Create 463. Island Perimeter.java

Author: futurus

463. Island Perimeter.java

@@ -0,0 +1,29 @@
+public class Solution {
+    public int islandPerimeter(int[][] grid) {
+        int perimeter = 0;
+        
+        for (int row = 0; row < grid.length; row++) {
+            for (int col = 0; col < grid[row].length; col++) {
+                if (grid[row][col] == 1) {
+                    int nAdj = 0;
+                    
+                    if (row == 0 || grid[row-1][col] == 0) 
+                        nAdj++;
+                    
+                    if (col == 0 || grid[row][col-1] == 0) 
+                        nAdj++;
+                    
+                    if (row == grid.length - 1 || grid[row+1][col] == 0) 
+                        nAdj++;
+                    
+                    if (col == grid[row].length - 1 || grid[row][col+1] == 0) 
+                        nAdj++;
+                        
+                    perimeter += nAdj;
+                }
+            }
+        }
+        
+        return perimeter;
+    }
+}