cs: add “605. Can Place Flowers”

Signed-off-by: Matej Focko <mfocko@redhat.com>

cs/can-place-flowers.cs

@@ -0,0 +1,19 @@
+public class Solution {
+    public bool CanPlaceFlowers(int[] flowerbed, int n) {
+        var count = 0;
+
+        int left = 0, right;
+        for (var i = 0; i < flowerbed.Length; ++i) {
+            right = (i + 1 < flowerbed.Length) ? flowerbed[i + 1] : 0;
+
+            if (left == 0 && flowerbed[i] == 0 && right == 0) {
+                ++count;
+                left = 1;
+            } else {
+                left = flowerbed[i];
+            }
+        }
+
+        return count >= n;
+    }
+}