Create 0071-simplify-path.kt

Author: a93a

kotlin/0071-simplify-path.kt

@@ -0,0 +1,21 @@
+class Solution {
+    fun simplifyPath(path: String): String {
+        val stack = LinkedList<String>()
+        val invalids = hashSetOf("", ".", "..")
+
+        path.split("/").forEach{
+            if(it == ".." && stack.isNotEmpty()) {
+                stack.removeLast()
+            } else if (it !in invalids) {
+                stack.addLast(it)
+            } 
+        }
+
+        return if(stack.isEmpty()) "/" else StringBuilder().apply{
+            while (stack.isNotEmpty()) {
+                this.append("/")
+                this.append(stack.removeFirst())
+            }
+        }.toString()
+    }
+}