1 || grid[i+1][j] == 0){perimeter++;}//down 10 if (j == grid[0].length - 1 || grid[i][j+1] == 0){perimeter++;}//right 11 } 12 13 } 14 } 15 return perimeter; 16 } 17 }
标签：alt 分享 connect class problem log ide blog ges
原文地址：http://www.cnblogs.com/xuehaoyue/p/6403920.html
