Added Design an Ordered System.java

Author: varunu28

Easy/Design an Ordered System.java

@@ -0,0 +1,23 @@
+class OrderedStream {
+  int ptr;
+  String[] map;
+  public OrderedStream(int n) {
+    map = new String[n];
+    ptr = 0;
+  }
+
+  public List<String> insert(int id, String value) {
+    List<String> list = new ArrayList<>();
+    map[id - 1] = value;
+    while (ptr < map.length && map[ptr] != null) {
+      list.add(map[ptr++]);
+    }
+    return list;
+  }
+}
+
+/**
+ * Your OrderedStream object will be instantiated and called as such:
+ * OrderedStream obj = new OrderedStream(n);
+ * List<String> param_1 = obj.insert(id,value);
+ */