1 package Today; 2 //LeetCode:463. Island Perimeter 3 /* 4  You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. 5   Grid cells are connected horizontally/vertically (not diagonally). 6    The grid is completely surrounded by water, and there is exactly one island  7    (i.e., one or more connected land cells). The island doesn't have "lakes"  8    (water inside that isn't connected to the water around the island).  9    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.10 11 Example:12 13 [[0,1,0,0],14  [1,1,1,0],15  [0,1,0,0],16  [1,1,0,0]]17 18 Answer: 1619 Explanation: The perimeter is the 16 yellow stripes in the image below:20 21  */22 public class islandPerimeter463 {23     public static int islandPerimeter(int[][] grid) {24         int count=0;25         for(int i=0;i
     
      0&&grid[i][j-1]==1)30                         count--;31                     if(j
      
       0&&grid[i-1][j]==1)34                         count--;35                     if(i