Create 0463-island-perimeter.kt

Author: a93a

kotlin/0463-island-perimeter.kt

@@ -0,0 +1,19 @@
+class Solution {
+    fun islandPerimeter(grid: Array<IntArray>): Int {
+        if(grid.size == 0 || grid[0].size == 0)
+            return 0
+        var res = 0
+        for(i in 0..grid.size-1){
+            for(j in 0..grid[0].size-1){
+                if(grid[i][j]==1){
+                    res += 4
+                    if(i > 0 && grid[i-1][j]==1)
+                        res -= 2
+                    if(j > 0 && grid[i][j-1]==1)
+                        res -= 2
+                }
+            }
+        }
+        return res
+    }
+}