solved: 463. Island Perimeter

Signed-off-by: rajput-hemant <rajput.hemant2001@gmail.com>

Author: rajput-hemant

src/0401-0500/463 - Island Perimeter/island_perimeter.rs

@@ -0,0 +1,22 @@
+impl Solution {
+    pub fn island_ erimeter(grid: Vec<Vec<i32>>) -> i32 {
+        let mut perimeter = 0;
+
+        for i in 0..grid.len() {
+            for j in 0..grid[i].len() {
+                if grid[i][j] == 1 {
+                    perimeter += 4;
+
+                    if i != 0 && grid[i - 1][j] == 1 {
+                        perimeter -= 2;
+                    }
+                    if j != 0 && grid[i][j - 1] == 1 {
+                        perimeter -= 2;
+                    }
+                }
+            }
+        }
+
+        perimeter
+    }
+}