diff --git a/src/main/java/review/leetcode901.java b/src/main/java/review/leetcode901.java
new file mode 100644
index 0000000..0162e38
--- /dev/null
+++ b/src/main/java/review/leetcode901.java
@@ -0,0 +1,31 @@
+package review;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+public class leetcode901 {
+    class StockSpanner {
+
+        Deque<int[]> stack;
+        int counter;
+
+        public StockSpanner() {
+            stack = new ArrayDeque<>();
+            counter = -1;
+        }
+
+        public int next(int price) {
+            counter++;
+            while (!stack.isEmpty() && stack.peek()[1] <= price) {
+                int[] top = stack.pop();
+            }
+            int tmp = -1;
+            if (!stack.isEmpty()) {
+                tmp = stack.peek()[0];
+            }
+
+            stack.push(new int[]{counter, price});
+            return counter - tmp;
+        }
+    }
+}