Create 0705-design-hashset.kt

Author: a93a

Diff for: kotlin/0705-design-hashset.kt

@@ -0,0 +1,43 @@
+class MyHashSet() {
+
+    class LN(val value: Int) {
+        var next: LN? = null
+    }
+    
+    val set = Array (10000) { LN(0) }
+
+    fun add(key: Int) {
+        var cur = set[hash(key)]
+        while (cur?.next != null) {
+            if (cur?.next?.value == key)
+                return
+            cur = cur?.next!!
+        }
+        cur.next = LN(key)
+    }
+
+    fun remove(key: Int) {
+        var cur = set[hash(key)]
+        while (cur?.next != null) {
+            if (cur?.next?.value == key) {
+                cur?.next = cur?.next?.next
+                return
+            }
+            cur = cur?.next!!
+        }
+    }
+
+    fun contains(key: Int): Boolean {
+        var cur = set[hash(key)]
+        while (cur?.next != null) {
+            if (cur?.next?.value == key) {
+                return true
+            }
+            cur = cur?.next!!
+        }
+        return false
+    }
+    
+    private fun hash(key: Int) = key % set.size
+
+}