(#463)IslandPerimeter

Author: FeiCoding

(#463)IslandPerimeter/IslandPerimeter.java

@@ -0,0 +1,17 @@
+class Solution {
+    public int islandPerimeter(int[][] grid) {
+        int island = 0;
+        int neighbour = 0;
+        for(int i = 0; i < grid.length; i ++){
+            for(int j = 0; j < grid[i].length; j ++){
+                if(grid[i][j] == 1) 
+                {
+                    island ++;
+                    if(j + 1 < grid[i].length && grid[i][j + 1] == 1) neighbour ++;
+                    if(i + 1 < grid.length && grid[i + 1][j] == 1) neighbour++;
+                }
+            }
+        }
+        return island * 4 - neighbour * 2;
+    }
+}