diff --git a/workbook_8708/11501-s2.py b/workbook_8708/11501-s2.py
new file mode 100644
index 0000000..ac907b3
--- /dev/null
+++ b/workbook_8708/11501-s2.py
@@ -0,0 +1,62 @@
+# 주식
+
+import sys
+from collections import deque
+
+input = sys.stdin.readline
+
+
+def calculate_revenue(n, prices):
+    total = 0
+    q = deque([prices[0]])
+    up = 0
+    if prices[0] <= prices[1]:
+        up = 1
+    else:
+        up = 0
+
+    for i in range(1, n):
+        if len(q) != 0 and i == n-1 and prices[i] >= q[-1]:
+            high = q.pop() if i != n-1 else prices[i]
+            while len(q) >= 1 and q[0] > high:
+                q.popleft()
+            while len(q) >= 1:
+                total += (high-q.pop())
+
+        if not up:
+            if len(q) != 0 and prices[i] > q[-1]:
+                up = 1
+            q.append(prices[i])
+            continue
+
+        if len(q) != 0 and (prices[i] < q[-1] or i == n-1):
+            high = q.pop() if i != n-1 else prices[i]
+            while len(q) >= 1 and q[0] > high:
+                q.popleft()
+            while len(q) >= 1:
+                total += (high-q.pop())
+            up = 0
+        q.append(prices[i])
+
+    return total
+
+def solution():
+    t = int(input().rstrip())
+
+    for _ in range(t):
+        n = int(input().rstrip())
+        prices = list(map(int, input().rstrip().split()))
+        print(calculate_revenue(n, prices))
+
+    return
+
+
+solution()
+
+"""
+걸린 시간: 
+
+시간 복잡도: 
+
+해설: 
+"""
\ No newline at end of file